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GAS DETECTOR [70 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 - external organization data 2021-03-18

English

Subject field(s)
  • Compartment – Nomenclature 4.0
  • Museums and Heritage (General)
OBS

gas detector : an item in the "Regulative and Protective Tools and Equipment" class of the "Tools and Equipment for Science and Technology" category.

French

Domaine(s)
  • Tiroir – Nomenclature 4.0
  • Muséologie et patrimoine (Généralités)
OBS

explosimètre : objet de la classe «Dispositifs de protection» de la catégorie «Outillage et équipement pour les sciences et la technologie».

Spanish

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Record 2 2017-02-14

English

Subject field(s)
  • Analytical Chemistry
DEF

A device for converting physical or chemical properties of substances to an analytical signal (digit, curve, colour, deflection of the recorder).

OBS

Differential detectors produce a chart record consisting of a series of peaks; integral detectors produce a record which is a series of steps. Universal detectors respond to all or most compounds; selective detectors respond to a group of compounds or a number of species; specific detectors respond to a very limited class of compounds. In all cases a linear response to concentration is desirable.

OBS

To classify detectors, many terms have been introduced; these are based either on (1) the manner in which their output signals are recorded (yielding either integral or differential chromatograms), (2) their modes of operation, (3) monitoring some selective or specific physical property of a compound, or (4) their reactivity with the eluted molecule (destructive or nondestructive).

PHR

Detector calibration, chamber, lid.

PHR

Gas chromatographic ozone-chemiluminescence detector.

French

Domaine(s)
  • Chimie analytique
CONT

Les détecteurs permettent de visualiser la séparation, voire d'améliorer la sélectivité dans le cas où celle du système chromatographique est insuffisante et, pour les plus performants d'entre eux, d'apporter des informations quant à l'unicité des pics chromatographiques ou encore l'identification des solutés.

OBS

Détecteurs. On peut [...] les classer soit selon leur principe de mesure, soit selon le degré d'information qu'ils peuvent apporter. Dans le premier classement, on distingue les détecteurs mettant en œuvre une propriété spécifique du soluté (détection directe), une propriété spécifique d'un des constituants de l'éluant (détection indirecte) ou une différence de propriété entre le soluté et la phase éluante provoquant des variations au niveau de l'effluent (détection différentielle). [...] Dans le second classement, on les regroupe en trois catégories : détecteurs simples, [...] détecteurs semi-informatifs, [...] détecteurs intelligents.

PHR

Étalonner, monter en opposition, monter (un, des) détecteur(s) en série.

PHR

Le détecteur permet le repérage.

PHR

Bloc, cellule, domaine de linéarité, enceinte, étalonnage, saturation d'un détecteur.

PHR

Détecteur sélectif, ultrasensible.

Spanish

Campo(s) temático(s)
  • Química analítica
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Record 3 2016-11-23

English

Subject field(s)
  • Scientific Instruments
  • Radiological Physics (Theory and Application)
  • Electromagnetic Radiation
DEF

A radiation-counter tube in which an appropriate atmosphere is maintained by a flow of gas through the tube.

OBS

gas flow detector : term extracted from the “Glossaire de l'énergie nucléaire” and reproduced with permission of the Organisation for Economic Co-operation and Development.

French

Domaine(s)
  • Instruments scientifiques
  • Physique radiologique et applications
  • Rayonnements électromagnétiques
DEF

Tube-compteur de rayonnement dans lequel une atmosphère appropriée est maintenue par circulation lente d'un gaz dans l'enceinte.

OBS

détecteur à circulation de gaz : terme extrait du «Glossaire de l’énergie nucléaire» et reproduit avec l’autorisation de l’Organisation de coopération et de développement économiques.

Spanish

Campo(s) temático(s)
  • Instrumentos científicos
  • Física radiológica (Teoría y aplicación)
  • Radiación electromagnética
Save record 3

Record 4 2016-07-20

English

Subject field(s)
  • Scientific Instruments
  • Electrochemistry
DEF

A detector consisting of an electrochemical cell that responds to certain substances contained in the carrier gas eluting from the column.

OBS

The electrochemical process can be an oxidation, a reduction or a change in conductivity. The detection can be very specific depending on the electrochemical process involved.

OBS

electrochemical detector; ED: term, abbreviation and definition standardized by ISO in 2014.

Key term(s)
  • electro-chemical detector
  • electrochemic detector

French

Domaine(s)
  • Instruments scientifiques
  • Électrochimie
DEF

Détecteur comportant une cellule électrochimique qui répond à certaines substances contenues dans le gaz vecteur élué de la colonne.

OBS

Le processus électrochimique peut être une oxydation, une réduction ou une variation de conductivité. La détection peut être très spécifique selon le processus mis en œuvre.

OBS

On peut classer les détecteurs électrochimiques en deux catégories : les détecteurs coulométriques et les détecteurs ampérométriques.

OBS

détecteur électrochimique : terme et définition normalisés par l'ISO en 2014.

Key term(s)
  • détecteur électro-chimique

Spanish

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Record 5 2016-07-13

English

Subject field(s)
  • Scientific Instruments
  • Analytical Chemistry
DEF

A detector that uses a reducing flame in which individual elements give rise to characteristic colours that are measured by a photomultiplier.

CONT

The flame photometric detector (FPD) measures the fluorescence emission of hetero atoms of organic molecules subjected to combustion.

OBS

The detector is used in gas chromatography mainly to detect components that contain particular elements, e. g. phosphorous(P) and sulfur(S).

OBS

flame photometric detector: term and definition standardized by ISO in 2014.

PHR

continuous flame photometric detector, pulsed flame photometric detector

French

Domaine(s)
  • Instruments scientifiques
  • Chimie analytique
DEF

Détecteur utilisant une flamme réductrice dans laquelle les éléments émettent une couleur caractéristique qui est mesurée par un photomultiplicateur.

OBS

Le détecteur est utilisé en chromatographie en phase gazeuse pour détecter plus particulièrement les constituants renfermant des éléments particuliers, comme par exemple, le phosphore (P) et le soufre (S).

OBS

détecteur à photométrie de flamme : terme et définition normalisés par l'ISO en 2014.

PHR

détecteur à photométrie de flamme pulsée, détecteur à photométrie de flamme soufre-phosphore

Spanish

Campo(s) temático(s)
  • Instrumentos científicos
  • Química analítica
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Record 6 2016-06-27

English

Subject field(s)
  • Scientific Instruments
  • Analytical Chemistry
DEF

A detector in which hydrocarbons are burned in a hydrogen-air flame and the electrical current caused by the resulting ions is measured between two electrodes. [Definition standardized by ISO in 2014.]

DEF

A hydrogen-air diffusion flame detector that produces a signal nominally proportional to the mass-flow rate of hydrocarbons entering the flame per unit of time - generally assumed responsive to the number of carbon atoms entering the flame. [Definition officially approved by ICAO.]

OBS

The flame ionization detector is used in gas chromatography mainly to detect hydrocarbon compounds.

OBS

flame ionization detector; FID: term and abbreviation standardized by ISO in 2014.

OBS

flame ionization detector; FI-detector: terms extracted from the "Disarmament and Peace Keeping" glossary with the permission of the United Nations Office at Geneva.

OBS

flame ionization detector; FID: term and abbreviation officially approved by the International Civil Aviation Organization (ICAO).

Key term(s)
  • flame ionisation detector

French

Domaine(s)
  • Instruments scientifiques
  • Chimie analytique
DEF

Détecteur dans lequel les ions résultant de la combustion des hydrocarbures dans une flamme air/hydrogène sont mesurés électriquement entre deux électrodes.

OBS

Le détecteur à ionisation de flamme est utilisé en chromatographie en phase gazeuse pour détecter plus particulièrement les composés hydrocarbonés.

OBS

détecteur à ionisation de flamme; FID : terme, abréviation et définition normalisés par l'ISO en 2014.

OBS

détecteur à ionisation de flamme; détecteur FI : termes tirés du lexique «Désarmement et Maintien de la Paix» avec l'autorisation de l'Office des Nations Unies à Genève.

OBS

détecteur à ionisation de flamme : terme uniformisé par l'Organisation de l'aviation civile internationale (OACI).

Spanish

Campo(s) temático(s)
  • Instrumentos científicos
  • Química analítica
DEF

Dispositivo en el que el cambio medido de la conductividad de una llama patrón (generalmente de hidrógeno) debido a la introducción de otro gas o vapor, se utiliza para detectar dicho gas o vapor.

CONT

El detector de ionización de llama (Abreviadamente DILL) es otro de los detectores más populares y sensibles. Su detectabilidad puede ser unas mil veces más baja que el de conductividad térmica.

OBS

detector de ionización de la llama; detector de la ionización de la llama; FID: término y abreviatura aceptados oficialmente por la Organización de Aviación Civil Internacional (OACI).

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Record 7 2016-05-02

English

Subject field(s)
  • Scientific Instruments
  • Conductivity and Superconductivity (Electricity)
  • Analytical Chemistry
DEF

A detector that measures the difference in thermal conductivity between two gas streams when a sample(gas mixture) passes through the sample channel.

OBS

[It] is a dual channel detector, requiring a reference flow of pure carrier gas through the reference channel.

OBS

The detector consists of a bridge circuit; the change in resistance in the sample channel during the passage of the sample produces an out-of-balance signal that is the basis of the detection. The detector responds to all components except the carrier gas and it is non-destructive.

OBS

thermal conductivity detector; hot wire detector: terms and definition standardized by ISO in 2014.

French

Domaine(s)
  • Instruments scientifiques
  • Conductivité et supraconductivité (Électricité)
  • Chimie analytique
DEF

Détecteur qui mesure la différence de conductivité thermique entre deux courants de gaz dont l’un (le mélange de gaz échantillon) passe par la voie d’échantillonnage.

OBS

[Il s'agit d']un détecteur à deux voies dont l’une, dite voie de référence, est réservée au flux de référence du gaz vecteur.

OBS

Le détecteur se compose d’un circuit en pont. La variation de résistance dans le canal d’échantillonnage pendant le passage de l’échantillon produit un déséquilibre du signal qui constitue le point de départ de la détection. Le détecteur, qui est non-destructif, répond à tous les constituants excepté le gaz vecteur.

OBS

détecteur à conductibilité thermique; détecteur à filament chaud : termes et définition normalisés par l'ISO en 2014.

Spanish

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Record 8 2016-03-30

English

Subject field(s)
  • Scientific Instruments
  • Scientific Measurements and Analyses
DEF

A complete set of measuring instruments and other equipment assembled to carry out specified measurements.

OBS

Examples: a) apparatus for measuring the conductivity of semiconductor materials; b) apparatus for the calibration of clinical thermometers.

OBS

[In the natural gas industry, it comprises], in general, a sample transfer and introduction unit, a separation unit, a detector and an integrator or a data processing system.

OBS

The Vocabulary of Legal Metrology (VML) term "(measuring) instrument system" should no longer be used in order to avoid any confusion with International Vocabulary of Basic and General Terms in Metrology (VIM) term "measuring system."

OBS

measuring system: term and definition standardized by ISO in 2014.

French

Domaine(s)
  • Instruments scientifiques
  • Mesures et analyse (Sciences)
DEF

Ensemble complet d’instruments de mesurage et d’autres équipements assemblés pour effectuer les mesurages spécifiés.

OBS

Exemples : a) appareillage pour mesurer la conductivité des matériaux semiconducteurs; b) appareillage pour l'étalonnage des thermomètres médicaux.

OBS

[Dans l'industrie du gaz naturel, cet ensemble comprend] généralement une unité d’introduction et de transfert de l’échantillon, une unité de séparation, un détecteur et un intégrateur ou système de traitement des données.

OBS

Le terme du Vocabulaire de métrologie légale «système d'un instrument de mesurage» ne doit plus être utilisé pour éviter toute confusion avec le terme du Vocabulaire international des termes fondamentaux et généraux en métrologie «système de mesure».

OBS

chaîne de mesurage : terme et définition normalisés par l'ISO en 2014.

OBS

système de mesure : terme normalisé par l'AFNOR.

Spanish

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Record 9 2016-03-30

English

Subject field(s)
  • Scientific Instruments
  • Analytical Chemistry
DEF

A detector that uses a reducing reaction in which molecules give rise to characteristic luminous emissions that are measured by a photomultiplier and the associated electronic devices.

OBS

A chemiluminescence detector is used in gas chromatography mainly to detect components that contain particular elements, e. g. nitrogen(N) and sulfur(S).

OBS

chemiluminescence detector: term and definition standardized by ISO in 2014.

French

Domaine(s)
  • Instruments scientifiques
  • Chimie analytique
DEF

Détecteur qui utilise une réaction de réduction dans laquelle des molécules émettent des rayons lumineux caractéristiques que mesurent un photomultiplicateur et les dispositifs électroniques associés.

OBS

Le détecteur à chimiluminescence est utilisé en chromatographie en phase gazeuse principalement pour détecter des constituants contenant des éléments particuliers, comme par exemple, l’azote (N) et le soufre (S).

OBS

détecteur à chimiluminescence : terme et définition normalisés par l'ISO en 2014.

Spanish

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Record 10 2014-11-24

English

Subject field(s)
  • Security
  • Security Devices
  • Electronics
CONT

Semi-conductors are usually mixtures of oxydes which have been "doped" by small concentrations of certain elements, usually a rare earth. Their electrical conductivity when heated(by a platinum-rhodium wire) is altered appreciably by the presence of small concentrations of flammable and certain toxic gases.... The resistance of a semi-conductor gas detector is measured by small electrodes...

French

Domaine(s)
  • Sécurité
  • Dispositifs de sécurité
  • Électronique
CONT

La RTC vient de lancer sous le nom de Gazistance un composant destiné à la détection des gaz inflammables. Elle met en œuvre pour cela des céramiques semiconductrices (des oxydes ferriques, d'étain et de zinc) dont la variation de résistivité est fonction de la concentration de gaz ou de vapeurs dans l'air ambiant.

Spanish

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Record 11 2012-01-16

English

Subject field(s)
  • Analytical Chemistry
  • Phraseology
  • Electrical Engineering
OBS

... Winefordner et al. described a special, more sensitive cell based on changes in dielectric constant and constructed to allow gas flow between the plates of a capacitor which is a part of the tank circuit of a 70-Mc/sec Clapp oscillator, the output of which is beat against that of a reference oscillator. With the difference frequency between oscillators adjusted to zero with pure carrier gas flowing through the detector, the presence of a foreign vapor in the cell will produce a different frequency which is linearly related to the amount of material introduced through an injection port in the carrier gas stream and inversely proportional to the absolute temperature for a given component at a constant density or concentration in the cell and for a particular operating frequency.

PHR

Reference, sample Clapp oscillator.

French

Domaine(s)
  • Chimie analytique
  • Phraséologie
  • Électrotechnique

Spanish

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Record 12 2012-01-16

English

Subject field(s)
  • Analytical Chemistry
  • Phraseology
CONT

Dudenbostel and Priestley described an automatic process gas analyzer for propane in propylene using a simple detector...

PHR

Automatic process gas analyzer.

French

Domaine(s)
  • Chimie analytique
  • Phraséologie

Spanish

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Record 13 2011-11-14

English

Subject field(s)
  • Scientific Instruments
  • Analytical Chemistry
OBS

A type of ionization detector that responds to the permanent gases. It consists of a small ionization chamber in which the carrier gas and solute are irradiated with electron from a β-ray emitter while a potential is applied across the cell. When solutes enter the chamber there is a current change arising from the change in total cross-section for ionization.

OBS

The carrier gas most commonly used is hydrogen but nitrogen and helium are also employed.

French

Domaine(s)
  • Instruments scientifiques
  • Chimie analytique

Spanish

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Record 14 2011-09-26

English

Subject field(s)
  • Radiological Physics (Theory and Application)
  • Scientific Instruments
CONT

A Geiger-Mueller(GM) tube is a gas-filled radiation detector. It commonly takes the form of a cylindrical outer shell(cathode) and the sealed gas-filled space with a thin central wire(the anode) held at [approximately] 1 kV [kilovolt] positive voltage with respect to the cathode. The fill gas is generally argon at a pressure of less than 0. 1 atm [atmosphere] plus a small quantity of a quenching vapor …

French

Domaine(s)
  • Physique radiologique et applications
  • Instruments scientifiques
CONT

[Détection et mesures des rayonnements nucléaires.] Gaz de remplissage : son choix est important puisque le développement de l’avalanche dépend largement de la dérive des électrons primaires. Toute trace d’oxygène doit être proscrite et on utilise le plus souvent un gaz rare (comme Ar [argon] ou Kr [krypton] ou Xe [xénon]) pour augmenter l’efficacité s’il s’agit de détecter des photons. Pour la détection des neutrons, on utilise d’autres gaz moins classiques. Ce gaz est souvent enfermé dans une enceinte scellée (emploi plus commode) ou peut être recyclé en permanence dans le compteur (dans la détection des particules chargées en particulier).

Spanish

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Record 15 2011-07-12

English

Subject field(s)
  • Analytical Chemistry
DEF

A detector that responds to changes in either the dielectric constant of a radio-frequency plasma or the potential difference between capacitor plates arising from variations in the composition of the carrier gas as solutes are eluted from the gas chromatography [GC] column.

French

Domaine(s)
  • Chimie analytique

Spanish

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Record 16 2011-07-12

English

Subject field(s)
  • Analytical Chemistry
DEF

A detector in which eluates from GC [gas chromatography] are directly weighed on a microbalance.

OBS

A small cylindrical chamber, containing active charcoal, is attached to the microbalance on to which the eluate is adsorbed. The response is a function of the weight of the material adsorbed by the charcoal, the device acting as an integral detector.

French

Domaine(s)
  • Chimie analytique
PHR

Détecteur de masse à piégeage d'ions.

Spanish

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Record 17 2011-06-23

English

Subject field(s)
  • Chemistry
  • Applications of Electronics
DEF

A detector which uses low-energy electrons from either a tritium or Ni source, to ionize the carrier gas in an ionization chamber, at a potential just strong enough for the collection of all the free electrons produced.

OBS

electron capture detector; ECD: term and abbreviation extracted from the "Disarmament and Peace Keeping" glossary with the permission of the United Nations Office at Geneva.

Key term(s)
  • EC detector

French

Domaine(s)
  • Chimie
  • Applications de l'électronique
DEF

Détecteur utilisé en chromatographie gazeuse; les composés ayant un groupement électro-négatif ont tendance à capturer les électrons pour former des ions négatifs lorsqu'ils sont exposés à une source d'électrons de faible énergie; les ions négatifs sont entraînés dans le gaz vecteur, puis sont détectés par la réduction de courant qu'ils provoquent sur une électrode.

OBS

détecteur à capture d'électrons; DCE : terme et abréviation tirés du lexique «Désarmement et Maintien de la Paix» avec l'autorisation de l'Office des Nations Unies à Genève.

Spanish

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Record 18 2011-06-23

English

Subject field(s)
  • Analytical Chemistry
DEF

A detector in which organic material eluted from a GC [gas chromatography] column is combusted in excess oxygen.

French

Domaine(s)
  • Chimie analytique
CONT

[...] un détecteur à conductibilité électrolytique pour déterminer les molécules isotopiques de l'hydrogène [...]

Spanish

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Record 19 2011-05-17

English

Subject field(s)
  • Scientific Instruments
  • Analytical Chemistry
  • Atomic Physics
DEF

[A] family of related detectors [which] is based upon changes in the conductivity of electricity through gases arising as a result of the presence of charged particles and ions in the gas. These ions may be created by combustion(as in the flame ionization detector), transfer of energy(in the argon detector), or by ß ionization(in the cross-section and electron capture detectors).

OBS

The first detector of this series that was developed was the cross-section detector although the most widely used is the flame ionization detector. Their great popularity rests in their wide applicability and high sensitivity.

French

Domaine(s)
  • Instruments scientifiques
  • Chimie analytique
  • Physique atomique
DEF

Détecteur de rayonnement qui utilise l'ionisation dans son volume utile.

Spanish

Campo(s) temático(s)
  • Instrumentos científicos
  • Química analítica
  • Física atómica
OBS

Para la cromatografía de fase gaseosa.

Save record 19

Record 20 2011-04-06

English

Subject field(s)
  • Radiological Physics (Theory and Application)
CONT

A … thin-walled dual-type gridded ionization chamber gamma radiation detector using ultra pure Xe gas as the detection medium.

French

Domaine(s)
  • Physique radiologique et applications
CONT

La chambre d’ionisation est l’un des détecteurs les plus simples et des plus anciens. Le milieu détecteur est un gaz. Deux électrodes servent à appliquer un champ électrique dans l’enceinte du détecteur pour assurer le collectage des charges créées lors du passage d’une particule ionisante.

Spanish

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Record 21 2011-04-04

English

Subject field(s)
  • Analytical Chemistry
CONT

An instrument which responds to density changes in the gas stream, directly related to the molecular weights. Several forms of gas density balance have been developed since this type of detector was first introduced by Martin and James. Improvements in instrumentation have led to a revival of interest in it as a detector system suitable for molecular-weight studies. The density changes are measured by means of a form of U-tube, one limb of which contains pure carrier gas and the other column effluent gas. An anemometer situated between the two limbs detects and measures any density difference. Using nitrogen or argon carrier gas the limit of detection is 0. 4 μg, response is linear with concentration, and it can be used for molecular weight determinations for values below 200 and for percentage composition studies.

Key term(s)
  • James Martin gas density balance

French

Domaine(s)
  • Chimie analytique
CONT

La balance à densité gazeuse est un des premiers détecteurs utilisés en chromatographie en phase gazeuse [....] Le gaz de référence [...] est divisé en deux flux et passe sur les éléments chauffants placés dans un pont de Wheatstone. Le gaz vecteur sortant de la colonne entre dans le détecteur [...] puis se divise également en deux flux. La sortie est commune. S'il ne sort de la colonne que le gaz vecteur pur, les débits dans les branches sont identiques [....] Le pont de Wheatstone est équilibré. Lorsqu'un soluté est élué de la colonne, et si sa densité est différente de cette du gaz vecteur [...], [il] en résulte une variation des débits qui se traduit par une variation de la température des filaments et donc par un déséquilibre du pont de Wheatstone. La réponse du détecteur est proportionnelle à la variation de la densité du gaz vecteur induite par la présence du soluté.

OBS

Peu sensible (du même ordre que le catharomètre à filaments), la balance à densité gazeuse a l'avantage d'être un détecteur universel, non destructif, et d'être le seul détecteur dont la réponse puisse être calculée rigoureusement à partir des formules chimiques des solutés qui le traversent. Pour ces raisons, elle a son utilité dans les analyses industrielles en ligne.

Spanish

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Record 22 2011-01-06

English

Subject field(s)
  • Analytical Chemistry
CONT

In contrast to the automatic recording instruments monitoring volume increases at constant pressure, van de Craats maintained the volume constant and recorded automatically the pressure changes by means of an electromagnetic manometer devised by Kinkel.... In addition to van de Craats’ work with pressure-sensing devices, Novák and Janák constructed a detector which represents the pneumatic analog of a Wheatstone bridge, employing the dynamic effects of pneumatic obstructions such as capillaries and constrictions for determining component fractions emerging from the gas chromatographic column. Requiring no electrical power yet having an accuracy comparable to high precision thermal conductivity cells, it expresses the pressure differential, either differentially or integrally, caused by the eluted component as a diagonal from zero. Furthermore, the substance analyzed is never in contact with the detector.

French

Domaine(s)
  • Chimie analytique

Spanish

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Record 23 2010-12-23

English

Subject field(s)
  • Biological Sciences
  • Analytical Chemistry
DEF

Instrument used to monitor and quantify the products eluted from a chromatography column. Techniques used are based on the physical, chemical or biological properties of the molecules and may involve prior conversion by chemical or enzymic means to produce a coloured or fluorescent complex. Physical methods include the use of spectrophotometers, colorimeters, spectrophotofluorometers, refractometers, polarimeters, etc.

CONT

Biological molecules may be monitored using enzyme-linked reactions specific for the required class of compound. Such detectors often include a flow cell so that the fluid passes continuously from the column through the detector. Several types of detector have been developed specifically for use with gas/liquid chromatographs. These include flame ionization and electron capture devices or, where information is required on the exact structure of the compounds, a mass spectrometer. Many are linked to microprocessors for control of the chromatographic analysis, as well as direct computation of results.

French

Domaine(s)
  • Sciences biologiques
  • Chimie analytique
DEF

Appareil servant à déceler, à révéler la présence d'un corps dans un échantillon.

CONT

Les détecteurs en chromatographie [...] mettent en évidence les constituants du mélange. Un bon détecteur doit être stable, sensible, linéaire, pratique d'emploi et ne doit pas altérer les séparations réalisées par la colonne.

Spanish

Campo(s) temático(s)
  • Ciencias biológicas
  • Química analítica
Save record 23

Record 24 2009-06-08

English

Subject field(s)
  • Measuring Instruments
  • Scientific Measurements and Analyses
  • Nuclear Power Stations
CONT

A spark-plug type leak detector was located in the backup gas chamber to sense any extrusion of sodium from the seal. AN-fitting was installed in the body of the gas chamber to facilitate clean-up operations in the event of sodium leakage.

French

Domaine(s)
  • Appareils de mesure
  • Mesures et analyse (Sciences)
  • Centrales nucléaires
CONT

Détection et localisation des fuites sodium. Les moyens de détection locale font appel à des dispositifs électriques qui exploitent la bonne conductibilité du sodium. Ils sont placés sur ou au voisinage immédiat des structures à surveiller avec une certaine distribution spatiale. Tous ces détecteurs sont constitués d'une électrode métallique isolée électriquement d'une autre partie métallique très proche, portée au potentiel de terre. [...] Suivant ce principe existent : - les détecteurs par bougies [...] sur les appareils, dans les bacs de rétention ou dans des gouttières placées sous les tuyauteries; - les détecteurs de type sandwich [...]

Spanish

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Record 25 2008-11-18

English

Subject field(s)
  • Gas Industry
  • Radiological Physics (Theory and Application)
CONT

The radiation is measured by measuring the number of pulses per time unit coming from the tube, which is proportional to the intensity of the radiation to be measured. The quenching gas in the radiation detector tubes is quenching after the elapse of a certain period of time the ionic current. This time is called the dead time of the G-M tube, during which the tube is unable to react to a possibly, arriving new quantum of radiation.

French

Domaine(s)
  • Industrie du gaz
  • Physique radiologique et applications
DEF

Élément constitutif du mélange gazeux destiné au remplissage d'un tube compteur de Geiger-Müller, qui accélère l'auto-excitation de la décharge.

Spanish

Save record 25

Record 26 2008-10-20

English

Subject field(s)
  • Scientific Instruments
  • Atomic Physics
  • Radiation Protection
CONT

To detect the alpha particles only, a spark detector is used because it is insensitive to the y and x-rays also given off by the Am source. The detector consists of a course grating of fine wires in close proximity(=1 mm) to a ground plane. The principle of operation is identical to a Geiger-Müller counter(ionization detector) except that the gas(air) is at atmospheric pressure.

French

Domaine(s)
  • Instruments scientifiques
  • Physique atomique
  • Radioprotection

Spanish

Save record 26

Record 27 2007-09-13

English

Subject field(s)
  • Burners and Steamfitting
  • Gas and Oil Heating
DEF

A combination gas pilot burner and flame rod flame detector; may also include an ignition electrode for spark ignition of the pilot, or a thermocouple adapter.

CONT

A pilot burner assembly comprises a pilot burner, a flame responsive means, and an electrode, all attached in close relationship to a common mounting bracket. The electrode is frictionally attached co-axially with an insulating sleeve and the sleeve is frictionally attached to the mounting bracket so that the spark gap between the tip of the electrode and a portion of the pilot burner is adjustable without having to bend the electrode.

French

Domaine(s)
  • Fumisterie et brûleurs
  • Chauffage au gaz et au mazout
CONT

Le commutateur vérification-marche est situé au-dessus du module programmateur EP113 [...] et on peut l'utiliser pour arrêter la commande n'importe quand lors de sa séquence d'allumage sauf pendant MTFI (essai d'allumage du brûleur principal). [...] Ce commutateur facilite le réglage initial et la modification des réglages des tringleries du brûleur, de l'ensemble veilleuse, etc.

Spanish

Save record 27

Record 28 2006-04-06

English

Subject field(s)
  • Analytical Chemistry
DEF

A non-destructive detector which measures the frequency of a beat between two opposing ultrasonic vibrations placed at the outlets of a reference gas flow and the column gas flow respectively; the changes in frequency arising when solutes are eluted with the column gas stream are converted into a series of impulses corresponding to the solute concentrations.

French

Domaine(s)
  • Chimie analytique
OBS

ultrasonique : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2006).

Spanish

Save record 28

Record 29 2006-02-21

English

Subject field(s)
  • Analytical Chemistry
CONT

Piezoelectric Sorption Detector. Piezoelectric quartz crystal, long used as frequency and time standards to one part in 108 or better, have been shown by King to be selective gas detectors when coated with various chromatographic liquid phases. Used as detectors, such coated crystals have several advantages :(1) sensitivity increases with solute or sample boiling point,(2) detectors selective to compound type can be made with response times of the order of 0. 05 sec, and(3) the output signal is a frequency which simplifies integration of peak areas and digital presentation of data.

Key term(s)
  • piezo-electric sorption detector

French

Domaine(s)
  • Chimie analytique
OBS

piézoélectrique : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2004).

Key term(s)
  • détecteur piézo-électrique

Spanish

Save record 29

Record 30 2004-07-14

English

Subject field(s)
  • Analytical Chemistry
CONT

A sensitive flame ionization detector was developed for capillary column gas chromatography. The detector used no make-up gas and lower flow-rates of hydrogen and air to suppress detector noise and to achieve maximum response. The detector was responsive down to the 10 SUP-SUP 1 SUP 3 g level for C SUB 2-C SUB 1 SUB 1 hydrocarbons. Atmospheric hydrocarbons could be determined at parts per billion or parts per trillion levels by using gas chromatography with the detector via cryogenic concentration of a small volume of air sample.(Pascal Data Base).

French

Domaine(s)
  • Chimie analytique
CONT

chromatographie à ionisation de flamme

OBS

Couplage de la chromatographie en phase dioxyde de carbone supercritique sur colonnes remplies avec la détection a ionisation de flamme. Applications à l'analyse des produits pétroliers. (Base de données Pascal).

Spanish

Campo(s) temático(s)
  • Química analítica
DEF

[Se díce de los instrumentos que determinan el grado de] contaminantes basados en la medida de los iones que se forman en un proceso de combustión de hidrógeno cuando se introduce un contaminante.

Save record 30

Record 31 2003-05-15

English

Subject field(s)
  • Fire Warning Devices
CONT

A fire-gas detector can be designed to be sensitive only to the gases produced by specific types of hostile fires.

CONT

[The fire-gas detector] uses either semiconductors or catalytic elements to sense the gas and trigger the alarm. This type of detector will initiate an alarm signal somewhat faster than a heat detector but not as quickly as a smoke detector.

French

Domaine(s)
  • Alarme-incendie
CONT

[Le détecteur de gaz de combustion] utilise des semiconducteurs ou des éléments catalytiques pour détecter le gaz et déclencher l'alarme.

CONT

Un détecteur de gaz de combustion peut être réglé pour ne détecter que les gaz libérés par un type précis d'incendie et ne pas tenir compte des gaz libérés par une combustion normale. Ce type de détecteur déclenche un signal d'alarme plus rapidement qu'un détecteur thermique, mais moins rapidement qu'un détecteur de fumée.

Spanish

Save record 31

Record 32 2003-02-26

English

Subject field(s)
  • Scientific Instruments
  • Atomic Physics
CONT

The Transition Radiation Detector... consists of six polyethylene fiber radiator blankets, each with a multi-wire proportional chamber MWPC(filled with a Xenon-methane gas mixture) attached underneath. When a charged particle travels through an interface between materials of different dielectric constants, radiation(in the form of X-rays) is generated with an intensity proportional to the relativistic Lorentz factor gamma of the particle.

French

Domaine(s)
  • Instruments scientifiques
  • Physique atomique

Spanish

Save record 32

Record 33 2002-02-28

English

Subject field(s)
  • Scientific Instruments
  • Recording and Control Instrumentation
  • Security Devices
  • Air Pollution
CONT

If you have a concern about your ability to detect gas leaks, a gas detector can be an important tool to help protect you and your family.

OBS

Do not confuse the three terms "detector", "sensor" and "monitor." A detector (in French: "détecteur") is used to detect the presence of anything liable to escape observation, to indicate any deviation from normal conditions, or the like; a sensor (in French: "capteur") gives a signal for the detection or measurement of a physical property to which it responds, it is a part of a detector; a monitor (in French: "appareil de surveillance en continu") measures or tests at intervals, especially for the purpose of regulation or control.

French

Domaine(s)
  • Instruments scientifiques
  • Appareils de contrôle et d'enregistrement
  • Dispositifs de sécurité
  • Pollution de l'air
CONT

Le soudeur doit utiliser un détecteur de gaz dans les enceintes confinées pour assurer sa sécurité (risque d'anoxie si oxygène O2 < 17 %).

OBS

Ne pas confondre les termes «détecteur», «capteur» et «appareil de surveillance (en continu)» (en médecine : «moniteur»). Un détecteur (en anglais : «detector») décèle, révèle la présence d'un corps, d'un phénomène caché (gaz, radiation, phénomène électrique, vibration, etc.); un capteur permet de détecter un phénomène physique en vue de le représenter sous la forme d'un signal (généralement électrique), c'est une partie d'un détecteur; un appareil de surveillance en continu (moniteur, en médecine, en anglais : «monitor») effectue, comme son nom l'indique, des mesures en continu à des périodes données.

Spanish

Save record 33

Record 34 2002-02-28

English

Subject field(s)
  • Scientific Instruments
  • Measuring Instruments
  • Security Devices
  • Air Pollution
DEF

A device sensitive to some kinds of gases or a particular gas, usually in terms of the change in voltage or resistance as a function of the gas concentration.

CONT

Sensors that are available for monitoring and measurement in chemistry include: ... a carbon dioxide gas sensor for displaying the concentration of carbon dioxide gas ...

CONT

Gas Sensor Testing Stations. The Coal Mines Technical Services workshop has the facility to design and construct testing stations to a customer's specifications, enabling them to carry out systematic integrity checks on their gas detector sensors.

OBS

Do not confuse the three terms "detector", "sensor" and "monitor." A detector (in French: "détecteur") is used to detect the presence of anything liable to escape observation, to indicate any deviation from normal conditions, or the like; a sensor (in French: "capteur") gives a signal for the detection or measurement of a physical property to which it responds, it is a part of a detector; a monitor (in French: "appareil de surveillance en continu") measures or tests at intervals, especially for the purpose of regulation or control.

French

Domaine(s)
  • Instruments scientifiques
  • Appareils de mesure
  • Dispositifs de sécurité
  • Pollution de l'air
CONT

Développement des capteurs de gaz à partir d'oxyde métallique semi-conducteur. [...] Depuis une quinzaine d'années, cette équipe travaille dans le domaine des capteurs de gaz. Ces dispositifs de conception relativement simple et de faible coût sont aptes à être utilisés dans des réseaux de mesure ou dans des dispositifs autonomes de petites dimensions.

OBS

Ne pas confondre les termes «détecteur», «capteur» et «appareil de surveillance (en continu)» (en médecine : «moniteur»). Un détecteur (en anglais : «detector») décèle, révèle la présence d'un corps, d'un phénomène caché (gaz, radiation, phénomène électrique, vibration, etc.); un capteur constitue l'élément sensible d'un détecteur qui permet de traduire un phénomène physique, chimique ou biologique en une grandeur mesurable, en le représentant sous la forme d'un signal (généralement électrique); un appareil de surveillance en continu (moniteur, en médecine, en anglais : «monitor») effectue, comme son nom l'indique, des mesures en continu à des périodes données.

Spanish

Save record 34

Record 35 2001-05-17

English

Subject field(s)
  • Chemistry
  • Scientific Instruments
  • Milling and Cereal Industries
CONT

In thermal conductivity analysers, a Wheatstone Bridge Circuit measures the imbalance caused by passing gas over detector filaments, using half of the cells for the fumigant air mixture and the other half for air as a control. This analyser, in a portable form, is commonly used to check for methyl bromide in ship holds, but it can also be calibrated for other gases. It will not differentiate between fumigants if mixtures are used.

French

Domaine(s)
  • Chimie
  • Instruments scientifiques
  • Minoterie et céréales
CONT

Dans ce genre d'appareil, on utilise un circuit à pont de Wheatstone pour mesurer le déséquilibre provoqué par le passage d'un gaz au-dessus des filaments détecteurs. La moitié des cellules sert à l'analyse du mélange fumigant/air; l'autre moitié sert aux mesures témoins avec de l'air uniquement. On utilise couramment des modèles portatifs pour mesurer les concentrations de bromure de méthyle dans les cales de navire, mais on peut aussi étalonner les analyseurs en fonction d'autres gaz. En pratique, les analyseurs à conductivité thermique conviennent mal pour l'analyse de mélanges de fumigants.

Spanish

Save record 35

Record 36 2001-05-17

English

Subject field(s)
  • Chemistry
  • Scientific Instruments
  • Milling and Cereal Industries
CONT

Chemical spot tests use glass detector tubes to determine concentrations of a wide range of gases in air. The tubes are filled with a chemical that reacts with a particular gas to give a colour development as air is drawn through the tube. Chemical spot testing equipment is available from at least three manufacturers.

French

Domaine(s)
  • Chimie
  • Instruments scientifiques
  • Minoterie et céréales
CONT

Ces tubes, en verre, permettent de déterminer les concentrations d'une grande variété de gaz dans l'air. Les tubes contiennent des produits chimiques qui réagissent avec le gaz qu'on y introduit à l'aide d'un soufflet, en donnant une réaction colorée dont la longueur est proportionnelle à la concentration du gaz. Au moins trois fabricants produisent ce genre de tube.

Spanish

Save record 36

Record 37 2000-09-19

English

Subject field(s)
  • Industrial Techniques and Processes
  • Printed Circuits and Microelectronics
DEF

A leak detector employing two similar gauge tubes in a bridge circuit with a trap which is selective for the tracer gas between the system and one of the tubes.

French

Domaine(s)
  • Techniques industrielles
  • Circuits imprimés et micro-électronique

Spanish

Save record 37

Record 38 2000-09-19

English

Subject field(s)
  • Industrial Techniques and Processes
  • Printed Circuits and Microelectronics
DEF

A form of leak test in which the interior of an enclosure is actively evacuated while a tracer gas is applied to the exterior. The objective is to draw in some of the gas through possible leakage paths so that its presence becomes evident to a leak detector which will respond to the type of the type of gas used and which is connected in the evacuating system.

French

Domaine(s)
  • Techniques industrielles
  • Circuits imprimés et micro-électronique

Spanish

Save record 38

Record 39 2000-08-09

English

Subject field(s)
  • Scientific Instruments
  • Analytical Chemistry
  • Peace-Keeping Operations
  • Arms Control
CONT

First described by Lovelock in 1958 the argon detector is based upon the excitation of argon carrier gas to a metastable state by collision with accelerated secondary electrons produced from the ionization of other argon atoms.

OBS

argon detector: term extracted from the "Disarmament and Peace Keeping" glossary with the permission of the United Nations Office at Geneva.

French

Domaine(s)
  • Instruments scientifiques
  • Chimie analytique
  • Opérations de maintien de la paix
  • Contrôle des armements
CONT

Détecteurs à ionisation d'argon ou d'hélium. Les deux détecteurs fonctionnent suivant un principe analogue. Des atomes du gaz vecteur Ar ou He passent dans un état excité sous l'influence d'un rayonnement radioactif issu généralement d'une source de tritium. Les composés dont le potentiel d'ionisation est inférieur à l'énergie des atomes excités du gaz vecteur sont ionisés par ceux-ci. Les ions formés sont collectés par une électrode portée à un potentiel de 300 à 1 000 V. Ce détecteur a été décrit par Lovelock avec de l'argon comme gaz vecteur.

CONT

Détecteurs sélectifs. [...] Nous citerons encore les détecteurs électrochimiques permettant d'obtenir des réponses sélectives pour les composés azotés, chlorés ou soufrés, et d'autres, tels que le détecteur à ionisation d'argon ou d'hélium, détectant des traces de gaz permanents, de même que le détecteur à ionisation par haute fréquence.

OBS

détecteur à ionisation d'argon : terme tiré du lexique «Désarmement et Maintien de la Paix» avec l'autorisation de l'Office des Nations Unies à Genève.

Spanish

Save record 39

Record 40 2000-07-14

English

Subject field(s)
  • Space Exploration Equipment and Tools
CONT

Another instrument, the lunar ionosphere detector, sensed a gas cloud that arrived a few seconds before the seismic signal and lasted for more that a minute.

French

Domaine(s)
  • Équipement et outillage d'exploration spatiale

Spanish

Save record 40

Record 41 2000-06-30

English

Subject field(s)
  • Burners and Steamfitting
  • Combustion and Fuels (Fireplaces)
CONT

The thermopile heat of combustion detector is at the heart of each heating value transmitter. Air is used as a heat transfer media and flows around the combustion chamber. Any increase in the heat produced by the combustion of a controlled sample of process gas is immediately sensed and reported to the microprocessor. Air enters the combustion chamber on the outside cold junctions where its heat is measured, then flows down the outside of the thermopile towards the viewer to turn through 180° past the end of the thermopile assembly and then flows up through the heat exchanger... to mix with the heated flue gases from the burner.

French

Domaine(s)
  • Fumisterie et brûleurs
  • Combustion et combustibles (Foyers)

Spanish

Save record 41

Record 42 2000-05-25

English

Subject field(s)
  • Burners and Steamfitting
  • Safety Devices (Mechanical Components)
DEF

The components of a flame detection system which detect the presence or absence of a flame.

DEF

Component of a combustion safety control that senses flame.

OBS

A flame detector may be used, for example, as a flame failure device to shut down the gas supply to the main burner of a furnace when the pilot flame goes out.

Key term(s)
  • flame sensing element

French

Domaine(s)
  • Fumisterie et brûleurs
  • Organes de sécurité (Composants mécaniques)
DEF

Dispositif qui délivre un signal en fonction de la présence ou de l'absence d'une flamme.

CONT

Le système de surveillance de flamme englobe tout l'appareillage de commande et de sécurité, ainsi que les éléments annexes nécessaires au bon fonctionnement et à la sécurité d'emploi du brûleur dans les conditions prévues d'utilisation. Il comprend donc: [...] un appareil de commande (primary control), véritable cerveau du système. Il travaille en liaison avec le détecteur de flamme (flame detector).

CONT

Les équipements de sécurité comprennent: - les appareils de détection de la flamme par la température des fumées, par l'éclairement de la flamme; - les appareils de commande [...].

Spanish

Save record 42

Record 43 2000-04-28

English

Subject field(s)
  • Burners and Steamfitting
  • Ovens, Furnaces and Boilers (Heating)
DEF

A pipe, mounted to the front plate of a combustion chamber, through which an optical flame detector sights the burner flame.

CONT

The Forney Dual Fuel Horn Igniter assembly consists of a mounting plate, combination oil and gas gun, High Energy Spark Igniter(HESI), 6" combustion air tube, flame detector and horn. The mounting plate retains the oil/gas gun, HESI and flame detector guide pipe. The flame detector head is mounted on a 1" sight pipe which provides an unobstructed view of the flame inside the horn.

CONT

This fibre optic viewing head extension is particularly useful for solving the sighting problems associated with tilting or movable burners. The flame envelope from this type of burner can be tilted from a horizontal position up or down as much as 30 degrees. It would be impossible to follow this flame pattern with a fixed sighting through the wind-box. Welding the tip guide (lens end) of this viewing head extension to the movable air compartment nozzle solves this problem. This viewing head extension can also be used for those applications where it is impossible to find a clear unobstructed view of the flame using a standard sight pipe. Here again the viewing head extension is mounted inside the furnace for a clear unobstructed view of the flame.

French

Domaine(s)
  • Fumisterie et brûleurs
  • Fours et chaudières (Chauffage)

Spanish

Save record 43

Record 44 1999-03-08

English

Subject field(s)
  • Analytical Chemistry
CONT

Any regular change occurring in the baseline signal from the detector in g. c. [gas chromatography] or h. p. l. c. [high-performance liquid chromatography]. It commonly arises from changes in the flow rate of the mobile phase or from deterioration of the detector such as might occur if the stationary phase is bleeding off the column.

OBS

[Detector drift] is represented as a continuous up-scale or down-scale excursion of the baseline, which tends to camouflage both noise and small peaks.

Key term(s)
  • base-line drift

French

Domaine(s)
  • Chimie analytique
Key term(s)
  • déplacement de la ligne de base

Spanish

Save record 44

Record 45 1998-05-20

English

Subject field(s)
  • Chemistry
CONT

Photoionization detector... consists of a chamber into which gases suitable for the discharge such as helium, argon, nitrogen, or hydrogen are introduced through [a] tube which serves as the cathode for the discharge. The ultraviolet radiation or glow discharge in the hollow cathode, maintained by a small current between the cathode and discharge anode, is sufficiently energetic to ionize components in the carrier gas effluent entering through the tube, the collecting electrode(anode) for the ions liberated within the chamber enclosed by the second cathode.

French

Domaine(s)
  • Chimie
CONT

Une version commerciale de ce détecteur est apparue récemment sur le marché, il est composé d'une lampe UV [détecteur à photoionisation] scellée qui émet un rayonnement à 121,6nm (10,2 eV) à travers une fenêtre en fluorure de magnésium. Si le soluté passant dans ce détecteur a un potentiel d'ionisation inférieur à 10,2eV, il s'ionise en absorbant un photon. Les ions issus de cette photoionisation sont collectés en appliquant un potentiel positif sur une des électrodes. Le courant qui en résulte est amplifié par un électromètre identique à celui utilisé avec un détecteur à ionisation de flamme.

Spanish

Save record 45

Record 46 1998-05-14

English

Subject field(s)
  • Analytical Chemistry
CONT

With helium as discharge and carrier gas, the detector is very sensitive to permanent gases...

PHR

argon discharge, capillary discharge, spark discharge, visible glow discharge.

PHR

self-sustained discharge.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 46

Record 47 1998-05-14

English

Subject field(s)
  • Analytical Chemistry
CONT

In 1956, Harley and Pretorius described a simple discharge detector for gas chromatography based on the electrical properties of a glow discharge, the voltage across the gaseous discharge being a function of the type of gas present. Druyvesteyn and Penning in 1940 reviewed the complex nature of the glow discharge, noting that the discharge is maintained by electrons emitted from the cathode which result from processes related to positive ion bombardment, photoelectric emission, and collisions with excited atoms. When trace quantities of a material eluted from a chromatographic column enter the detector(consisting of a small platinum disk cathode and a tungsten wire anode), a voltage change resulted which was recorded.

OBS

Using neon lamps Pitkethly found... that these detector were current and pressure independent at 1-1. 5 mS and 3-5 mm Hg.... In 1958, Roberts and Hinkle evaluated glow discharge tubes as detectors for compounds in the concentration range of 5-500 ppm and concluded that the detector was not applicable to general-purpose use.... More recently, Wilhite described glow discharge-type devices which act electrically similar to a gas-filled voltage-regulator tube... Riley described the use of an argon purity meter, a glow-type discharge detector, for the determination of small concentrations(0-1500 ppm) of impurity gases in argon.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 47

Record 48 1998-05-14

English

Subject field(s)
  • Analytical Chemistry
CONT

Flame Emissivity Detector. Another detector based on monitoring a specific property of a flame, its emissivity, was developed by Grant, who mixed coal gas in constant proportions with the effluent from a chromatographic column; this coal gas/effluent mixture burned at a wide stainless steel jet. The emissivity of the flame, changing as the flame's carbon content is varied, is measured with the aid of a metal reflector, glass condensing lens, and selenium photocell; these are held in place from each other at their proper optical distances.... For low background emissivity values, response is nonlinear. However, by controlling the coal gas flow rate to maintain emissivity between 0. 60 and 0. 80 mV, detector response is linear over a wide temperature range.

OBS

For the determination of combustible components of organic origin in gas chromatographic effluents, various principles of detection based on flame reactions have been utilized, namely, the hydrogen flame temperature, flame emissivity, and flame ionization detectors. In all reported systems, specific flame properties were monitored. Whereas Scott measured the flame temperature of the exit gas at a small jet and Grant the flame’s emissivity by optical means, Mc William and Dewar and Harley et al. advanced new detection concepts based on the electrical or ionization properties of hydrogen/oxygen flames.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 48

Record 49 1998-05-14

English

Subject field(s)
  • Analytical Chemistry
DEF

The gas emerging from a column or from a detector.

PHR

effluent hydrocarbon stream.

PHR

effluent was bubbled through the solution.

French

Domaine(s)
  • Chimie analytique
CONT

Les effluents de la colonne chromatographique pénètrent dans une flamme dont le combustible (hydrogène) est prémélangé au gaz vecteur et dont le carburant (air) arrive extérieurement et alimente la combustion par diffusion.

PHR

coupe de l'effluent, dégazage de l'effluent, fractionnement de l'effluent, indice de réfraction de l'effluent, thermorégulation de l'effluent.

PHR

effluent conducteur.

Spanish

Save record 49

Record 50 1997-07-14

English

Subject field(s)
  • Plasma Physics
  • Analytical Chemistry
OBS

Form of detector using mw of carrier gas(He or Ar) in capillary gas chromatography.

French

Domaine(s)
  • Physique des plasmas
  • Chimie analytique

Spanish

Save record 50

Record 51 1997-05-01

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Printed Circuits and Microelectronics
DEF

A leak detector output signal due to entrapped tracer gas in the vacuum system which cannot be quickly removed by pumping, a virtual leak of the tracer gas.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Circuits imprimés et micro-électronique

Spanish

Save record 51

Record 52 1996-06-13

English

Subject field(s)
  • Compressed and Liquefied Gas (Petroleum)
OBS

The Fast Response Gas Sensor, mini-PID model is manufactured by S & J Engineering in Aurora Ontario. The PID stands for Photoionization Detector.

DEF

Apparatus used to measure the concentration of a vapour.

Key term(s)
  • fast-response gas sensor

French

Domaine(s)
  • Gaz de pétrole comprimés et liquéfiés

Spanish

Save record 52

Record 53 1996-05-13

English

Subject field(s)
  • Analytical Chemistry
CONT

In 1963, Bevan and Thoburn introduced a new concept in gas chromatographic detectors-a quantitative integral detector. These investigators made a practical gravimetric detector using an automatic-recording vacuum balance. Since the gravimetric detector integrates, a step-to-step pattern is provided instead of the usual chromatographic succession of peaks. The weight increase from each step-to-step increment is the amount of component present in that fraction and the total weight increase is the total sample weight. If absorption is complete, calibration with synthetic mixtures is not necessary.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 53

Record 54 1996-05-13

English

Subject field(s)
  • Analytical Chemistry
CONT

Semiconductive Thin Film Detector. Using the known principle that the adsorption and desorption of gases cause a change in electrical conductivity of semiconductors, Seiyama et al. developed a new chromatographic detector for gaseous components.... The current, depending upon the resistance of the film, is converted to voltage by the variable resistance, which is fed without amplification to a recorder. Resistance also adjusts the input voltage of the recorder at desired sensitivity. Using zinc oxide as an example of a typical film material, the conductivity of its film maintains a fixed value when the nitrogen carrier gas is passed at a constant flow rate throught the borosilicate glass tube. When a small amount of another gas or vapor is added to the carrier gas, its conductivity is changed.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 54

Record 55 1996-05-13

English

Subject field(s)
  • Analytical Chemistry
CONT

A simple arrangement of two cavities in series showed the feasibility of detecting traces of one gas in another. A klystron was used to generate microwave power which was fed through a wave guide to a transmission-type cavity. Another cavity was mounted in series with and tuned to the same frequency as the first; both cavities were identical except that the second had a gas inlet and outlet ports. From this measuring cell, its microwave energy was sent to a crystal detector. By frequency-modulating the klystron with a 50-cps sine wave voltage on the repeller, a burst of energy passes to the detector each time the generator frequency equals that of the cavities. The detector current is amplified and measured with an oscilloscope. At the beginning of the run, the two cavities are filled with the nitrogen carrier gas and, if the composition in one of the cavities is changed, its electrical size will change... causing a decrease of current from the detector.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 55

Record 56 1996-05-13

English

Subject field(s)
  • Analytical Chemistry
CONT

Kaye adapted a Beckman far-ultraviolet DK-2 spectrophotometer as a gas chromatographic effluent detector to record the spectra of eluted, absorbing materials. Using heated flow-through cells... coupled directly to the thermal conductivity cell' s outlet, he found that absorptivities of most organic vapors were sufficiently large to permit quantitative analysis, and in some instances identification, where specific absorption patterns could be attributed directly to a functional group in certain molecular species. Furthermore, the sensitivity of the far-ultraviolet detector for many compounds possessing intense absorption bands exceeds that of the normal thermal conductivity detector and, in some cases, the hydrogen flame ionization detector.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 56

Record 57 1996-05-13

English

Subject field(s)
  • Analytical Chemistry
CONT

Guillemin et al., in their study of the influence of various operating parameters on the Gow-Mac detector, have shown that response is a function of(1) the nature of the carrier gas and(2) the ratio of the flow rates in the reference and measuring circuits...

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 57

Record 58 1996-05-13

English

Subject field(s)
  • Analytical Chemistry
CONT

As a supplement for the analysis of combustible organic vapors, Behrendt designed a combustion detector which registers the volume increase resulting from the formation of new molecules when organics in the nitrogen carrier gas stream are burned at atmospheric pressure over heated copper oxide in a silica combustion chamber to which is attached a microburet. In principle, the gas amplification within the detector increases with molecular weight of the substance.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 58

Record 59 1996-04-04

English

Subject field(s)
  • Analytical Chemistry
DEF

Detection by means of an electron mobility detector is based upon changes in the mobility of electrons arising from the presence of solutes in the carrier gas(usually argon).

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 59

Record 60 1996-03-08

English

Subject field(s)
  • Analytical Chemistry
CONT

Redox potential detector. For the determination of volatile aliphatic mercaptans in gas chromatographic effluents, Sunner, Karrman, and Sunden used a potentiometric method based on passing the effluent into a solution prepared from 0. 2 ml. of 0. 025M alcoholic iodine and 0. 4 ml. of 0. 05M aqueous potassium iodide made up to 50 ml. with 70% ethanol.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 60

Record 61 1996-03-08

English

Subject field(s)
  • Analytical Chemistry
CONT

Lovelock developed a small detector intended for use with open tubular columns, and a new triode detector having a sensitivity 1000 times greater than his original detector... The triode detector... incorporates a ring electrode, in addition to the normal anode and cathode electrodes, which separates the background current(positive ions liberated by vapor/metastable argon reactions or collisions) of the primary electron stream from the signal current. Basically, both detectors are similar to the simple device in design : their brass or stainless steel chambers function as cathodes; their anodes of the same material are supported coaxially within the chamber by a polytetrafluoroethylene insulator; both contain ports for introduction and escape of the chromatographic column gas effluent from the detectors; and each have a suitable source of alpha or beta radiation.

Key term(s)
  • Lovelock's detector

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 61

Record 62 1996-03-08

English

Subject field(s)
  • Analytical Chemistry
CONT

In a series of papers, Gaziev et al. described an argon detector using promethium-147 as a source of beta radiation, and Frank and Yanovskii constructed a microionization detector for open tubular gas-liquid chromatography based on Pm without the use of an additional gas stream.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 62

Record 63 1996-03-08

English

Subject field(s)
  • Analytical Chemistry
CONT

Thermionic or Electron Impact Detector. In 1957, Ryce and Bryce described a sensitive ionization gauge based on the ionization potentials of vapors. It comprised a filament, a grid, and a plate. The potential difference between the filament and grid accelerated electrons which may ionize any gas in their path. If the grid potential is maintained at a level insufficient to ionize the helium carrier gas... no current flows in the plate circuit. If a potential difference of 18 V is maintained between the filament and the grid, compounds of lower ionization potential in the helium will be ionized and the positive ions produced will yield a cathode current, the current noted being a measure of the ion concentration. Into the modified ionizing chamber, operated at reduced pressure, a small fraction of the column effluent gas stream(less than 0. 5%) was allowed to flow into the gauge through a controlled leak. Over a 0. 02-l. 5 mm Hg pressure range, the sensitivity was approximately proportional to the pressure, and sensitivities in the range of 10[ minus superscript 12] mole were claimed.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 63

Record 64 1996-03-08

English

Subject field(s)
  • Analytical Chemistry
CONT

Dudenbostel and Priestley described an automatic process gas analyzer for propane in propylene using a simple detector in which thermocouple pairs were placed in a twin-chamber cell, each chamber having 0. 40 ml of activated charcoal.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 64

Record 65 1996-03-08

English

Subject field(s)
  • Analytical Chemistry
CONT

This increase in electrical conductivity resulted from the release of sodium vapor from the probe. Using a two-stage flame detection system, one flame placed above the other but separated from it by a sodium hydroxide-treated wire mesh screen, hydrogen gas was added to the effluent of the column, and the carrier gas-air-hydrogen mixture was burned in the lower flame detector with its resulting electrical conductivity being the same as that of the usual flame detector.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 65

Record 66 1996-03-07

English

Subject field(s)
  • Analytical Chemistry
CONT

For the determination of metal chelates separated by gas chromatography, Juvet and Durbin applied a flame photometer as a sensitive, selective, and quantitative detector for the determination of chromium, iron, and rhodium hexafluoroacetylacetonates...

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 66

Record 67 1996-03-07

English

Subject field(s)
  • Analytical Chemistry
CONT

Feldmand and Batistoni have developed a spectroscopic detector for determination of individual halogens, sulfur, phosphorus, carbon, and metals in gas chromatographic effluents.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 67

Record 68 1996-03-07

English

Subject field(s)
  • Analytical Chemistry
CONT

In addition to the simple argon detector with a 3-8ml volume designed for use with packed columns, Lovelock developed a small detector intended for use with open tubular columns, and a new triode detector having a sensitivity 1 000 times greater than his original detector... Basically [the triode detector and the small detector] are similar to the simple device in design : their brass or stainless steel chambers function as cathodes; their anodes of the same material are supported coaxially within the chamber by a polytetrafluoroethylene insulator; both contain ports for introduction and escape of the chromatographic column gas effluent from the detectors; and each have a suitable source of alpha or beta radiation.

Key term(s)
  • Lovelock's detector

French

Domaine(s)
  • Chimie analytique
Key term(s)
  • détecteur de Lovelock

Spanish

Save record 68

Record 69 1996-03-07

English

Subject field(s)
  • Analytical Chemistry
CONT

Titration detector. The visual or automatic titration methods of James and Martin provided techniques for the titration of chromatographically separated volatile monocarboxylic acids. In the presence of an indicator, the titration can be followed visually or automatically recorded. With the automatic titration buret, the separated acidic or basic components in the carrier gas pass directly into the titration cell. A suitable colorimetric indicator... is used with a photoelectric relay to control the addition of titrant from a syringe-type dispensing buret, the plunger of which is coupled to a recording pen.

OBS

Mc Innes [improved the automatic titrator by including] a polyethylene gland [which incorporated] a mercury seal for the recording buret, an automatic switch-off device for the apparatus, and a photoelectric unit which provided stable and full control for dispensing titrant.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 69

Record 70 1989-04-03

English

Subject field(s)
  • Scientific Instruments
  • Environmental Studies and Analyses
  • Air Pollution
CONT

Optoacoustic detector. Light which is absorbed by a molecule is generally reradiated from the molecule in the form of heat. If a laser, at an absorbing wavelength of a gas of interest, is passed through a closed cell, the temperature of the entire gas in the cell will rise and thus the pressure of the gas in the cell will rise. If the laser is turned on and off at a frequency of 100-20000 Hz, the resulting pressure rises and drops can be picked up as a signal by sensitive microphones. This somewhat odd combination of optics and acoustics turns out to have several advantages over systems which measure the absorption directly. The absorption will be quite small and thus the change in intensity of the laser beam is nearly impossible to detect. Because pressure in the cell rises more quickly for small length cells, this effect exactly cancels out gains in overall absorption by making the cell longer. Thus, a small optoacoustic cell will accomplish the same as a larger cell making its size a great asset.... The device is being tested as a sniffer for bomb vapours and for ambient air analyses.

French

Domaine(s)
  • Instruments scientifiques
  • Études et analyses environnementales
  • Pollution de l'air

Spanish

Save record 70

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