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Gas transmitter - ADOS LCTR 903

The gas transmitter ADOS GTR 196 is suitable for continuous measurement of gases in normal areas and areas where there is a risk of explosion.
By employing 5 different types of sensor, noxious, explosive and non-combustible gases and vapours can be measured.
A current signal is generated that is proportional to the measured concentration of gas, which is transmitted to an evaluation unit placed in a safe area, away from any dangers of explosion.
The type test of the explosion-protected gas transmitter, is completed by the KEMA.

TGS sensor

The TGS sensor contains a semiconductor sensor, which is constructed on SnO2-sintered N-substrate. When combustible or reducing gases are absorbed by the surface of the sensor, the concentration of the test gas is determined by the change in conductivity.

VQ sensor

The head of the VQ sensor functions on the principle of heat reaction. When combustible or reducing gases or vapours come in contact with the measuring element, they are subjected to catalytic combustion, which causes a rise in temperature; this rise causes a change in the resistance of the measuring element which is used as a measure of the component of gas being tested.

The inert element is for compensating the temperature and conductivity of the test gas.

GOW sensor

The GOW sensor functions on the principle of thermal conductivity. Two rhenium-tungsten resistors are used as a measuring element, where the comparison element is subjected to normal ambient air and the measuring element is subjected to the test gas. Any change in the concentration of gas at the measurement element causes a change in temperature, which is due to the variation of conductivity.

The resultant change in resistance is a direct measure of the gas concentration.


TOX sensor

The TOX sensor is a measurement system with an electro-chemical cell, where the sampled gas is measured by diffusion. In the case of oxygen measurement the oxygen content is reduced in an electrolyte, thus producing a small flow of current (electro-chemical process). At a constant air pressure, this current is directly proportional to the oxygen concentration in the sampled air.

The IR sensor

The test gas flows through a measurement chamber that incorporates an IR radiating source and a two-channel infrared detector. The intensity of the infrared radiation is reduced as it passes through the gas molecules. The concentration of the gas can then be calculated by the magnitude of the reduction in intensity. Since only absorption of the wavelength (A) specific to the gas under test in relation to the wavelength (B) not absorbed by a test gas is considered, interference due to dust, ageing etc., is almost fully compensated.

Feature
  • Chemical industry

  • Manufacture of paints and varnishes

  • Plastics processing plants

  • Sewage works

  • Gas-fired boiler systems

  • Liquid gas storage houses

  • Laboratories

  • Oxygen concentration measurements

  • Refineries

  • Cold storage houses (Ammonia monitoring)

  • Paint spraying booths

  • and many more.

TypeTGSVQGOW
Measurement methodSemiconductorHeat reductionThermal conductivity
Measurement range

ppm ranges to 100 % LEL

ppm ranges to 100 % LEL

from 0-5 Vol % to 0-100 Vol %

Percentage error of f.s.d.±5 %±3 %±5 %
Temperature range-25 °C to +55 °C-25 °C to +55 °C-25 °C to +55 °C
Temperature effect3 %2 %3 %
Response time (t90)approx. 55 sec.approx. 40 sec.approx. 55 sec.
Pressure effect (atm.)1 %1 %1 %
Mounting positionoptionaloptionaloptional
ApplicationPoisonous, combustible and explosive gases in the LEL regionPoisonous, combustible and explosive gases in the LEL regionGases exhibiting substantial differences in thermal conductivity, compared to air
Versions availableindustrial (Al), industrial (VA)- and Ex-versionindustrial (Al), industrial (VA)- and Ex-versionindustrial (Al), industrial (VA)- and Ex-version
Service life of the sensorunlimited, when used for gases not causing catalytic poisoningunlimited, when used for gases not causing catalytic poisoningunlimited, when used with gases that do not attack aluminium, rhenium-tungsten or gold
Supply voltage15 – 30 V15 – 30 V15 – 30 V
Interfaces3-wire techniques 4-20 mA or LON? 4-wire techniques, galvanically isolated, data transfer 78 kB/s

3-wire techniques 4-20 mA or LON? 4-wire techniques, galvanically isolated, data transfer 78 kB/s

3-wire techniques 4-20 mA or LON? 4-wire techniques, galvanically isolated, data transfer 78 kB/s
Protection

II 2 G

Ex demb [ia] IIC T

II 2 G

Ex demb [ia] IIC T6

II 2 G

Ex demb [ia] IIC T6

Ex-Version

KEMA 03 ATEX 2403 X

KEMA 03 ATEX 2403 XKEMA 03 ATEX 2403 X
Protection classIP 54IP 54IP 54

Dimensions
(W x H x D)

150 x 170 x 105 mm150 x 170 x 105 mm150 x 170 x 105 mm
Weight2,7 kg2,7 kg2,7 kg


TypeTOXIRPID
Measurement methodElectro-chemical cellInfraredPhoto-Ionisation
Measurement range

ppm ranges to 100 LEL %

0–100 % LEL CH4, C3H8, C2H2,

0–100 Vol % CH4

0–1, 2, 3, 4, 5 Vol % CO2

0 – 200 ppm to

0 – 2.000 ppm

Percentage error of f.s.d.± 3%± 2 %± 5 %
Temperature range-25 °C to +55 °C-25 °C to +55 °C-25 °C to +55 °C
Temperature effect2 %2 %3 %
Response time (t90)approx. 60 sec.approx. 45 sec.approx. 120 sec.
Pressure effect (atm.)1 %4 %1 %
Mounting positionoptionaloptionaloptional
Application

O2, CO, NH3, NO2,SO2, H2S a.o.

CH4 (Vol %; LEL) Propane (LEL) CO2 (Vol %)e.g. C7H8, C8H10 CHCl3, PH3
Versions available

industrial (Al),industrial (VA)- and Ex-version

industrial (Al),industrial (VA)- and Ex-versionindustrial (Al),industrial (VA)- and Ex-version
Service life of the sensor12 months to 5 years depending on the measuring cellapprox. 5 years12 monthss
Supply voltage15 – 30 V15 – 30 V15 – 30 V
Interfaces3-wire techniques 4-20 mA or LON? 4-wire techniques, galvanically isolated, data transfer 78 kB/s3-wire techniques 4-20 mA or LON? 4-wire techniques, galvanically isolated, data transfer 78 kB/s3-wire techniques 4-20 mA or LON? 4-wire techniques, galvanically isolated, data transfer 78 kB/s
Protection

II 2 G

Ex demb [ia] IIC T

II 2 G

Ex demb [ia] IIC T6

II 2 G

Ex demb [ia] IIC T6

Ex-Version

KEMA 03 

ATEX 2403 

KEMA 03 

ATEX 2403 X

KEMA 03 

ATEX 2403 X

Protection classIP 54IP 54IP 54
Dimensions (WxHxD)100 x 180 x 80 mm100 x 180 x 80 mm100 x 180 x 80 mm
Weight1,1 kg1,1 kg1,1 kg


Gas transmitter
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