Ados

GTR 196

Gas Transmitter
GTR 196

Application

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 6 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.

Test certificate: KEMA 03 ATEX 2403 X
Degree of protection: II 2 G, Ex demb [ia] IIC T6

Fields of Application

  • 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.

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.

1 = Circuit voltage
2 = Heating voltage
3 = Load resistor

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.

1 = Catalyzer pellistor
2 = Electric connections
3 = Inert pellistor
4 = Diffusion filter

PID sensor

 

The sampled gas flows through a measurement chamber,
that incorporates a UV radiating source and a pair of
electrodes with opposing polarity. The gas molecules
to be detected are ionized by the UV radiation.
The resulting positively charged molecules and the
electrons are attracted to the relevant electrode. The current generated is a measure of the gas concentration.
Using the PID measuring head, volatile organic compounds (VOC) can be measured, the ionisation potential of which is less than the energy in the UV radiating source (10,6 eV), e.g. aromatic hydrocarbons like toluol (C7H8) and xylene (C8H10) as well as chlorinated hydrocarbons like trichloroethylene (CHCl3). The detection of toxic gases like phosphine (PH3) is also possible.

1 = UV radiating source
2 = Test gas
3 = Capacitive charge measurement

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.

1 = Anode
2 = Electrolyte
3 = Cathode
4 = Diffusion path
5 = Diffusion filter
6 = Test gas

 

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.

1 = Infrared-radiation source
2 = Test gas
3 = Diffusion filter
4 = Infrared-detector
5 = Measurement chamber

Technical data

Type TGS VQ
Measurement method Semiconductor Heat reduction
Measurement range ppm ranges to
100 % LEL
ppm ranges to
100 % LEL
Percentage error of f.s.d. ±5 % ±3 %
Temperature range -20 °C to +45 °C -20 °C to +45 °C
Temperature effect 3 % 2 %
Response time (t90) approx. 60 sec. approx. 40 sec.
Pressure effect (atm.) 1 % 1 %
Mounting position optional ± 90° from the vertical mounting position optional ± 90° from the vertical mounting position
Application Poisonous, combustible and explosive gases in the LEL region Poisonous, combustible and explosive gases in the LEL region
Versions available industrial (Al), industrial (VA)- and Ex-version industrial (Al), industrial (VA)- and Ex-version
Service life of the sensor approx. 5 years, when used for gases not causing catalytic poisoning approx. 5 years, when used for gases not causing catalytic poisoning
Supply voltage 15 – 30 V 15 – 30 V
Interfaces 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

Ex-Version
II 2 G
Ex demb [ia] IIC T6
KEMA 03
ATEX 2403 X
II 2 G
Ex demb [ia] IIC T6
KEMA 03
ATEX 2403 X
Protection class IP 54 IP 54
Dimensions
(W x H x D)
150 x 170 x 105 mm 150 x 170 x 105 mm
Weight 2,7 kg 2,7 kg

 

Type TOX IR PID
Measurement method Electro-chemical cell Infrared Photo-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 -20 °C to +45 °C -20 °C to +45 °C -20 °C to +45 °C
Temperature effect 2 % 2 % 3 %
Response time (t90) approx. 60 sec. approx. 45 sec. approx. 120 sec.
Pressure effect (atm.) 1 % 4 % 1 %
Mounting position optional ± 90° from the vertical mounting position optional ± 90° from the vertical mounting position optional ± 90° from the vertical mounting position
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-version
industrial (Al),
industrial (VA)-
and Ex-version
Service life of the sensor 12 months to 5 years depending on the measuring cell approx. 5 years 12 monthss
Supply voltage 15 – 30 V 15 – 30 V 15 – 30 V
Interfaces 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 3-wire techniques 4-20 mA or LON© 4-wire techniques, galvanically isolated, data transfer 78 kB/s
Protection

Ex-Version
II 2 G
Ex demb [ia] IIC T6
KEMA 03
ATEX 2403 X
II 2 G
Ex demb [ia] IIC T6
KEMA 03
ATEX 2403 X
II 2 G
Ex demb [ia] IIC T6
KEMA 03
ATEX 2403 X
Protection class IP 54 IP 54 IP 54
Dimensions (WxHxD)

100 x 180 x 80 mm

100 x 180 x 80 mm

100 x 180 x 80 mm

Weight 1,1 kg 1,1 kg 1,1 kg