Type | TGS | VQ | GOW |
---|---|---|---|
Measurement method | Semiconductor | Heat reduction | Thermal 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 effect | 3 % | 2 % | 3 % |
Response time (t90) | approx. 55 sec. | approx. 40 sec. | approx. 55 sec. |
Pressure effect (atm.) | 1 % | 1 % | 1 % |
Mounting position | optional | optional | optional |
Application | Poisonous, combustible and explosive gases in the LEL region | Poisonous, combustible and explosive gases in the LEL region | Gases exhibiting substantial differences in thermal conductivity, compared to air |
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 | unlimited, when used for gases not causing catalytic poisoning | unlimited, when used for gases not causing catalytic poisoning | unlimited, when used with gases that do not attack aluminium, rhenium-tungsten or gold |
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 (W x H x D) |
150 x 170 x 105 mm | 150 x 170 x 105 mm | 150 x 170 x 105 mm |
Weight | 2,7 kg | 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 | -25 °C to +55 °C | -25 °C to +55 °C | -25 °C to +55 °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 | optional | optional |
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 |
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 = Disffusion filter
2 = Test resistor
3 = Comparison resistor
1 = Anode
2 = Electrolyte
3 = Cathode
4 = Diffusion path
5 = Diffusion filter
6 = Test gas