Datasheet

Revised 10/12
4
TECHNICAL INFORMATION FOR TGS2620
0
1
3
4
5
0 1000 2000 3000 4000 5000 6000
VRL (v)
Gas concentration (ppm)
Air
Ethanol
Iso-butane
Methane
Hydrogen
Carbon monoxide
●
0
1
10
100
10 100 1000 10000
Rs/Ro
Gas concentration (ppm)
Air
Methane
CO
Iso-butane
Hydrogen
Ethanol
2. Typical Sensitivity Characteristics
2-1 Sensitivity to various gases
Figure 4 shows the relative sensitivity of TGS2620
to various gases. The Y-axis shows the ratio of the
sensor resistance in various gases (Rs) to the sensor
resistance in 300ppm of ethanol (Ro).
Using the basic measuring circuit illustrated in Fig.
2 and with a matched RL value equivalent to the Rs
value in 300ppm of ethanol, will provide the sensor
output voltage (VRL) change as shown in Figure 5.
NOTE:
All sensor characteristics in this technical brochure
represent typical sensor characteristics. Since the Rs
or output voltage curve varies from sensor to sensor,
calibration is required for each sensor (for additional
information on calibration, please refer to the Technical
Advisory ‘Technical Information on Usage of TGS Sensors
for Toxic and Explosive Gas Leak Detectors’).
Fig. 4 - Sensitivity to various gases (Rs/Ro)
Fig. 5 - Sensitivity to various gases (VRL)