Datasheet

Revised 08/04
6
TECHNICAL INFORMATION FOR TGS2600
Figure 8 shows the temperature and humidity
dependency of TGS2600 in ethanol (used as a
representative gas for VOCs to which the sensor is
likely to respond). The Y-axis shows the ratio of
sensor resistance in 30ppm of ethanol under various
atmospheric conditions (Rs) to the sensor resistance
in clean air under the same atmospheric conditions
(Ro).
This section demonstrates that, when used in the
range of 10˚C~50˚C, sensitivity in air (Fig. 6) shows
temperature dependency, but sensitivity in gas (Figs.
7 & 8) is relatively unaffected by temperature. As a
result, temperature compensation for the sensor is
not required, although is a greater accuracy is desired,
temperature compensation for air values can be done.
2-3 Heater voltage dependency
Figure 9 shows the change of the sensor resistance
ratio in clean air according to variations in the heater
voltage (VH). The Y-axis shows the ratio of sensor
resistance in clean air at various heater voltages (Rs)
compared to sensor resistance in clean air at VH=5.0V
(Ro).
Figure 10 shows the change of the sensor resistance
ratio in hydrogen and ethanol according to variations
in the heater voltage (VH). The Y-axis shows the ratio
of sensor resistance in gases at various heater voltages
(Rs) compared to sensor resistance in clean air at the
same heater voltage (Ro).
Note that 5.0V as a heater voltage must be maintained
because variance in applied heater voltage will cause
the sensor’s characteristics to be changed from the
typical characteristics shown in this brochure.
Fig. 8 - Temperature and humidity dependency (Rs/Ro)
in 300ppm of ethanol
Fig. 9 - Heater voltage dependency in clean air
0.1
1
-20-100102030405060
40%
65%
85%
100%
Rs/Ro
Ambient temperature (˚C)
Gas: 30ppm ethanol
RH%:
0.1
1
10
3.5 4.0 4.5 5.0 5.5 6.0 6.5
Rs/Ro
Heater Voltage (V)
0.1
1
10
3.5 4.0 4.5 5.0 5.5 6.0 6.5
Rs/Ro
Heater Voltage (V)
H2 10ppm
EtOH 30ppm
Fig. 10 - Heater voltage dependency in various gases