Datasheet

7. TEMPERATURE AND HUMIDITY
The sensitivity characteristics of the TGS $813 Sensor are altered by
changes in atmospheric temperature and humidity.
The detection principle
of the TGS is based on Chemical adsorption and desorption of gases on the
Sensor surface.
Because these
reactions are temperature dependent and
water vapour tan be considered a gas, the effects of temperature and
humidity changes cannot be eliminated from the Sensor.
These effects
tan however be reduced by circuit design as described in section 11.
Figs. 7-9show thetemperature and/or humidity dependency of the type
#813 Sensor.
Ambtent temperahe (‘C:
FIG.7 i"GS #813 DEPENDENCY ON TEMPERATURE AND HUMIDITY
Test condition:
Vc 1OV A.C. / VH 5.0V A.C. / RL 4KQ
Remarks:
Ro:Sensor resistance in air containing
1000ppm of Methane gas at 20°C and
65% R.H.
R: Sensor resistance in air containing
1000ppm of Methane gas at different
temperature and humidity