Datasheet

8. TIME FOR INITIAL STABILIZATION
A TGS Sensor which has been stored unenergized for a lang period takes
some time to resch its normal operating condition following switch on.
This "Initial Action"
characteristic in fresh air is shown in Fig.10.
From the moment of switch on the sensor's conductivity first rises rapidly
and then falls towards its final stable value.
The time taken to stabilize
is a function of the sensor's storage time and atmosphere.
In general, the
longer the storage time
the longer the initial action time.
In the case of
Sensor type 8813,
the initial action time reaches its maximum value after
about 20 days storage.
In normal applications the initial action time will
be less than 2 minutes.
It is important to note that if the Sensor
is placed in the air containing
gas immediately after the "Initial Action",
then the Rs value will appear
according to the characteristics
described in the next section.
Time (min !
FIG. 10. INITIAL ACTION OF TGS 213 STORED FOR
3 weeksWtTHOUT CURRENT-INPUT.
(12)