Vaisala HMT310 - Manual (Page 55)

Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 55
Chemical purge
Calibration
values
Measured values
after chemical
exposure
Humidity
Output signal
0507-056
Figure 16 Decrease of Sensor Gain Due to Interfering Chemical
and Effect of Chemical Purge Process
Automatic/Manual Chemical Purge
When HMT310 leaves the factory the automatic chemical purge (if
selected) takes place repeatedly with the time intervals set in the factory.
You can change the interval in which the purge takes place by using
serial commands. This may be necessary if the measuring environment
contains high concentrations of interfering chemicals. The automatic
chemical purge can be also turned off if necessary.
Automatic Chemical Purge Settings
PUR Turn ON/OFF Automatic Chemical
Purge
This command enables or disables automatic chemical purge.
Syntax: PUR x
Where
x = ON/OFF