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Chapter 4 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 127
4. Press EXIT to return to the basic display.
0706-004
Figure 67 Performing Chemical Purge
Using Serial Line
PURGE
Enter the PURGE command to start chemical purge immediately.
>purge
Purge started, press any key to abort.
>
The prompt '>' appears when the heating period is over. However, the
transmitter outputs are locked to the values measured before performing
chemical purge until the settling time is over.
With PUR command you can enable or disable automatic and power-up
chemical purge and set the interval for automatic purge. If the sensor is
exposed to chemicals it is recommended to have the chemical purge done
at least once in 720 min (=12 hours). In applications where the chemical
exposure is not likely, the interval can be longer.
It is not recommended to change duration, settling, temperature or
temperature difference.
PUR
Type PUR and press ENTER to proceed. The maximum interval is
14400 minutes (=10 days).
Example:
>pur
Interval Purge : OFF ?
Interval : 720 min ?
Power-up Purge : OFF ?
Duration : 120 s ?
Settling : 240 s ?
Temperature : 160 'C ?
Temp. diff. : 0.5 'C ?
>
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