Vaisala HMT330 - Manual (Page 138)

User's Guide _______________________________________________________________________
136 __________________________________________________________________ M210566EN-K
- If you have the data logger module installed, you can also specify
the Date and Time when the purge is performed next.
4. Press EXIT to return to the basic display.
0706-004
Figure 69 Performing Chemical Purge
Using Serial Line
PURGE
Use 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.
PUR
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.
If the transmitter has a data logger module installed, you can also set the
starting date and time for the interval purge. After the set time has been
reached, the interval purge will be performed at the set interval. This
functionality can be used to make sure the chemical purge starts at a
specific time of the day.
Do not change the settings for duration, settling, temperature or
temperature difference unless instructed by Vaisala personnel.
Type PUR and press ENTER to proceed. Skip unchanged values by
pressing ENTER. Input changed values in the format shown by the
current value (for example, date and time). The maximum interval is
14400 minutes (=10 days).