Vaisala HMP155 - Manual (Page 49)

Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 47
Starting and Configuring Chemical Purge
In this section, the function and use of the chemical purge option is
explained.
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.
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 : 240 s ?
Settling : 240 s ?
Temperature : 180 'C ?
>
CAUTION Do not modify the Duration, Settling, and Temperature settings unless
instructed to do so. The sensor element may be permanently damaged
from overheating.
NOTE To activate the new interval settings immediately, reset the probe.
NOTE When chemical purge in power-up is enabled, wait about 6 min after
power-up before taking measurements. The output channels are locked
for the first operation minutes to the initial measured values.