Vaisala HUMICAP HMP155 User's Guide download pdf (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.

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Vaisala HUMICAP HMP155 User's Guide Page 49