Vaisala PTU300 Guía de usuario Pagina 117

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Chapter 4 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 115
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
temp. difference.
PUR
Type PUR and press ENTER to proceed. The maximum interval is
14400 minutes (=10 days).
Example:
>pur
Interval Purge : ON ?
Interval : 600 min ?
Power-up Purge : OFF ?
Duration : 60 s ?
Settling : 240 s ?
Temperature : 180 'C ?
Temp. diff. : 0.5 'C ?
>
NOTE
To activate the new interval settings immediately, reset the
transmitter.
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
Setting Sensor Heating
This function is optionally available only in transmitters with
HUMICAP
®
180 C sensor. It should be used only with the warmed
probe head.
The sensor heating is recommended for the high humidity
environments where even a small temperature differences can cause
water to condense on the sensor. The sensor heating speeds up the
recovery of the humidity sensor from condensation.
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