Vaisala HUMICAP HMT330 SERIES Guía de usuario Pagina 139

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Chapter 4 ________________________________________________________________ Operation
VAISALA ______________________________________________________________________ 137
Example (no data logger module installed):
>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 ?
>
Example (with data logger module installed):
>pur
Interval Purge : OFF ?
Interval : 720 min ?
Next Purge date: 2011-02-09 ?
Next Purge time: 12:00:00 ?
Power-up Purge : OFF ?
Duration : 120 s ?
Settling : 240 s ?
Temperature : 160 '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
Sensor Heating
This function is optionally available only in transmitters with
HUMICAP®
180C or HUMICAP®180RC sensor. It should be used only
with the warmed probe.
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.
Sensor heating starts-up when the relative humidity of the measuring
environment reaches the RH-value set by a user (RH-limit). The user can
define the RH-sensor heating temperature as well as the duration of the
heating.
After the heating cycle the humidity conditions are checked and new
sensor heating is performed if the predefined conditions are reached
again.
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