Vaisala HMT330 - Manual (Page 140)

User's Guide _______________________________________________________________________
138 __________________________________________________________________ M210566EN-K
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 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.
NOTE During the sensor heating the outputs are locked to the values measured
before the heating cycle.
Setting Humidity Sensor Heating
When the HMT330 leaves the factory the sensor heating follows the
factory default values. You can enable/disable the function, change the
RH-limit and define the heating temperature and duration of this
function.
XHEAT
Enables/disables the sensor heating.
XHEAT [xx]
where:
xx = ON / OFF
Example:
>xheat on
Extra heat : ON
>xheat off
Extra heat : OFF
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