Vaisala HMT310 - Manual (Page 58)

USER'S GUIDE____________________________________________________________________
58 __________________________________________________________________ M210619EN-D
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.
NOTE During the sensor heating the outputs are locked to the values measured
before the heating cycle.
NOTE The maximum operation voltage for device with sensor heating is 24
VDC.
Setting Humidity Sensor Heating
When HMT310 leaves the factory the sensor heating follows the factory
default values. You can enable or disable the function, change the RH
limit and define the heating temperature and duration of the heating
period.
Sensor Heating ON/OFF
Enables or disables the sensor heating.
Syntax: XHEAT x
Where
x = ON/OFF (default = OFF)
>xheat on
Extra heat : ON
>xheat off
Extra heat : OFF
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