User's Guide ________________________________________________________
34 _____________________________________________________ M210283en-A
The dew heater prevents the formation of condensation on
the optic surfaces. It keeps the sensor temperature above the
ambient temperature. If the dew heater has been activated,
the automatic heater control system will turn on the heater
when the temperature inside LM21 drops below 10 °C. The
heater is automatically turned off when the outside
temperature rises above 12 °C.
If no current runs through the heater when it is in the ON
state, a DEW HEATER FAULT indication is generated.
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