Chapter 3 ______________________________________________________ Functional Description
VAISALA_______________________________________________________________________ 35
The heating control tries to keep Th at +15 °C by adjusting the heating
power. The heater control switches heating resistors on and off based on
heating voltage and Th.
The instant current depends on the heater voltage. You must select the
power supply with the instant current in mind. The average (5s) heating
power and heater performance do not depend on the heating voltage.
When the heating function is disabled, the heating is off in all
conditions. See Supervisor Message on page 144.
Table 2 Heater Resistance
Transmitter model Heater resistance
when Vh < 15 V
Heater resistance
when Vh > 15 V
WXT536
WXT535
WXT533
WXT532
15 57
WXT531 27
NOTE
Snow accumulation can cause temporary wind measurement problems
even when heating is enabled.
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