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2.6 Constant output probe
The constant output probe HMP110REF is a testing accessory that can be used to check the
transmitter's functions and measurement signal transfer chain all the way to the control
system. The constant output probe does not measure humidity and temperature; instead, it
outputs constant humidity and temperature readings.
The values output by the constant output probe are specified when ordering. These values are
written on an additional label on the probe body.
The procedure for using the constant output probe is simply to replace the original probe for
the duration of the testing.
1. Disconnect the standard probe from the transmitter.
2. Connect the constant output probe to the transmitter.
3. Check that all used outputs (analog, display, serial line) show the correct measurement
values.
4. After checking the outputs, disconnect the constant output probe and reconnect the
original probe.
The transmitter goes to error state for a short time when the probe is changed.
This is normal.
More information
‣ Removing and fastening fixed probe (page 55)
‣ Removing and fastening remote probe (page 56)
2.7 Transmitter parts
Figure 1 (page 12)
shows the main transmitter parts. On the left is a remote probe model
without display, and on the right is a fixed probe model with the optional display.
Chapter 2 – Product overview
11
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