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in_m22.doc
by the total resistance resulting from the addition of the cable resistance and that of the devices
connected in series with the unit. This resistance should not exceed 250 ohms.
RH
T
V+
V+
Base Plate Terminals
Description
1 and 3
2
4
5 and 6
10…35 VDC (+)
temperature output
relative humidity output
not used
Note: it is not necessary to connect both terminals 1 and 3 to the plus side of the power supply. The
transmitter will operate normally with just one of these terminals connected.
Measuring humidity or temperature only: the humidity and temperature circuits of the M22 are
independent one from the other. Any output can be operated without closing the loop for the other
output.
We generally recommend grounding the (-) side of the power supply, especially if the electronics will
be subjected to a low humidity environment (35 %RH or less).
Installation and removal of the HygroClip S probe
Both the HygroClip S and the base of
the connector on the transmitter are
marked with a dot. The locking ring is
marked with 2 dots.
The probe can be inserted straight into
the connector when all dots are aligned.
When the dots are not aligned, the
probe should be rotated clockwise
during insertion.
After inserting the probe, turn the
locking ring clockwise to secure the
probe.
