Vaisala HMW90 - Manual (Page 31)

Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 29
Wiring
Connect the wiring to the screw terminals on the mounting base. The
supply voltage and terminal assignments are model-specific. Max wire
size 2 mm 2 (AWG14).
After completing the wiring, connect the transmitter body over the
mounting base. Note that mounting bases are model-specific.
WARNING Connect only de-energized wires.
NOTE When wiring the transmitter, make sure the electrical conduit or cable is
not supplying air from outside the room into the transmitter. Seal the
cable opening if necessary.
Wiring HMW92
You must connect the RH channel of the HMW92, even if you only want
to measure temperature. Connecting the T channel is optional.
1111-067
Figure 12 Wiring HMW92
If you want to use a single power supply for the HMW92, you must
connect the positive terminals (+T and +RH) together.
1211-007
Figure 13 Three-Wire Wiring for HMW92
-T -RH +T +RH
Power supply
10 ... 28 VDC
R
L
= 0 ... 600 Ω
Power supply
10 ... 28 VDC
R
L
= 0 ... 600 Ω
mA
mA
-T -RH +T +RH
mA
mA
Power supply
10 ... 28 VDC
R
L
= 0 ... 600 Ω