Vaisala HUMICAP HMW90 SERIES, Quick Manual, Page: 10 / 118

8
General Wiring Instructions
When wiring, observe the terminal label on the
mounting base. Maximum wire size is 2 mm
2
(AWG14).
You can bring the cable
to the housing from
above or from
behind (recommended).
If you are wiring a
GMW90 series
transmitter from above,
use a < Ø 5 mm cable,
and route it from the
left side of the
mounting base.
Wiring HMW92
HMW92 is loop powered. You must connect the RH
channel of the HMW92, even if you only want to
measure temperature. Connecting the T channel is
optional.
-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
Minimum supply voltage depends on loop resistance:
10 ... 28 VDC at 0 Ω load, 20 ... 28 VDC at 500 Ω load.