Vaisala HUMICAP HMW90 SERIES - Connecting Common AC Power Supply

User's Guide _______________________________________________________________________
30 ___________________________________________________________________ M211399EN-F
Wiring HMW93
Recommended wiring for long cables:
1111-068
Figure 14 Wiring HMW93
3-wire connection with -Vs as common ground. Maximum cable
resistance is 2.5 Ω (24V supply, 0 ... 10 V output, relay not used).
1111-069
Figure 15 Three-Wire Wiring for HMW93
-T -Vs+T +Vs
Power supply
18 ... 35 VDC
or 24 VAC ±20%
-RH +RH
V
V
Relay
max. 50 VDC
500 mA
R
L
= 10 kΩ min.
-T -Vs+T +Vs
Power supply
18 ... 35 VDC
or 24 VAC ±20%
-RH +RH
V
V
Relay
R
L
= 10 kΩ min.