Vaisala hmdw110 series - Wiring HMDW110; Wiring Devices with Analog Output; Wiring Both Current Loops with a Single Power Supply

Wiring HMDW110
Wiring Devices with Analog Output
HMDW110 series transmitters are designed for a supply voltage range of 10 ... 28 VDC. The
minimum required voltage depends on the loop resistance (0 ... 600 Ω) as shown below.
Supply voltage (VDC)
Loop resistance (Ω)
600
0
0
20
28
10
300
Operating
region
Figure 5 HMDW110 Supply Voltage Operating Region
With HMDW110 transmitters ordered with analog output, you must always connect the
humidity measurement current loop (HUM, terminals 5 and 6) to power the transmitter.
Connecting the temperature measurement current loop (terminals 7 and 8) is optional.
8 T -
7 T+
6 HUM-
5 HUM+
A
+
-
A
Power supply
+
-
Power supply
2 x 4 ... 20 mA
R
L
= 0 ... 600 Ω
Figure 6 HMDW110 Wiring, Analog Output
Wiring Both Current Loops with a Single Power Supply
8 T -
7 T+
6 HUM-
5 HUM+
A
A
+
-
Power supply
2 x 4 ... 20 mA
R
L
= 0 ... 600 Ω
Figure 7 HMDW110 Wiring with Single Power Supply
14 M211692EN-C