HU-224/225 humidity transducers with VDC output are field selectable 0–5 VDC or 0–10 VDC output and can be powered with either 12–40 VDC or 12–35 VAC.
The following describes the proper wiring of these humidity transducers with VDC output:
Wiring HU-224/225 Units with VDC Output
1. Remove the terminal block by carefully pulling it off the circuit board.
2. Locate the [+], [-] and [O] terminal markings on the board.
3. Attach the power wires to the [+] and [-] terminals. The [-] terminal is also the negative output terminal.
4. Connect the [O] terminal, which is the positive VDC output terminal, to the controller’s input terminal.
5. Re-insert the terminal block to the circuit board and apply power to the unit.
6. Check the appropriate VDC output using a voltmeter set on DC volts across the [O] and [-] terminals.
TYPICAL APPLICATIONS (wiring diagrams)
Model HU-224/225
Technical Information
TI.224/225-08
HUMIDITY SENSOR
Page 3 of 4
HU-224
DUCT MOUNT
0 to 10 VDC (default)
0 to 5 VDC
HU-225
WALL MOUNT
0 to 10 VDC (default)
0 to 5 VDC
1
2
O N
1
2
O N
VDC Output
Signal
+
Common
Supply
Neutral
Hot
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only
12–35 VAC Transformer
Figures 3 & 4
illustrate typical wiring diagrams for the HU-224/225, 0–5/0–10 VDC output humidity transducers.
Figure 3 –
Wiring for VDC Output when applied with External AC Supply.
Figure 4 –
Wiring for VDC Output when applied with External DC Power Supply.
Signal
+
Common
Supply
O
Input Signal
+
Common
+
Shield/Ground
Controller / Meter / Recorder
VDC Output Transducer Only
12–40 VDC Power Supply
RoHS
0 to 10 VDC
(
Factory Default
)
1
2
O N
1
2
O N
HU-224 (Duct Mount)
Board Layout
HU-225 (Wall Mount)
Board Layout
0 to 10 VDC
(
Factory Default
)
Figure 5 –
Dip Switch Settings for HU-224/225 VDC Output
S Z
ON
1
2
SPAN
ZERO
0
-
+
ZERO
SPAN
Z S
+
-
0
ON
1
2
