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Fig. 7. Typical wiring diagram for 5-wire temperature/humidity sensor with Vdc output
CHECKOUT
CAUTION
Equipment Damage Hazard.
Can short electric circuitry.
• Never connect 120 Vac to the transducer.
• Connect only DC voltage to a transducer
intended for DC supply.
NOTE: Use laboratory quality meters and gauges for
applications requiring a high degree of
accuracy.
1. Verify that the transducer is mounted in the correct
position.
2. Verify appropriate input signal and voltage supply.
3. Verify appropriate configuration range.
Problem
No reading
• Verify correct supply voltage at the power terminal blocks.
• Verify correct wiring configuration and DIP switch settings per Figures 2 and 3.
• Verify that terminal screws are connected tightly with all wires firmly in place.
Erratic readings
• Verify all wires are terminated properly.
• Ensure that there is no condensation on the board.
• Verify clean input power. In areas of high RF interference or noise, shielded cable can be
necessary to stabilize signal.
Inaccurate
• If you suspect that the transmitter is not reading within the specified tolerance, please contact
readings
the factory for further assistance
1
2 3 4 5 6 7 8
24 VAC
+
-
24 VAC
COM
(used with the Spyder controller).
Table 2. Troubleshooting.
H7625B, H7626B, H7635B,C H7636B, H7655B, H7656B
HUMIDITY SENSOR
4-20mA VIN
COM VOUT
2
2
2 2 2 2 2 2 2 3 3 3
3
3
3
1 2 3 4 5 6 7 8 9 0 1 2
3
4
5
1 1 1 1 1 1 1 1 1 1 2
9 0 1 2 3 4 5 6 7 8 9 0
Converting Output Signal to
Percent RH
4 to 20mA Signal
((mA signal) -4) / 0.16 = percent RH
Example: 12mA output signal
(12-4) / 0.16 = 50% RH
0 to 5 Vdc Signal
(VDC signal) / 0.05 = percent RH
Example: 1.25vdc output signal
1.25 / 0.05 = 25% RH
0 to 10 Vdc Signal
(VDC signal) / 0.10 = percent RH
Example: 7.50vdc output signal
7.50 / 0.10 = 75% RH
Items to Check
5
+TEMP
3
3
3
3
4
6
7
8
9
0
M31268
62-0330—01
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