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H7625B; H7635B,C; H7655B DUCT-MOUNT AND OUTDOOR-MOUNT HUMIDITY/TEMPERATURE SENSORS
5 63-2579—3
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 the transducer is mounted in the correct posi-
tion.
2. Verify appropriate input signal and voltage supply.
3. Verify appropriate configuration range.
Converting Output Signal to Percent RH
4 to 20mA Signal
Example: 12 mA output signal
(12 - 4)/ 0.16 = 50% RH
0 to 10 Vdc Signal
Example: 8 VDC transmitter signal output
8 Vdc/0.10 = 80% RH
Table 2. Troubleshooting.
signal [in mA] 4–〈〉
0.16
------------------------------------------------- p er ce nt RH=
Problem Items to Check
No reading • Verify correct supply voltage at the power terminal blocks.
• Verify correct wiring configuration and DIP switch settings.
• 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.