H7625A, H7635A HUMIDITY/TEMPERATURE SENSORS
62-0208—3
4
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.
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 3. Troubleshooting.
signal [in mA] 4
–
〈
〉
0.16
-------------------------------------------------
percent 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.
