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Relative Humidity sensors
Carrier Sensors
CARRIER CORPORATION ©2021
Installation Guide
All rights reserved
61
Calibrating and troubleshooting relative humidity sensors
Troubleshooting the RH sensor
No reading
Verify that:
•
You have the correct supply voltage at the power terminal blocks.
•
The wiring configuration and DIP switch settings are correct.
•
All terminal screw connections are tight and that all wires are firmly in place.
Erratic
readings
Verify that:
•
All wires are terminated properly.
•
The board does not have condensation on it.
•
The input power is clean. In areas of high RF interference or noise, shielded cable may be
needed to stabilize the signal.
Inaccurate
readings
If you suspect the transmitter is not reading within the specified tolerance, contact the factory
for assistance.
Using SW1 DIP switches to calibrate and troubleshoot
This is a single point calibration only
. All transmitters are factory-calibrated to meet/exceed published
specifications. Field adjustment should not be necessary.
The DIP switch allows you to calibrate the sensor through software. Setting DIP switch 4 ON puts the transmitter
into setup mode, allowing the increment and decrement to work. Once in setup mode, the output changes to 50%
(5V for 0-10V, 12mA for 4-20mA). Each increment or decrement step causes the output to change by 0.2V for 0-
10V, and 0.32mA for 4-20mA in setup mode. This shows how far offset the transmitter is. To see the starting point
again, set DIP switch 1 to ON. This shows the 50% output again. When the unit is out of setup mode, the output
returns to RH output.
When all calibration is completed, remember to place the switches back into positions that correspond to the
output needed.
Normal
Operating
Condition
Setting DIP switch 4 ON puts the transmitter into setup mode. Once
in setup mode, the output changes to 50% (5V for 0-10V, 12mA for
4-20mA).
0% RH Output
Transmitter outputs a 4 mA or 0 Vdc signal regardless of sensor
reading. (For troubleshooting only.)
50% RH
Output
Transmitter outputs a 12 mA, 2.5 Vdc, or 5 Vdc signal regardless of
sensor reading. (For troubleshooting only.)
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