Rh Conversion Formulas - Carrier SPS Installation Manual

Relative Humidity sensors
Decrement RH
Output
Reset to
Original
Calibration

RH conversion formulas

Use the following table to convert transmitter output signal to %RH.
Output
4-20 mA
4 mA = 0% RH
20 mA = 100% RH
0-10 Vdc
0 Vdc = 0% RH
10 Vdc = 100% RH
0-5 Vdc (#OPNSENSRH-01 only)
0 Vdc = 0% RH
5 Vdc = 100% RH
48
Allows calibration of the sensor through imbedded calibration
software. Toggle the #1 switch from Off to On to Off again for a
decrease of 0.5% RH.
To correct a 1% drift, perform the above toggle sequence
EXAMPLE
twice.
This is a single point calibration and is not recommended for
NOTE
critical applications. Contact the factory before doing any field
calibration.
Resets the transmitter to its original factory calibration. Turn switch
#1 and #2 On for a minimum of 5 seconds and then off again.
EXAMPLE:
If signal output is...
12 mA
8 Vdc
2 Vdc
Calculation is...
(12mA-4mA)/0.16 = 50% RH
8 Vdc/0.10 = 80%RH
2 Vdc/0.05 = 40% RH
Carrier Sensors