Calibration; Relative Humidity Calibration Procedure; Figure 4 Relative Humidity Calibration Procedure - Omega EWS-RH User Manual

EWS-RH
Relative Humidity/Temperature Transmitter

Calibration

Your transmitter has been factory calibrated to meet or exceed the
specifications outlined in this manual. To maintain original
specifications it is generally recommended that your transmitter be re-
calibrated on an annual basis depending on operating conditions.

Relative Humidity Calibration Procedure

Recommended equipment:
Humidity Generator/Calibrator Kit, OMEGA
Handheld Digital Multimeter, OMEGA
1. Remove enclosure cover
2. Connect transmitter as shown in figure below.
3. Apply power to transmitter and allow to warm up for 15 min.
4. Place sensor in a 20% RH environment and allow to stabilize for 20 min.
5. Adjust potentiometer "P1" for a output reading of 7.2 mA
6. Place sensor in a 80% RH environment and allow to stabilize for 20 min.
7. Adjust potentiometer "P2" for an output reading of 16.8 mA
8. Repeat steps 4, 5, 6, 7 as necessary until proper readings are maintained.
9. Calibration complete.
6
Note: Do not make adjustments to potentiometer "P3", this
is a factory setting and is not field adjustable. If "P3" is
disturbed the transmitter will need to be returned to the
factory for service.
P 2
P 1
1
Figure 4: Relative Humidity Calibration Procedure
®
N O T E
2 3 4 5 6
® Model No.: RHCL-KIT
Model No.: HHM29
MULTIMETER
+
16.8 0 m A
–
+
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POWER SUPPLY