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14. Calibration Procedure for HX93AV (all styles)
Relative Humidity Adjustment
Recommended equipment:
• Humidity Calibration Kit, OMEGA
®
Model No.: HX92-CAL
• Handheld Digital Multi-meter, OMEGA
®
Model No.: HHM29B
• Dc Power Supply, OMEGA
®
Model No.: PSU-93
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 unit in a 11% RH environment and allow to stabilize for 15 min.
5. Adjust potentiometer “P3” for a output reading of .110 Vdc.
6. Place unit in a 75% RH environment and allow to stabilize for 15 min.
7. Adjust potentiometer “P2” for a output reading of .750 Vdc.
8. Repeat steps 4, 5, 6, and 7 as necessary until proper readings are
maintained.
9. Calibration complete.
Figure 8 - HX93AV Calibration Procedure
Relative Humidity Adjustment
HHM29
SENSOR HEAD
HX92-CA
CALIBRATION BOTTLE
PSU-93
24V
.750 V
P3
TB1
P1
TB2
P2
+–
uAmA10A
COM
V
132
321
14
HX93A, HX93DA SERIES
RH/Temperature Transmitter