Filter
Top Products
Maintenance
RT-SVX20A-E466
To Test Humidity Sensors
Return Air Humidity Sensor ECA RAH/RAE
Outdoor Humidity Sensor ECA OAH/OAE
To test this circuit, place a DC milliamp meter in series with either of the leads to the humidity sensor. If the reading
is 0ma, polarity may be reversed. Reverse + & - and retest. If the reading does not correspond to the table below,
check the output voltage from the ECA with the sensor disconnected. It should be approximately 20VDC. If so, and
all connections are intact, replace the sensor. If 20VDC is not present, yet the ECA green LED is on, the ECA module
has failed.Humidity sensor accuracy : +/-10% RH.
Table 56 - Humidity sensor test
RH% DCma RH%D Cma RH% DCma
100% 20.000 52.6 12.414 31.2 9.000
97.7 19.636 51.7 12.273 30.8 8.926
95.5 19.286 50.8 12.135 30.3 8.852
93.4 18.947 50.0 12.000 29.9 8.780
91.4 18.621 49.2 11.868 29.4 8.710
89.4 18.305 48.4 11.739 29.0 8.640
87.5 18.000 47.6 11.613 28.6 8.571
85.7 17.705 46.8 11.489 28.1 8.504
83.9 17.419 46.1 11.368 27.7 8.438
82.1 17.143 45.3 11.250 27.3 8.372
80.5 16.875 44.6 11.134 26.9 8.308
78.8 16.615 43.9 11.020 26.5 8.244
77.3 16.364 43.2 10.909 26.1 8.182
75.7 16.119 42.5 10.800 25.8 8.120
74.3 15.882 41.8 10.693 25.4 8.060
72.8 15.652 41.2 10.588 25.0 8.000
71.4 15.429 40.5 10.485 24.6 7.941
70.1 15.211 39.9 10.385 24.3 7.833
68.8 15.000 39.3 10.286 23.9 7.826
67.5 14.795 38.7 10.189 23.6 7.770
66.2 14.595 38.1 10.093 23.2 7.714
65.0 14.400 37.5 10.000 22.9 7.660
63.8 14.211 36.9 9.908 22.5 7.606
62.7 14.026 36.4 9.818 22.2 7.552
61.5 13.846 35.8 9.730 21.9 7.500
60.4 13.671 35.3 9.463 21.6 7.448
59.4 13.500 34.7 9.558 21.2 7.397
58.3 13.333 34.2 9.474 20.9 7.347
57.3 13.171 33.7 9.391 20.6 7.297
56.3 13.012 33.2 9.310 20.3 7.248
55.4 12.857 32.7 9.231 20.0 7.200
54.4 12.706 32.2 9.153
53.5 12.558 31.7 9.076