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16. Maintenance
If your Humidity transmitter will be used in a dusty environment, the
protective sensor filter, if clogged, may be removed for cleaning.
Unscrew the protective cover and gently blow compressed air through
the filter screen. A soft brush may also be used to remove dirt particles
from the screen.
If the sensor is subjected to 100% condensation, it must be dried to
obtain correct readings. There will be no permanent damage or
calibration shift to the unit.
Units should not be exposed to high concentrations of ammonia or
alcohol vapors.
17. Specifications
Relative Humidity
Measuring Range:
3 - 95% (non-condensing)
Accuracy:
±2.5% @ 72ºF with an added temperature
coefficient error of -.06% RH/ºF (both
increasing and decreasing in temperature).
Repeatability:
± 1 % RH
Operating
Temperature Range:
-20 to 75ºC (-4 to 167ºF)
Output:
Model: HX93AC
4 to 20 mA (Scaled for 0 to 100% RH)
Model : HX93AV
0 to 1 Vdc (Scaled for 0 to 100% RH)
Power:
6 –30 Vdc @ 20mA
Max Loop Resistance:
Ohms = (V supply – 6 V)/.02 A
RH Time Constant (90%
response at 25ºC, in
moving air at 1m/s):
>10 seconds, 10 to 90% RH
>15 seconds, 90 to 10% RH
Sensor Type:
Thin Film Polymer Capacitor
Temperature
Measuring Range:
-20 to 75ºC (-4 to 167ºF)
Accuracy:
± 0.6ºC (1ºF)
Repeatability:
± 0.3ºC (0.5ºF)
Output:
Model: HX93AC
4 to 20 mA (Scaled for 0 to 100% RH)
Model : HX93AV
0 to 1 Vdc (Scaled for 0 to 100% RH)
Power:
No Displays
6 -30 Vdc @ 20mA
With Displays
12 - 30 Vdc @ 30mA
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HX93A, HX93DA SERIES
RH/Temperature Transmitter