Campbell Scientific HMP50 Temperature and Relative Humidity Sensor - Manual (Page 17)

HMP50 Temperature and Relative Humidity Probe
Shipping Cap
(remove prior
to installation)
Protective Cap
and Filter
9598 RH Chip
FIGURE 6. Exploded View of HMP50 (as shipped)
The offset and gain on the HMP50 electronics can not be adjusted as part of a
recalibration. Replace the RH chip as needed.
8.1 Procedure for Removing RH Chip
1. Unscrew the protective cap.
2. Hold the plastic sides of the RH chip and unplug it.
To prevent scratching, avoid touching the silver RH chip,
and handle the RH chip with care. CAUTION
3. Rinse the RH chip or dispose of the old RH chip.
4. Hold the sides of the rinsed or new chip and plug it in.
5. Screw on the protective cap.
9. References
Goff, J. A. and S. Gratch, 1946: Low-pressure properties of water from -160°
to 212°F, Trans. Amer. Soc. Heat. Vent. Eng., 51, 125-164.
Lowe, P. R., 1977: An approximating polynomial for the computation of
saturation vapor pressure, J. Appl. Meteor., 16, 100-103.
Weiss, A., 1977: Algorithms for the calculation of moist air properties on a
hand calculator, Amer. Soc. Ag. Eng., 20, 1133-1136.
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