Appendix A. Measurement Considerations
178 Model PM880 Portable Hygrometer User’s Manual
A.2 Moisture/Temperature Probe Considerations (cont.)
d. Pressure
The moisture probe directly measures water vapor pressure. The moisture
sensor measures water vapor under vacuum or high pressure conditions
from as little as 5 microns Hg to as high as 5,000 psi total pressure.
e. Long-Term Storage & Operational Stability
Sensors are not affected by continuous abrupt humidity changes, or
damaged by exposure to saturation conditions, even when stored. However,
you should store probes in their original shipping containers in a clean, dry
location. If the probe is saturated during storage, refer to b. Moisture
Condensation on the previous page before installing the probe. For best
performance, do not store probes longer than one to two years from their
calibration date.
f. Freedom from Interference
The sensor is completely unaffected by the presence of a wide variety of
gases or organic liquids. Large concentrations of hydrocarbon gases,
Freon
, carbon dioxide, carbon monoxide, and hydrogen have no effect on
sensor water vapor indications. The sensor will operate properly in a
multitude of gaseous or non-conductive liquid environments.
g. Corrosive Materials
Avoid all materials that are corrosive or otherwise damaging to aluminum
or aluminum oxide. These include strongly acidic or basic materials and
primary amines.
To Next Page
Loading...
