GE PM880 Operations & Installation Manual page 24

August 2003
Moisture/Temperature Probe
Considerations (cont.)
Observe the following environmental precautions.
a. Temperature Range
The standard probe is operable from -110°C to +70°C (-166°F to
158°F).
b. Moisture Condensation
Be sure the temperature is at least 10°C higher than the dew/frost
point temperature. If this condition is not maintained, moisture
condensation could occur on the sensor or in the sample system,
which will cause reading errors. If this happens, dry out the probe
following the procedures outlined in Appendix A, Application of
the Hygrometer.
c. Static or Dynamic Use
The sensor performs equally well in still air or where
considerable flow occurs. Its small size makes it ideal for
measuring moisture conditions within completely sealed
containers or dry boxes. It will also perform well under gas flow
conditions as high as 10,000 cm/sec and liquid flow conditions to
10 cm/sec. Refer to Appendix A, Application of the Hygrometer,
for maximum flow rates in gases and liquids.
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.
2-4 Initial Setup