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Chapter 1. Installation and Wiring
1.5 Moisture Probe Considerations
The M-Series and Moisture Image Series probes consist of an aluminum oxide sensor mounted on a connector head.
Standard probe mounts include a protective stainless steel shield.
The probe sensor materials and housing maximize durability and insure a minimum of water absorbing surfaces in the
vicinity of the aluminum oxide surface. A sintered stainless steel shield is used to protect the sensor from high flow
rates and particulate matter. The end cap should not be removed except upon advice from GE.
The sensor has been designed to withstand normal shock and vibration. You should make sure that the active sensor
surface is never touched or allowed to come into direct contact with foreign objects, since this may adversely affect
performance.
Observing these few simple precautions will result in a long and useful probe life. GE recommends that probe
calibration be checked routinely, at 12-month intervals, or as recommended by our applications engineers for your
particular application.
The probe will measure the water vapor pressure in its immediate vicinity. Therefore, readings will be influenced by its
proximity to the system walls, materials of construction, and other environmental factors.The sensor can be operated
under vacuum or pressure and under flowing or static conditions.
See the following sections for the recommended environmental precautions.
1.5.1 Temperature Range
See "Probe Specifications" on page 101, for details.
1.5.2 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 GE document #916-064, Basic GE Sensing
Hygrometry Principles.
1.5.3 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 up to 10 cm/sec. Refer to GE document #916-064,
Basic GE Sensing Hygrometry Principles, for maximum flow rates in gases and liquids.
moisture.IQ User's Guide
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