Moisture Probe Considerations; Temperature Range; Moisture Condensation; Static Or Dynamic Use - GE moisture.iq User Manual

Chapter 1. Installation

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 BHGE.
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. BHGE 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 105, 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 BHGE document
#916-064, Basic 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 BHGE
document #916-064, Basic Hygrometry Principles, for maximum flow rates in gases and liquids.
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