GE Panametrics Moisture Probe
GE Panametrics Moisture
Probe
This moisture probe is
also known as ALUMINIUM OXIDE MOISTURE SENSOR. An Aluminium probe is chemically treated to
form a thin porous coating of aluminium oxide. The aluminium oxide is then
coated with a thin, permeable layer of gold. . The gold layer and the aluminium
probe form the anode and cathode. The gold layer is permeable to moisture and
conductive. This forms the second electrode of a capacitor. The pores in the
aluminum oxide layer absorb moisture from the gas stream in amounts directly
proportional to the moisture content of the gas stream. The absorption of water
molecules changes the capacitance of the sensor. The capacitance of the sensor
is measured which is then converted to the moisture value. The radiuses of the
pores in aluminium oxide layer make the sensor specific to water molecules.
Types of Panametrics moisture probes
1. M Series - Moisture and Temperature measurement
2. TF Series - Moisture, Temperature and pressure
measurement
3.MISP Series -
Moisture, Temperature and pressure measurement
M
Series
M1 Probe Mount
o
Flange type probe mount with viton o-ring
•
Used in applications like duckwork where
you can’t tap a hole for 3/4” NPT or 3/4” straight thread
o
4
pins :
•
2 for Al2O3 sensor
•
2 for optional thermistor for
temperature measurement
M2 Probe Mount
o
3/4”-16 straight thread with viton
o-ring
o
4 pins :
•
2 for Al2O3 sensor
•
2 for optional thermistor for
temperature measurement
M9 Probe Mount
o
1” VCR compatible VCR gland
o
Requires VCR metal gasket
o
4 pins :
•
2 for Al2O3 sensor
•
2 for optional thermistor for
temperature measurement
o
Use W or R type shield. Can remove shield for installation
TF
Series (Triple Function)
TF-2 Probe Mount
o
3/4”-16 straight thread with viton
o-ring
o
8 pins :
•
2 for Al2O3 sensor
•
4 pins for optional pressure transducer
for pressure measurement
•
2 for optional thermistor for
temperature measurement
TF-9X Probe Mount
o
1” VCR compatible VCR gland
o
Requires VCR gasket
o
8 pins :
•
2 for Al2O3 sensor
•
2 for optional thermistor for
temperature measurement
•
4 pins for optional pressure transducer
for pressure measurement
MISP
Series (Moisture Image Series Probe)
MISP Probe
o
Combination of TF-Probe and MISP module
•
TF probe can be either TF-2 or TF-9
mount
o
Simple twisted pair probe cable
o
MISP module retains sensor calibration
data
o
Incorporates 16bit A/D converter
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