Moisture Analyzer

1. Moisture Analyzer

2. The direct measurement of water vapor pressure is accomplished easily and effectively in
both gases and liquids by the Moisture Image Series aluminum oxide moisture sensor.
The sensor consists of an aluminum strip which is anodized by a special process to a
porous oxide layer over which a very thin coating of gold is evaporated. The aluminum
base and the gold layer form the two electrodes of what is, essentially, an aluminum
oxide capacitor.
Water vapor is rapidly transported through the gold layer and equilibrates on the pore
walls of the oxide layer. The number of water molecules absorbed on the oxide structure
determines the conductivity of the pore walls. Each value of pore wall resistance provides
a distinct value of electrical impedance which in turn is functionally related to the water
vapor pressure. This functional relationship holds for measurements made in either the
gas phase or the liquid phase.

3. Built-in pressure and
temperature measurement.
Accurate determination of many moisture measurement parameters requires
knowledge of the process temperature and pressure. We’ve eliminated the
inconvenience and limitations associated with installing and using separate
temperature and pressure sensors by providing the option of building that
capability directly into the Moisture Image Series Probe. A nonlinear NTC
thermistor to measure temperature from –30° to 70°C and a choice of five
solidstate piezoresistive transducers, to measure pressures up to 5,000 psig, are
available.

4. Calibration
Each sensor is individually computer calibrated against known moisture
concentrations.
MIS electronics module.
The real power of the MIS Probe comes from an electronics module which
attaches to the moisture sensor probe.
The built-in microprocessor provides 16 bit resolution, a real performance
enhancement, allowing it to detect parts per billion (ppb) changes in moisture
concentration. In addition, it continuously monitors and compensates the
electronics
to assure long-term stability.
For your convenience, moisture probe
calibration data is stored in nonvolatile
EEPROM, so you don’t have to enter it
manually or worry about losing it when
you lose power.