GE Panametrics M Series Probe

Aluminum oxide moisture-sensor probe for use with all GE Infrastructure Sensing moisture analyzers

GE Panametrics M Series Probe
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Features

  • Manufactured by GE Panametrics
  • Intrinsically safe
  • Superior sensitivity, response speed and calibration stability
  • Optional temperature sensor
  • Calibrations traceable to NIST
  • Designed for in situ applications or in conjunction with sample conditioning systems
  • True absolute humidity sensor
  • Wide dynamic range

GE Panametrics M Series' aluminum oxide moisture-sensor probes have set the standard of performance and value in industrial moisture measurement for more than 40 years. In use, Panametrics M Series moisture probes are coupled to GE Panametrics hygrometer consoles by an interconnecting cable. Ease of use, wide measurement range, and rigorous calibration standards make these systems the preferred choice for industrial moisture measurement worldwide.

Superior Performance

Film thickness of the oxide layer is critical to the performance of this type of moisture sensor. GE Infrastructure Sensing manufactures moisture sensors with an oxide film thickness that causes them to exhibit true absolute humidity (rather than relative humidity response) while minimizing any temperature or hysteresis effects. This critical film thickness also gives the GE Panametrics M Series Moisture-Sensor Probe quick response and exceptional calibration stability.

Rigorous Calibration Standards Traceable to the NIST

Each GE Panametrics M Series aluminum oxide moisture probe is individually calibrated in one of the world's most advanced moisture calibration facilities. Developed over several decades, this facility uses flow, temperature, and pressure measuring devices that are traceable to the National Institute of Standards and Technology (NIST) to generate precisely known moisture concentrations to which each moisture probe is exposed during the calibration process.

All data is gathered and stored by a dedicated computer system. Calibrations are repeated over a period of months to determine the stability of each individual moisture probe. Only those moisture probes that met GE Infrastructure Sensing's demanding specifications for accuracy and stability are shipped to customers.

Theory of Operation in Gases and Liquids

The direct measurement of water vapor pressure is accomplished easily and effectively in both gases and liquids by the Panametrics M Series aluminum oxide moisture sensor. The sensor consists of an aluminum strip that is anodized by a special process to provide 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 gas phase or liquid phase.

Applications for the GE Panametrics M Series Moisture-Sensor Probe

This aluminum oxide moisture-sensor probe from the GE Panametrics M Series measures moisture concentration in gases and non-aqueous liquids from trace to ambient levels. The Panametrics M Series is designed to be used in conjunction with all GE Infrastructure Sensing moisture analyzers for industries including:

  • Petrochemical
  • Natural gas
  • Industrial gas
  • Semiconductor
  • Furnace gas/heat treating
  • Power generation
  • Air dryer
  • Pharmaceutical
  • Aerospace

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