Select options for pricing
  • Call for availability



  • Measurement ranges:
    • -100° to 20°C (-148° to 68°F)
    • 0 to 100/1000ppm
  • ±3°C accuracy
  • Aluminum oxide probe
  • Stainless steel weatherproof casing
  • IP65 rated connector


The Servomex SERVOPRO AquaXact 1688 moisture sensor is designed for fast and accurate dew point/ppm H2O measurements of moisture in a wide variety of gas phase process applications such as glove boxes, air separation units, regenerative skid dryers, combustion, and instrument air, with no calibration required after dry-out.

The AquaXact 1688 can function as a standalone 4-20mA transmitter or can remotely interface with an optional digital controller or compatible analyzer. The sensor tip can be replaced by the user and the calibration file loaded to the transmitter using a digital controller, eliminating the need for return-to-factory calibrations. The sensor element is
NIST-traceable and field replaceable, for hassle-free continuous operations.

Key Applications

  • Air separation units
  • Natural gas processing and transportation
  • Glove boxes
  • Instrument air units
  • Ethylene production
  • Refining gases
  • Medical gases
  • Semiconductors
  • Furnace gas/heat treating
  • Power generation
  • Air dryers
  • Pharmaceutical
  • Aerospace