Durafet Non-Glass pH Sensors

Honeywell defines state-of-the-art pH measurement with the Durafet pH electrode, an industrial, non-glass, unbreakable, Ion Sensitive Field Effect Transistor (ISFET)-based pH sensor. This industry-proven pH electrode, with over 14 years of application experience, provides fast, accurate and dependable pH measurement in the most demanding applications. The Durafet electrodes include a connector, enabling easy and reliable electrode replacement without twisting of cables. Durafet III electrodes are designed with a rugged waterproof Vario Pin connector. Durafet II electrodes have a PC board connector. Durafet electrodes offer a reliable combination of measuring and reference electrodes together with an integral automatic temperature compensator in a one-piece construction. The compact industrial Durafet electrodes are available in two basic designs: a ¾" NPT male threaded connection or a 12mm diameter electrode (Durafet II only). The type of design is based on the customer's desired mounting. A sanitary Durafet III design is also available for food and dairy applications.

Durafet electrodes are available for a variety of industrial or sanitary applications:

  • Wastewater influent/effluent monitoring
  • Neutralization
  • Food and dairy quality control
  • Reagent addition control
  • Plating
  • Pharmaceutical



  • Durafey III Vario Pin quick disconnect waterproof cable option
  • Uses ISFET (Ion Sensitive Field Effect Transistor) technology for exceptionally fast response.
  • Non-glass is virtually unbreakable, truly solid state.
  • Stable pH signal over time for less frequent calibrations
  • Cable connector designs for easy electrode installation/replacement
  • Chemically resistant Ryton body
  • KCl gelled reference for long life and reduced maintenance
  • Reference junction frit and gel are replaceable, extending electrode lifetime
  • Low impedance pH signal
  • ¾" NPT mounting design with connections at top and bottom of electrode for in-line or immersion installations
  • Durafet II 12mm diameter body design for use with various Honeywell installation mountings
  • One electrode for entire pH and temperature ranges
  • Can be used with entire Honeywell line of instrumentation: UDA2182, APT Series and DirectLine sensor modules


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