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    AquaMetrix products have been manufactured for more than five decades. The company has grown into a worldwide maker of water quality instrumentation that is known for working in environments where nothing else works. Aquametrix products have been made in the United States since 2010.                          

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P65/R65 Direct 4-20mA Sensors

P65/R65 Direct 4-20mA Sensors


The 65 series pH and ORP sensors are the latest industrial grade sensors based on AquaMetrix’s legendary differential circuity. The 65 series provides an encapsulated 4-20 mA two-wire transmitter to feed directly to a PLC or a DCS. This is available in all our various body sizes including the 1.5″ R8 sensor and the 1″ R5 sensor.



  • Two-Wire Transmitter built in
  • Integral 4-20mA transmitter can be fed directly to a PLC
  • Differential measurement for accuracy and minimization of ground loops
  • Replaceable saltbridge and reference solution for extended life.
  • Built-in pre-amp supports up to 3,000′ sensor-to-analyzer distance
  • Flow-thru or submersible mounting
  • Temperature compensation device
  • Two year warranty


  • Process Control
  • Industrial and Municipal Water Treatment
  • Industrial and Municipal Waste Treatment and Neutralization
  • Fume Scrubbers
  • Plating
  • Circuit Board Manufacturing
  • Food and Beverage
  • Chemical Processing
  • Pulp and Paper
  • Mining
  • Power Generation
  • Pharmaceutical Industry


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