Insite Instrumentation Group, Inc.
Water and Wastewater Quality Instrumentation
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Electrode Replacement Video

pH Sensor


The Model 50 Holder with Model 51 replaceable pH Electrode cartridge comprise the pH sensor, which incorporates embedded electronics, custom geometry, and a field proven cartridge.

  • The embedded electronics in the Model 50 Holder includes a built-in electrically isolated preamp, which results in reliable digital communications up to 2000ft from the analyzer, and temperature compensation circuitry.
  • Our holder's custom geometry incorporates a quick disconnect design that makes for easy cartridge changes, short downtimes, and facilitates the integrated jet clean.
  • Our flat glass / double reference junction construction, yields a field proven cartridge producing long-lasting reliable measurements.

Model 50 Holder

Model 51 pH Electrode with Model 50 Holder

The Model 50 Holder includes all of the electronics to communicate with our continuous analyzers and interface with the cartridge. The internal electronics feature a high quality isolated preamplifier with integrated A/D conversion to maximize noise immunity and extend useful cartridge life. The Model 50 Holder utilizes our standard mount, featuring a PVC 1-½" NPT male mounting thread. The Holder comes standard with tool free 1/4" O.D. tubing connectors for the integrated jet clean, and 33ft (10m) of sensor communications cable. Additional cable length is available upon request.

Model 51 pH Electrode

pH Element and Holder

The M-51 is a cartridge type electrode making replacement simple and easy. The cartridge is sealed into the holder with a reliable double o-ring seal. All replacement electrodes ship complete with o-rings. The threaded TNC connector at the top of the electrode body ensures a reliable electrical connection to the holder.

Flat Surface of pH Element

In the center of the measuring surface is the pH sensitive flat glass. This surface is surrounded by the flat porous reference junction. The large area of this porous junction has thousands of pores allowing for excellent sample contact. The electrode is enclosed by the electrode body. Built into the electrode body is a sealed, gel filled double junction reference half cell. This design adds an extra barrier against contaminants. This also allows the electrode to be used in applications where sulfides, heavy metal ions, and similar materials are present.

See our analyzer selection below to match an analyzer with your needs.

Continuous Analyzers:

Model 50 Holder with Model 51 pH Electrode Model 50 Holder with
Model 51 pH Electrode
  • Measuring Range: 2 to 12 pH
  • Temp. Range: 10°C to 60°C
  • 1-½" MNPT mounting thread
  • 33ft (10m) sensor cable
  • ¼" O.D. tube connection for jet cleaning
Jet Clean Supply Pressures
  • Water 35 to 50 psig
  • Air 40 to 60 psig
Standard Sensor Mounting

Standard Sensor Mounting

See our Setup Videos to find out more about sensor hand rail mounting and self cleaning.