pH Sensors

The right pH sensors for your cooling tower, condensate or waste application.
Lakewood Instruments 5207 pH sensor

We know how it is – you just want your pH sensor to work and not waste your time. We can help you with great sensor care procedures that keep you operating just that way. And when you need a new sensor, we’ve got you covered.

Think you need a new pH sensor? We have just the right sensor glass, connectors, cables, transmitters, body material, etc. for your application.

For cooling towers, you need to choose the right cooling tower pH sensor to match your Lakewood Controller. There are some subtle differences that will prevent compatibility problems.

For a standard Cooling Tower pH:

  • If you are using a Model 1520e pH controller, you want our 1240472 pH sensor with it’s PVC body, BNC connector, and 15′ of cable length.
  • If you are using a Model 1575e or NexSys controller, you want our 1269422 pH sensor with the same PVC body but a SMB connector and 10′ cable length.

For a cooling tower, condensate, or waste application pH sensor for which you want to be specific about the type of glass on the sensor itself, we offer 520 series (BNC connector) and 522 series sensors (SMB connector), which have the options of:


  • standard
  • dome glass
  • high sodium glass
  • pure water glass

Body Materials:

  • PVC
  • 316 SS with optional 10″, 18″ or 48″ body


  • Compression Fitting
  • Retractable Ball Valve

Let’s see: two body materials, three mounting options, four glass electrode choices, two electrical connectors – that can be confusing. Call us and we will simplify the process so you get exactly what you need!

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