Hayward W3PRO25-2 Pro Series ORP sensor with 24 inch cableHayward Pro Series ORP Sensor with 24 in. Cable, W3PRO25-2 In stock$42900 Web Price
Hayward W3PRO25-2 Pro Series ORP sensor with 24 inch cable
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Hayward Pro Series ORP Sensor with 24 in. Cable, W3PRO25-2

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Quick overview

  • Factory original Hayward The genuine Hayward replacement sensor, part number W3PRO25-2.
  • Replaces PRO25-2 Supersedes the earlier PRO25-2 part number.
  • 24 in. cable Supplied with a 24 inch cable.
  • 2 year sensor The Pro Series 2 year ORP sensor.
  • For CAT controllers Built for Hayward CAT chemical controllers.
  • ORP measurement Reads oxidation reduction potential, the value the controller uses to judge sanitizer activity.
Full description and specifications ↓

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Product details

The Hayward W3PRO25-2 is the Pro Series 2 year ORP sensor with a 24 inch cable, built for Hayward CAT controllers. It is the factory original Hayward part and it replaces the earlier PRO25-2.

What the sensor does

ORP stands for oxidation reduction potential. It is not a measure of how much sanitizer is in the water but of how hard that sanitizer is working, which is the number a controller needs in order to decide when to feed. The probe sits in a flow cell in the sample line and reports continuously.

When to replace it

ORP probes are consumable. The sensing surface ages, the response slows and the reading drifts, usually gradually enough that the controller keeps dosing to a number that no longer means what it did. If a probe will not hold calibration after cleaning, it is finished. This one is rated as a 2 year sensor.

Specifications
Brand Hayward
Manufacturer part number W3PRO25-2
UPC 0610377389853
Type ORP sensor
Series Pro Series
Sensor life 2 year sensor
Cable length 24 in.
Replaces PRO25-2
Fits Hayward CAT controllers
Shipping weight 1 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Will this replace my PRO25-2 sensor?
Yes. W3PRO25-2 is the current part number and it replaces PRO25-2.
How long is the cable?
24 inches.
Which controllers does it work with?
Hayward CAT controllers.
What does an ORP sensor actually measure?
Oxidation reduction potential, which is a reading of how actively the water is oxidizing rather than how much sanitizer is in it. The controller uses that reading to decide when to feed. When a probe ages, the reading drifts and the controller doses on bad information.
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