Product Overview

The Hayward pH Sensor with 24" Cable W3PRO15-2 is a genuine Hayward replacement pH probe designed for accurate pool and spa water chemistry monitoring. This sensor continuously measures pH levels and sends readings to compatible Hayward chemical control systems, helping maintain balanced water, improve swimmer comfort, and support consistent sanitizer performance.

This model is commonly listed as W3PRO15-2 / PRO15-2 and includes a compact 24-inch cable for installations where the controller and flow cell are close together. Hayward identifies this product as a 2-foot cable pH probe designed for commercial pools.

Ideal For

Commercial pool chemical automation
Pool and spa pH monitoring
Hayward CAT controller systems
Hayward HCC automated chemical controller systems
Replacement of worn or aging pH probes
Equipment rooms with short sensor cable runs
Facilities needing real-time pH monitoring
Service professionals maintaining automated chemical feed systems

Key Features

Genuine Hayward Replacement Sensor

The W3PRO15-2 is a factory-original Hayward pH sensor designed for compatible Hayward chemical controller systems.

24" / 2 ft. Cable Included

This model includes a 24-inch / 2-foot cable, making it ideal for compact installations where the probe is located near the controller or flow cell.

pH Monitoring

The sensor measures pool or spa pH levels and transmits readings to the controller for monitoring and chemical feed decisions.

Compatible with CAT Controllers

Listings identify this probe for Hayward CAT controller systems, including CAT1000, CAT3500, CAT4000, CAT5000, and CAT5500 models.

Compatible with HCC Controllers

Retail specifications also list this sensor for compatible Hayward HCC automated chemical controllers.

Heavy-Duty Probe Construction

This sensor is commonly described as a heavy-duty pH replacement probe for chemical controller applications.

1/2" NPT Probe Body

Listings describe the probe body as an injection-molded 1/2" NPT body designed for chemical automation installations.

Helps Maintain Balanced Water

Accurate pH readings help the automation system support proper water balance, swimmer comfort, sanitizer performance, and equipment protection.

Benefits

The Hayward W3PRO15-2 is a practical replacement part for pool operators and service professionals who rely on automated chemical control. A properly functioning pH sensor helps the controller monitor water balance accurately, which can reduce guesswork and support more consistent chemical feed control.

With its compact 24" cable, genuine Hayward fit, and compatibility with CAT / HCC-style chemical controllers, this pH probe is a dependable choice for maintaining automated pool and spa water chemistry systems.

Specifications

What’s Included

Hayward W3PRO15-2 pH sensor probe
24" / 2 ft. sensor cable

Chemical controller is not included.
Flow cell, sensor manifold, fittings, and calibration solutions are not included unless supplied separately by the seller.
Professional installation and calibration by a qualified pool professional is recommended.

Customer-Facing Q&A

What does this sensor measure?

This sensor measures pH in pool or spa water.

How long is the cable?

This model includes a 24-inch / 2-foot cable.

Is this the same as PRO15-2?

Yes. W3PRO15-2 is commonly listed as the open-line version of PRO15-2.

Is this an ORP sensor?

No. This is a pH sensor. ORP sensors are separate parts.

What systems is this compatible with?

This sensor is commonly listed for Hayward CAT controllers and Hayward HCC automated chemical controllers.

Is this a genuine Hayward part?

Yes. This is listed as a genuine Hayward replacement pH probe.

Does this include the controller?

No. This listing is for the pH sensor probe and cable only.

Does this include calibration solution?

No. Calibration solution is not included unless bundled separately by the seller.

Does this sensor need calibration?

Yes. pH sensors should be calibrated according to the controller and sensor instructions for accurate readings.

What is the difference between W3PRO15-2 and W3PRO15-10?

The main difference is cable length. W3PRO15-2 has a 24" / 2 ft. cable, while W3PRO15-10 has a 10 ft. cable.

What is the UPC / barcode?

The UPC / barcode is 610377389839.