Hayward CAT Controller ORP Sensor Probe 24 Inch Cable

Hayward CAT Controller ORP Sensor Probe, 24-inch cable (W3PRO25-2). OEM replacement ORP electrode for Hayward CAT and HCC series chemical automation pool controls. 1/2" NPT ABS body, BNC connector. 2-year warranty. For compact equipment rooms where the controller and flow cell are in close proximity.

• SKU: W3PRO25-2
• 2-year warranty
• 24-inch cable for compact equipment rooms where controller and flow cell are in close proximity
• Compatible with CAT1000, CAT3500, CAT4000, CAT5000, CAT5500, HCC1000, HCC2000
• Direct replacement; same BNC connector and port threading as factory-installed probe
• 1/2" NPT injection-molded ABS body
• Verify against a calibrated portable ORP meter after installation; agreement within 10 to 20 mV is acceptable
• ORP setpoint target: 650 mV or above per CDC Model Aquatic Health Code
• Do not extend or splice the cable; added impedance distorts the millivolt signal
• Recommended replacement interval: every 12 to 24 months
• Need a gold tip for demanding environments? See W3PRO25-AU-2

Hayward CAT Controller ORP Probe (W3PRO25-2): ORP Monitoring for CAT and HCC Series Pool Controls

The W3PRO25-2 is the standard ORM replacement probe for Hayward CAT and HCC series chemical automation. The 24-inch cable suits compact installations where the flow cell and controller cabinet are side by side. Measures oxidation-reduction potential continuously; the CAT controller uses this millivolt signal to trigger and shut off chlorine dosing in a closed loop. No adapters or controller reconfiguration required after swap. Install in a flow cell or bypass sample cell on the return line, downstream of filtration and chemical injection.

24-Inch vs. 10-Foot Cable: Which Length Do You Need?

Measure the routed cable path from the flow cell ORP port to the controller's ORP input terminal before ordering. The 24-inch version is appropriate when that distance is 18 to 22 inches with service slack. For longer runs, use the 10-foot version (W3PRO25-10). Never splice or extend this cable.

Hayward CAT ORP Probe 24-Inch Specifications

Frequently Asked Questions

What is the difference between this probe and the 10-foot cable version?

The sensing element, electrode material, and BNC connector are identical. The only difference is cable length. Measure the routed cable path before ordering; use the 10-foot version (W3PRO25-10) if the run exceeds 22 inches.

Does the CAT controller need to be reprogrammed after a probe swap?

No. ORP setpoints and dosing parameters remain in effect. After installation, verify the reading against a portable ORP meter and adjust the controller's ORP offset if a small consistent discrepancy is present.

Should I replace the pH probe at the same time?

Replacing both probes at the same service interval is the most efficient approach and renews the full sensor pair simultaneously.

When should I use the gold tip version instead?

The gold tip (W3PRO25-AU-2) is better suited to indoor pools, therapy pools, and high-bather-load facilities where elevated combined chlorine is a recurring issue. For standard outdoor commercial pools with well-balanced chemistry, this standard platinum version is appropriate.