Hayward CAT Controller Gold ORP Sensor Probe 24 Inch Cable

Hayward CAT Controller Gold ORP Sensor Probe, 24-inch cable (W3PRO25-AU-2). Gold sensing tip for enhanced millivolt stability in high-bather-load and indoor commercial pool applications. Direct replacement for all Hayward CAT and HCC series controllers. 1/2" NPT ABS body, BNC connector. 2-year warranty.

• SKU: W3PRO25-AU-2
• 2-year warranty
• Gold sensing tip: resists surface oxidation and fouling from combined chlorine better than standard platinum
• 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 for standard ORP probe; no controller reconfiguration required
• 1/2" NPT ABS injection-molded body; BNC connector
• Best for indoor pools, therapy pools, high-bather-load commercial facilities, and any installation with recurring combined chlorine challenges
• Do not extend or splice the cable; added impedance distorts the millivolt signal
• Verify against a calibrated portable ORP meter after installation

Hayward CAT Controller Gold ORP Probe (W3PRO25-AU-2): Gold vs. Platinum for Commercial Pool Controls

Gold electrodes resist the surface oxide formation and combined-chlorine fouling that can cause platinum probes to drift off the pool's true ORP value over time. In standard outdoor pools with well-balanced chemistry, platinum performs reliably. In indoor pools, therapy pools, and high-bather-load facilities where combined chlorine accumulates faster, the gold surface maintains reading accuracy longer and reduces calibration frequency. Drop-in replacement for the standard ORP probe; same flow cell port, same BNC connector, no software changes needed.

24-Inch Cable: Is It the Right Length?

Measure the actual routed cable path from the flow cell ORP port to the controller's ORP input terminal before ordering. The 24-inch version suits installations where that distance is 18 to 22 inches with a few inches of service slack. If the run is longer, use the 10-foot cable version. Never splice or extend this cable.

Hayward CAT Gold ORP Probe 24-Inch Specifications

Frequently Asked Questions

Why choose gold over the standard platinum probe?

Gold resists the surface oxide layer that forms on platinum in chlorinated water with elevated combined chlorine, which can cause the platinum probe to settle at a millivolt reading that no longer reflects true oxidizing capacity. In demanding environments, gold holds accuracy longer between service intervals.

Is this a drop-in replacement for the platinum ORP probe?

Yes. Same flow cell port threads, same BNC connector, no controller reconfiguration needed. Verify the reading against a portable ORP meter after installation as you would with any probe swap.

Should I replace the pH probe at the same time?

Replacing both probes in a single service visit is the most efficient approach and ensures the full measurement pair is renewed simultaneously.