McDonnell & Miller P-4-SS Probe Rod

The McDonnell & Miller P-4-SS Probe Rod (Part Number 179545) is a heavy-duty, 48-inch 316 stainless steel probe rod engineered for precision liquid level sensing in demanding boiler environments. Designed as a critical boiler safety device, this probe features a specialized PTFE coating (Teflon) to prevent bridging and ensure accurate conductance signals, especially in systems prone to sediment or scale buildup. It serves as a direct replacement component for RS series sensors and is fully compatible with PCH, PCL, and LPC-2000 series liquid level controls. For contractors managing low water cutoff (LWCO) systems, the high-grade 316 stainless construction offers superior corrosion resistance in both steam and hot water applications. This liquid level control probe is essential for maintaining the operational integrity of high-pressure vessels, providing a reliable electrical path that triggers the burner circuit to de-energize when water levels fall below safe parameters. Integrate this 48" sensor into your secondary level control architecture to ensure consistent, interference-free monitoring.

• 316 Stainless Steel Construction: Provides maximum resistance to oxidation and corrosion in high-heat hydronic environments.
• PTFE (Teflon) Insulation: The PTFE coating eliminates "false positives" by preventing conductive scale or moisture from creating a bridge between the probe and the boiler shell.
• Extended 48-Inch Length: Designed for deep-well sensing, allow for precise height adjustments tailored to specific boiler vessel requirements.
• Multi-System Compatibility: Engineered to work seamlessly with RS series sensors and McDonnell & Miller primary or secondary liquid level controls.
• Industrial-Grade Reliability: Maintains signal continuity for conductance-actuated controls in steam boiler applications.

• Can the probe be cut to a shorter length? Standard McDonnell & Miller probe rods are often field-cut by technicians to match the specific low-water cutoff point of the vessel; however, ensure the PTFE coating remains intact at the sensing point to avoid signal grounding.
• What systems use the 179545 probe? This specific rod is typically utilized in RS series sensors found in commercial steam boilers and large-scale hydronic heating systems.
• Is the PTFE coating necessary for all applications? PTFE is vital in steam systems where mineral buildup can cause "ghosting" signals, ensuring the sensor only reads actual water levels.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.