McDonnell & Miller P-6-SS Probe Rod

The McDonnell & Miller 179555, model P-6-SS, is a 72-inch liquid level control probe engineered for high-precision monitoring in industrial and commercial boiler systems. Constructed from premium 316 stainless steel, this probe rod is designed for high-demand environments where corrosion resistance is non-negotiable. The full length of the rod is encased in a high-grade PTFE coating (Teflon), an essential technical feature that prevents "bridging" or false signals caused by scale buildup or moisture across the insulator. This ensures the conductance liquid level sensor maintains an accurate circuit with the boiler water at all times.

As a veteran's choice for RS series sensors, the P-6-SS is a direct replacement component compatible with PCH, PCL, and LPC-2000 series liquid level controls. For field installations, this 72-inch rod can be cut to a specific length to match the precise "low water" or "pump on" elevations required by the system's manifold or tank depth. When replacing an existing McDonnell & Miller probe, ensure the threads are clean and avoid using standard pipe dope that could interfere with the electrical conductivity required for the low water cut-off to function properly.

• High-Grade Durability: The 316 stainless steel construction provides superior resistance to chemical treatments and thermal cycling in steam applications.
• Signal Integrity: The PTFE coating eliminates false-positive readings by ensuring the electrode only detects the liquid level at the exposed tip.
• Versatile Field Integration: The 72-inch length allows for custom trimming, making it a universal solution for deep tanks and 179555 replacement probe needs.
• System Compatibility: Explicitly designed to integrate with McDonnell & Miller RS Sensors and high-performance level controllers.

Can the P-6-SS probe rod be cut to a shorter length?
Yes, as a veteran technician would tell you, these 72-inch rods are designed to be field-cut to the specific requirements of your application. Ensure you deburr the cut end to maintain a clean sensing surface.

What is the purpose of the 179555's PTFE coating?
The Teflon coating acts as an insulator. It prevents the controller from getting a "ghost" signal if water splashes or scale builds up on the rod above the actual water line, which is critical for preventing dry-firing.

Which controllers work with this probe?
The P-6-SS is primarily used with RS series sensors and is the standard technical match for LPC-2000, PCH, and PCL liquid level control systems.

This item is not eligible for free shipping.

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.