McDonnell & Miller G-4-SS Probe Rod

The McDonnell & Miller G-4-SS Probe Rod (Part Number 179158) is a high-grade 316 stainless steel grounding electrode engineered for demanding liquid level control applications in steam and hot water boiler systems. This 48-inch remote sensor probe is specifically designed for use with McDonnell & Miller RS sensors, such as those found in Series 750B-C3 and 750B-C4 cast iron chambers. As a non-Teflon ground probe, it provides a reliable electrical reference point in high-pressure environments, capable of withstanding up to 250 psig of steam pressure. This water level control probe is essential for technicians performing maintenance or custom installs where a precise 4-foot length is required for accurate conductance-type level sensing. Its rugged 316 SS construction ensures superior corrosion resistance and long-term signal integrity in harsh industrial and commercial boiler environments. Whether you are replacing a fouled electrode or configuring a new low water cut-off system, this probe rod offers the mechanical durability and electrical conductivity necessary for safety-critical boiler operations.

• Corrosion Resistance: Manufactured from 316 stainless steel to prevent oxidation and ensure reliable signal transmission in boiler water.
• Universal Compatibility: Specifically threaded and tapered for a seamless fit with McDonnell & Miller RS series sensors.
• Versatile Application: Ideal for use in Series 750B chambers for high-pressure remote sensing up to 250 psig.
• Field-Proven Reliability: The 48-inch length provides ample reach for deep-vessel liquid level monitoring without compromising structural rigidity.

Is this probe rod interchangeable with P-series probes?
While both are 316 SS, the G-4-SS is a grounding probe typically used as a reference, whereas P-series probes often feature PTFE coating for specific insulating requirements. Always verify your sensor head configuration (RS vs. others) before installation.

Can I cut the 48-inch rod to a shorter length in the field?
Yes, technicians can trim these rods to size if the application requires a shorter length than the standard 48-inch factory specification, though proper deburring is required to maintain sensor performance.

Does this probe include the sensor mounting head?
No, this is the replacement probe rod only. The RS sensor head and mounting chambers must be sourced separately for a complete liquid level control assembly.

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.