Mcdonnell & Miller G-3-SS Probe Rod

For industrial level-sensing applications, the McDonnell & Miller G-3-SS Probe Rod (Part Number 179157) is a high-grade 316 stainless steel component designed for precision and durability. Measuring 36 inches in length with a standard 1/4" diameter, this conductance-type level sensor probe provides a reliable electrical path for detecting water levels in high-pressure steam and hot water boiler systems. The G-3-SS is a non-teflon coated rod, ensuring maximum conductivity for remote sensor configurations and Ground Probe applications. Field technicians can easily cut the rod to a specific length to meet custom tank or vessel requirements, making it a versatile 179157 replacement part for various low water cut-off (LWCO) assemblies, including the RS-1-BR-1 and the PSE-800 series. Its threaded connection ensures a secure, leak-proof mechanical fit when used with compatible M&M probe housings and liquid level controls. Built for harsh boiler environments, the 316 stainless steel construction resists corrosion and scaling, maintaining signal integrity over long-term operation.

• 316 Stainless Steel Construction: Offers superior corrosion resistance in high-temperature and chemically treated water environments.
• Field-Trimmed Versatility: The 36-inch length can be cut to exact site specifications to match the minimum safe water line.
• High Conductivity: Non-Teflon design ensures a solid electrical ground and reliable sensing for conductance-type controls.
• Broad Compatibility: Directly compatible with McDonnell & Miller 179157 specifications and RS-series remote sensors.
• Standardized Threading: Simplifies installation into existing tapped connections with a 1/4" rod diameter for consistent fitment.

How do I install the G-3-SS probe rod in a steam boiler?
Apply a small amount of pipe sealant to the external threads—do not use Teflon tape, as it can insulate the probe and break the ground circuit. Tighten the probe into the tapped connection to approximately 47 ft-lb, ensuring it remains at least 1/4" away from any internal metal surfaces to prevent shorting.

Can this probe rod be used in demineralized water?
Standard conductance probes require a minimum water conductivity (typically 7,000 ohms sensitivity). Demineralized or distilled water with high specific resistance may require specialized high-sensitivity controls or chemical treatment to ensure the circuit completes reliably.

Is the G-3-SS compatible with other manufacturers' controls?
While designed specifically for McDonnell & Miller RS series and PS-800/850 series controls, this 1/4" stainless steel rod can often serve as a replacement in other conductance-relay systems requiring a 3-foot non-insulated probe.

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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.