McDonnell & Miller 354107 Probe

The McDonnell & Miller 354107, also identified as the EA-157-L long electrode, is a high-precision conductance probe engineered specifically for Series 157-RBP and 157S-RBP low water cut-off and pump controller systems. Measuring 3 inches in length, this stainless steel electrode serves as a critical sensing component for monitoring fluid levels in steam boiler applications where reliable bi-level pump control is required. Designed with a 3/4" NPT threaded connection, the probe ensures a pressure-tight seal and straightforward integration into existing control heads. As a direct OEM replacement part, it maintains the precise electrical sensitivity necessary to trigger burner circuits and pump starters, preventing dry-fire conditions and ensuring optimal water levels in commercial and industrial piping systems. This rugged boiler water level sensor is built to withstand high-temperature environments and turbulent water conditions common in high-pressure boiler operations, providing technical accuracy for contractors prioritizing system uptime and safety redundancy.

• OEM Compatibility: Exact replacement for McDonnell & Miller 157-RBP and 157S-RBP series controllers to ensure seamless fitment.
• Conductance Precision: 3-inch EA-157-L probe provides accurate bi-level sensing for consistent pump and burner control.
• Durable Construction: High-grade materials designed to resist corrosion and sediment buildup in harsh steam environments.
• Standardized Threading: Features a 3/4" NPT connection for a secure, leak-proof installation in the water column.
• Essential Safety: Integral component for maintaining low water cut-off functionality and preventing boiler damage.

Common Questions

Which control series is this probe compatible with?
The EA-157-L is specifically designed for the McDonnell & Miller 157-RBP and 157S-RBP series pump controllers and low water cut-offs.

What is the thread size for the 354107 electrode?
This probe utilizes a standard 3/4" NPT threaded mount for installation into the control body.

Can I use the EA-157-L to replace a short electrode?
No, this is the 3-inch long probe version. For applications requiring the short electrode, you should reference the EA-157-S (354106) to ensure proper switching 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.