McDonnell & Miller 354106 Probe

Ensure reliable low-water detection with the McDonnell & Miller 354106, a 2-1/4" short electrode designed specifically for your 157-RBP series and 157S-RBP combination pump controllers. This conductance probe, also identified as model EA-157-S, serves as a high-precision sensor for detecting boiler water levels via electrical conductivity. Built for the rigorous demands of industrial and commercial steam systems, this 354106 probe features a durable stainless steel rod and a robust insulator to withstand high-pressure environments up to 150 psi. As a short electrode, it is often utilized as the primary sensing element to trigger burner cut-off or pump activation when levels fall below the threshold. Replacing fouled or scaled probes with this OEM McDonnell & Miller part is essential for maintaining the integrity of your boiler safety controls, preventing nuisance shutdowns, and ensuring accurate secondary low-water fuel cut-off (LWCO) functionality in complex hydronic configurations.

• Precision Detection: Optimized 2-1/4" length for pinpoint level accuracy in 157S-RBP-MD controllers.
• High-Pressure Ready: Engineered to maintain a reliable seal and signal at operating pressures up to 150 psi.
• Direct Compatibility: Seamlessly replaces the EA-157-S short electrode in existing McDonnell & Miller level control modules.
• Industrial Durability: Conductance technology eliminates mechanical failure points common in traditional float-style sensors.

Is the EA-157-S probe compatible with the 150S series?
No, this specific electrode is designed exclusively for the 157-RBP and 157S-RBP series with integral sensing probe capabilities. Always check your controller's identification plate for the "RBP" designation.

Does this probe require regular maintenance?
Yes, in high-makeup water applications, scale and mineral deposits can insulate the probe. Technicians should inspect and clean the stainless steel electrode annually to ensure proper signal conductivity.

Can I use Teflon tape on the probe threads?
It is recommended to use a conductive pipe sealant rather than Teflon tape. The probe relies on a solid electrical ground through the boiler casting to complete the sensing circuit.

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.