McDonnell & Miller RS-4-BR-1 Holder

The McDonnell & Miller RS-4-BR-1 (Part Number 179527) is a professional-grade four-level remote sensor probe holder engineered for precise liquid level management in demanding boiler and hydronic environments. Designed for seamless integration with Xylem level control systems, this assembly features a 2-1/2" NPT tank connection to provide a stable, high-pressure mounting point for multi-level sensing. It is built to withstand rigorous industrial conditions, supporting a maximum pressure of 250 psi and a maximum water temperature of 406°F, making it a standard choice for 750 series LPC-2000 or PCH/PCL control units.

This remote sensor assembly utilizes a NEMA 4X enclosure to protect electrical connections from corrosion and moisture, ensuring reliable signal transmission for low water cut-off and pump control functions. By isolating the probes from the main control unit, it offers technicians superior installation flexibility in tight mechanical spaces. Note that "P" series stainless steel probe rods are required for operation and must be sized according to your specific tank depth. For applications involving probes longer than 36 inches, an S-4 spacer is recommended to maintain alignment and prevent short-circuiting.

• Multi-point water level monitoring with support for up to four independent sensor probes.
• Heavy-duty 2-1/2" NPT connection ensures a leak-proof seal in high-pressure steam and hydronic tanks.
• NEMA 4X rated enclosure provides superior protection against environmental contaminants and wash-down conditions.
• High-temperature resilience rated up to 406°F for reliable performance in extreme boiler cycles.
• Fully compatible with McDonnell & Miller 750 series and LPC-2000 liquid level controllers.

• Which probes are compatible with the RS-4-BR-1? Use McDonnell & Miller "P" series probes, such as the P-1-SS or P-2-SS, which can be custom-cut to meet your specific level requirements.
• Does this holder require a blow-down? This remote sensor design is engineered for low maintenance and generally does not require a blow-down, provided the probes are kept free of scale.
• What controls can be paired with this sensor? It is optimized for use with 750 series, LPC-2000, and P-series liquid level controls for refined multi-level sensing.

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.