McDonnell & Miller RS-1-LP Sensor Probe

The McDonnell & Miller RS-1-LP sensor probe (part number 176203) is a specialized single level low pressure remote sensor engineered for precise liquid level detection in commercial and industrial hydronic systems. Designed for integration with low water cut-off (LWCO) controllers, this unit features a durable 3/4 inch NPT tank connection, ensuring a leak-proof seal within pressurized vessels. The low pressure probe sensor is optimized for environments where standard height clearance is restricted, providing a localized signal to the mother board when water levels drop below the set point. Contractors rely on the RS-1-LP for its high-grade conductivity sensing capabilities, which eliminate the mechanical failures common in float-style switches. This HVAC liquid level control component is critical for preventing dry-fire conditions in boilers and cooling towers. When installing this RS-1-LP remote sensor, ensure the probe length is verified against the tank depth for accurate switching differentials and reliable system protection.

Key Technical Benefits:

• Conductivity Sensing Technology: Provides high-reliability level detection without moving parts that can scale or foul.
• Industrial Build Quality: Features a robust 3/4 inch NPT connection suitable for high-vibration and industrial thermal cycles.
• Remote Mounting Versatility: Allows for flexible installation in tight mechanical rooms where integrated LWCO units cannot fit.
• Broad Compatibility: Seamlessly integrates with McDonnell & Miller Series 750 and other compatible conductance-actuated controllers.
• Application Specific Design: Specifically engineered for low pressure water level sensing to maintain boiler safety standards.

Common Technical Questions:

Can the RS-1-LP probe be cut to a shorter length?
Yes, the probe rod can be field-trimmed to meet specific clearance requirements, provided the integrity of the insulation and the sensing tip remains intact.

What is the maximum pressure rating for this sensor?
The McDonnell & Miller 176203 is rated for low-pressure applications, typically used in systems not exceeding 160 psi at 250°F, depending on the controller pairing.

How do I troubleshoot a false low water signal with this probe?
Inspect the remote sensor probe for mineral buildup or scale, which can insulate the rod and prevent proper continuity. A simple cleaning with a fine abrasive often restores signal accuracy.

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.