McDonnell & Miller FS5-1 Flow Switch 1 Inch Low Flow Rate Sensitivity

The McDonnell & Miller FS5-1 is a reliable flow switch designed to monitor water flow in hydronic heating, cooling, and process systems. This 1-inch NPT flow switch features low flow rate sensitivity, making it ideal for applications requiring detection of minimal flow conditions to ensure proper system operation and protection.

Key Features:

• Low flow rate sensitivity for detection of minimal flow conditions
• 1-inch NPT threaded connection for easy installation
• Rugged brass construction for long-term durability
• Adjustable flow rate setpoint to match system requirements
• SPDT snap-action switch for reliable control circuit operation
• Suitable for water, water-glycol solutions, and other compatible liquids

The FS5-1 provides critical low-flow protection for boilers, chillers, heat exchangers, and other equipment where inadequate flow can lead to overheating or freezing. The adjustable paddle design allows for precise calibration to your specific application requirements. Factory part number 114780.