Flow Switch – Johnson Controls F61TB-9100 (F61 / F261 / FS-80 Series)

The Johnson Controls F61TB-9100 Flow Switch is a reliable and high-performance flow detection device designed for HVAC and industrial fluid control applications. Belonging to the proven F61 / F261 / FS-80 series, this flow switch is engineered to monitor liquid flow in piping systems and provide dependable protection for critical equipment.

Designed for use in chilled water, hot water, and refrigeration systems, the device helps ensure safe operation of pumps, chillers, and heat exchangers by detecting the presence or absence of flow. When flow conditions fall outside acceptable limits, the switch triggers a control signal to protect system components from damage due to low or no flow conditions.

Manufactured by Johnson Controls, a global leader in building automation and HVAC control solutions, the F61TB-9100 is built for durability, accuracy, and long service life in demanding commercial and industrial environments.