Liquid Flow Switches

Adjustable thermal dispersion liquid flow switches provide reliable flow or no-flow detection of relatively clean non-coating liquids with a specific gravity of 0.4 to 1.2. Offered in two lengths and materials for corrosive media, select the short sensor for horizontal pipes 1/2” to 1 1/2”, and the long sensor for horizontal pipes 2” and up. What are thermal dispersion liquid flow switches and how do they work? The liquid flow switches have two temperature probes on the tip of the sensor. One probe heats the liquid and the other probe measures the liquid temperature. When liquid flows past the sensor tip, it reduces the temperature of the heated probe, which in turn, reduces the temperature differential between the two probes. As the liquid flow slows or stops, the opposite occurs, which the liquid flow switch detects and inverts its relay. The switch point is set with the integral adjustment knob and LED flow indicator.

Thermo-Flo^™ FT10 Liquid Thermal-Dispersion Flow Switch