flowswitch

A flowswitch is a device used to detect the presence or absence of fluid flow in a pipe or conduit. It typically operates by sensing the movement of the fluid, which in turn activates or deactivates an electrical switch. This switch can then be used to control other equipment, trigger alarms, or signal a change in system status.

There are several common types of flowswitches. Paddle or vane type flowswitches use a fin or paddle that is placed in the path of the fluid. As the fluid flows, it pushes the paddle, causing it to move and operate a microswitch. Thermal dispersion flowswitches, on the other hand, work by measuring temperature differences. A heated element in the flowswitch cools down as fluid passes over it, and this cooling effect triggers the switch. Other types include turbine, ultrasonic, and magnetic flowswitches, each employing different principles to detect flow.

Flowswitches are employed in a wide range of applications across various industries. They are commonly found in HVAC systems to monitor water flow to coils, in industrial processes to ensure proper lubrication or coolant flow, and in safety systems to detect leaks or prevent equipment damage due to lack of flow. Their primary function is to provide a reliable indication of whether fluid is moving as intended, thereby contributing to system efficiency, safety, and operational integrity.