How Does a Coolant Flow Switch Work?

A coolant flow switch is used to indicate loss of liquid coolant flow within a closed loop. A normally open flow switch will indicate the proper flow by closing when the coolant flow rate is above the switches setpoint. If the flow rate drops below the setpoint then the switch will open and turn off the system to prevent damage to equipment and to keep personnel safe.


Typical Coolant Flow Switch Applications:

  • Battery Storage Systems
  • Industrial Lasers
  • Laboratory Equipment
  • Medial Lasers
  • Proton Radiation Therapy Equipment
  • Semiconductor Manufacturing
  • Telecommunication Systems

Coolant Flow Switch FAQs:

Can a flow switch handle more flow than the flow set point?

A flow switch can typically handle a greater flow rate than its flow setting. Many flow switches are set 4 times less than the actual operating flow rate. As flow rate increases, pressure drop also increases, eventually causing a restriction of flow.

Can a flow switch be mounted at an angle?

Yes, piston and shuttle type switches utilizes a small, strong spring, that is not bothered by the mounting attitude of the flow switch and will perform at any orientation. The exception is our FS-400P, which is spring less.

Can a flow switch be cleaned?

Yes. The design facilitates cleaning by flushing out the flow switch with clean water. Some flow switches have removable parts for a more thorough cleaning.

Are flow switches set on the rise or the fall?

Typically, catalog units are set on the rise. Rising set points are most commonly used in coolant loops to insure proper flow. Switches can be calibrated on the fall when required.