PR980FS target type flow switch is used to measure the liquid flow switch, easy to install, installed directly on the existing pipeline. A flow switch can be used in many different sizes of pipes (diameter 25-150MM). Adjustable set point, maximum pressure 16bar. PR980FS Target Flow Switch features are as follows: Target Flow Switch is easy to install, installed directly on the existing pipeline micro switch for high contact capacity target type flow switch maximum pressure 16bar target type flow switch set point adjustable flow Switch Applications: field water treatment system, central air conditioning, water-cooled units, apply to water, ethylene glycol and any other brass, phosphor bronze corrosion-free gas or liquid. Flow switch works: when the flow rate exceeds a set value, the fluid pushing paddles, driving the top micro switch by mechanical means flow switch within its SPDT switch contacts (SPDT) make a circuit is turned on, while cutting off another circuit. The flow switch is usually used in the required interlock or "stop" of protected sites. Adjustable paddle number and length trimming blades to accommodate the needs of different diameters and flow rates. Source http://www.prill.com.cn/kzq/llkg.shtml