The principle of operation Flow switch is the presence or absence of flow through the output switch control signal to the water sensor switch the main switch signal. Divided into specific types normally open and normally closed type in the main water control work flow monitoring role to play. Water flow switch and relay use with the usual components of the water control system easy to use no power is the flow switch on. Applications Mainly used for water heater boiler water dispensers coffee machines hot card machines steam equipment water system the campus card sales selling self-help water systems water treatment equipment cooling systems mechanical equipment instrumentation pharmaceutical equipment. Access must be connected to a voltage exceeding 24V relays