Summary

The piston flow switch is a sensor device used for water circulation control, inlet/outlet water control, water heating control, pump switch control, solenoid valve on/off control, or power cut/on control of water flow in electric water heaters, solar water heaters, air conditioners, and other water systems. It converts the water flow into a switch-type electrical signal once a certain flow rate is reached.

Inside the flow channel of the piston flow switch housing, there is a piston containing a permanent magnet. When the water flow in the pipeline exceeds the set flow rate, the magnetic core is displaced by the water flow, causing the magnetic field to actuate the sensor to output a "1" switch signal. This signal is sent to the control system and amplified to achieve flow-based control. When the water flow drops below the set flow rate, the magnetic core returns under the force of a reset spring, causing the sensor to output a "0" switch signal to stop the system operation.

Parameters

Accuracy: ±5% of full scale

Hysteresis: Depends on switch point, minimum 0.5 L/min

Switch Setting Scale: Calibrated for water at 20℃ and horizontal installation; installation position, medium, and temperature variations may slightly affect the switch value

LED Indicator: DC powered models have LED display for switch status; AC powered models have no LED; dual switch output available

Wiring Options: Direct leads, Hirschmann connector, aviation plug

Output: Reed switch, capacity 24VDC / 250VAC, 100mA

Pressure Resistance: 10 bar (plastic), 50 bar (aluminum), 100 bar (stainless steel)

Average Pressure Loss: 0.3 bar (at 25 L/min)

Fluid Temperature: Max 90℃

Protection Rating: IP65