working principle:

Online installation, mechanical flow switch for liquid or gaseous media. Rugged plastic, aluminum or stainless steel housing is available.
Features:
Minimal pressure loss, good repeatability, anti-fouling ability. The mechanical part is completely isolated from the electronic part, suitable for small flow economy. The piston stroke of 3 times the original FE20 makes the setting accuracy more precise. With the switch setting scale, the user does not have to set it on site. The LED shows the switch status and the dual switch output is available for selection.
Technical Parameters:
Setting range: See parameter table for details
Accuracy: ±5% total range
Hysteresis: depending on the switch point, minimum 0.6L/Min
Switch setting scale: It is calibrated in the medium of water, temperature 20 ° C, horizontal installation state. Installation position, medium and temperature changes will have a slight impact on the switch value.
LED display: DC power LED display switch status, AC no LED display.
Wiring method: M12 connector
Output: Reed Switch, Capacity 24VDC / 250VAC, 100mA
Withstand voltage: 10bar (plastic) 50bar (aluminum type), 100bar (stainless steel)
Average pressure loss: 0.3 bar (at 25 L/min)
Medium temperature: up to 90 ° C
Protection level: IP65
FE20...GS Material: Housing: POM plastic, Piston: POM plastic, Spring: Stainless steel, Seal: NBR
FE20...GL Material: Housing: Anodized aluminum, piston: POM plastic, Spring: Stainless steel, Seal: NBR
FE20...GX Material: Housing: Stainless steel, Piston: POM plastic, Spring: Stainless steel, Seal: NBR