Turck FCI-D15A4P-ARX-H1140 Flow Sensor – Inline Sensor with Integrated Processor, Flow sensor for liquid media, Calorimetric principle, Adjustment via potentiometer, LED band, DC 4-wire, 21.6…26.4 VDC, NO contact, relay output, Plug-in device, M12 x 1, Operating range 3…20 l/min