Electro-Sensors, Inc. 4-20 mA Shaft Speed Sensor ST420

4-20 mA Shaft Speed Sensors Features • 2-wire, loop-powered 4-20 mA analog output • No user calibration: works right out of the box • Works with shaft-mounted pulser targets (disc/wrap) • Rugged stainless steel M18x1 housing • Reverse-wiring protected • UL listed, Intrinsically Safe (IS) • Class I, Div I (C, D) Class II, Div I (E, F, G) The patented ST420 detects passing magnets of a shaft-mounted pulser disc or wrap and outputs a smooth, continuous 4-20 mA analog signal in direct proportion to shaft rotation speed. Custom speed and pulser disc/wrap PPR ST420 models are available upon request.