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Magnetic rotational speed sensor with analog output
4 - 20 mA | ST420 Electro-Sensors

The ST420 is an analog-output shaft speed sensor. It detects magnetic pulses from a rotating shaft-mounted magnetic pulser target (disc or wrap) and outputs a smooth continuous 4-20mA analog signal in direct proportion to the pulse frequency (rotating shaft speed). The ST420 combines a magnetic pulse detector, signal processing and 2-wire loop-powered 4-20mA circuitry into a stainless-steel M18x1 sensor housing.

* 2-wire loop-powered 4-20ma analog shaft speed sensor
* Accurate quartz crystal based digital processing
* No user calibration � works right out of the box
* Standard and custom measurement ranges available
* Class II, Div 1 dust ignition-proof
* Intrinsically safe design
* Works with shaft-mounted pulser targets (disc/wrap)
* Stainless Steel M18x1 housing, NEMA 4X/IP67
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