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The Micro Proportional Driver is a compact electronic proportional control circuit built into an environment-resistant miniaturized enclosure. The circuit features proportional control of solenoids, operators, motors, etc. Functions include minimum and maximum current limiting, control signals from 0-10 V or 0-20mA (with a step function at 0.2 volts or 4mA included for minimum current), a .25-20 sec. linear ramp up/ramp down adjustment and output current proportional to the input command signal. This unit incorporates the Form "A" DIN 43650, ISO 4400 connector male and female interface. The unit is mounted by use of a single mounting screw, DIN connector and two gaskets. Built to meet NEMA 4 environment standards, the MPD is made from engineered polymers for resistance to harsh chemicals and ingress of water or foreign substances. Adjustments are made on the top surface of the unit. The unit can control any proportional solenoid valve operating within the specified values using variable pulse width modulation.