198611 – Thomson & Rutledge – Flashing Light Level Crossing Protection at Main Road Clematis using Harmon PMD 2 Motion Detector System

The Phase Motion Detector consists of seven major sections. They are: (1) Transmitter (2) Phase and Current Compensation (3) Receiver (4) Check Circuitry (5) Detection Circuits (6) MD Relay Drive Circuit (7) Self Check System.