Hermetically-sealed bottom reference switch detects tank floor for calibration. Stainless steel helical drive cable contains and protects all sensor wires. Tank Top Mechanical Unit Arc plate eliminates bending stress on helical drive cable. Spring motor drives helical cable take-up reel. Viewing windows located on end plates to verify operation.
Magnetic switch confirms continuous take-up reel rotation and provides alarm capability.
The control unit for the M629O is mounted on the tank inside an explosion proof box. Communication to the control room for both the host computer and an optional PC based operator interface is via RS485. System configuration is accomplished by means of a hand-held PC, which can be used either on the tank or in the control room. Up to 8 tanks may be controlled from one Power Control Unit. When installed, the program running on the PC in the control room provides complete system control including tabular and graphic display of tank profile data for layering detection.