Fully automated, self testing level sensor

摘要

A system and a method of automatically and periodically checking the integrity of a mechanical level sensor system for a storage tank are provided. These mechanical sensors employ a magnetic mechanism to lift the displacers or floats to the full travel of the level sensor in order to simulate a level alarm condition. A timer and activation module periodically energizes the magnetic lift mechanism. An array of indicators and logic provides an indication to the operator of normal operation, a satisfactory test, an unsatisfactory test, and a genuine alarm condition.