Medium level measuring device, has guard-electrode control unit, which charges guard-electrode with charge compensation signal, and monitoring unit formed such that it monitors compensation signal and/or power requirements of control unit

摘要

The device has a control/evaluation unit (6), which controls a sensor unit (5) with an electrical control signal. A guard-electrode control unit (11) charges a guard-electrode with a charge compensation signal. A monitoring unit (15) is formed such that it monitors the charge compensation signal and/or power requirements of the control unit. The unit (15) produces a signal, if the requirements lies over a threshold value.