Method for monitoring a level measuring device and level measuring device operating on the radar principle

摘要

Method (1) for monitoring a level measuring device (2) operating according to the radar principle, the level measuring device (2) having a mounting housing (3) with a leakage chamber (4) arranged on the process side, a signal conductor (5) for conducting transmitted and / or received signals , a transmitting and receiving unit (6a) designed for transmitting and receiving the transmitted and received signals and a control and evaluation unit (6b) designed for controlling the transmitting and receiving unit and evaluating the received signals, the signal conductor (5) from the interior of the leakage chamber (4) of the holder housing (3) through a process-side first opening (7) of the leakage chamber (4) and / or the holder housing (3) into the process-side outer space of the holder housing (3), the first opening on the process side Opening (7) of the leakage chamber (4) and / or of the mounting housing (3) and the second opening (8) of the leakage chamber (4) and / or of the H, facing the transmitting and receiving unit (6a) aging housing (3) are each sealed with a first seal (9) or with a second seal (10), comprising the following process steps: - sending (11) a pulse-shaped transmission signal along the signal conductor (5), - receiving (12) a reflected received signal, - forwarding (13) of the received signal to the control and evaluation unit (6b), characterized in that the frequency spectrum of the received signal is determined and that the monitoring of the level measuring device (2) takes place in the frequency domain, whereby from the frequency spectrum of the received signal at least a monitoring parameter for monitoring the level measuring device (2) is extracted (15) and that a leak is detected as a change in the monitoring parameter.