MEASURING APPARATUS AND METHOD FOR MONITORING A MEASURING APPARATUS

摘要

The measuring apparatus comprises a measuring transducer (MW) that is accommodated at least partially in a, particularly grounded, housing (100) for detecting the at least one measured variable and a measuring apparatus electronics unit (ME) that is electrically connected at least at times to the measuring transducer. The measuring apparatus electronics unit (ME) comprises at least one measuring channel for detecting and processing at least one primary signal (s1) generated by the measuring transducer and a current measuring circuit (20B) for detecting electrical currents flowing inside the measuring apparatus. Furthermore it is provided that the current measuring circuit, at least at times during operation, detects particularly in a recurring manner an electrical leakage current (IL), which flows due to the potential difference (?U12) present at least at times between the housing and measuring apparatus electronics unit and an electrically conductive connection (RF) that is likewise present between the housing and measuring apparatus electronics unit and may be undesirable and/or formed by a coating that developed on the housing. Taking the detected leakage current into consideration, the measuring apparatus electronics unit further generates at least one, in particular digital, state value (Z), which presently represents an in particular erroneous operating state of the measuring apparatus.