The liquid nitrogen fill level meter for the AGATA triple cluster detector

A novel liquid nitrogen fill level meter has been put into operation for the all-position dewar of the triple cluster detector of the Advanced GAmma Tracking Array. The new device is based on a capacitance measurement between a metallic cylindrical tube inside the dewar and the inner wall of the cryostat. The fill level dependent capacitance is converted by a C/V-transducer into a DC voltage signal. Direct monitoring of the LN2 level inside the detector dewar has been performed with several AGATA detectors at various inclinations and rotation angles of the detector axis. The time-dependent LN2 consumption is an additional quantity used to survey the status of the cryostat. Supplementary results are the investigations of the LN2 consumption and the heat loss of the detector during different modes of operation.