Pressure monitoring system for the CMS muon chambers

The CMS detector system of the LHC will use gas filled Drift Tube Chambers to detect muons. The gas pressure has to be kept at a constant level in the chambers and this level has to be monitored. Different versions of electronic boards (PADC) have been developed to regularly read out the pressure sensors and to send the pressure data to the Detector Control System (DCS) of CMS. This paper presents the functional description of the different PADC boards, the setup used for testing their radiation hardness and the results of the irradiation tests.