63 MountingVEGABAR 82 • 4 … 20 mA/HART46308-EN-1602123 Mounting3.1 General instructions for use of the instrumentProtect your instrument against moisture ingress through the followingmeasures:• Use the recommended cable (see chapter "Connecting to powersupply")• Tighten the cable gland• When mounting horizontally, turn the housing so that the cablegland points downward• Loop the connection cable downward in front of the cable glandThis applies mainly to outdoor installations, in areas where humidity isexpected (e.g. through cleaning processes) and on cooled or heatedvessels.3.2 Ventilation and pressure compensationThe filter element is mounted into the electronics housing. It has thefollowing functions:• Ventilation of the electronics housing• Atmospheric pressure compensation (with relative pressure meas-uring ranges)→ In case of horizontal mounting, turn the housing so that the filterelement points downward after the instrument is installed. Thisprovides better protection against buildup.1 2 3666 6654Fig. 2: Position of the filter element - non-Ex, Ex-ia and Ex-d-ia version1 Single chamber housing plastic, stainless steel (precision casting)2 Single chamber housing Aluminium3 Single chamber housing, stainless steel electropolished4 Double chamber housing plastic5 Double chamber housing Aluminium6 Filter elementProtection against mois-tureInstruments in non-Ex,Ex-ia and Ex-d-ia version