73 MountingVEGABAR 82 • 4 … 20 mA46305-EN-1311253 Mounting3.1 General instructions for use of the instrumentProtect your instrument against moisture penetration through the fol-lowing measures:• Use the recommended cable (see chapter "Connecting to powersupply")• Tighten the cable gland• Turn the housing in such a way that the cable gland points down-ward• Loop the connection cable downward in front of the cable glandThis applies particularly to:• Outdoor mounting• Installations in areas where high humidity is expected (e.g. throughcleaning processes)• Installations on cooled or heated vessels3.2 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)→ Turn the housing so that the filter element points downward afterthe instrument is installed. This provides better protection againstbuildup.1 2 34 4 4Fig. 2: Position of the filter element - non-Ex, Ex-ia version1 Housing plastic, stainless steel precision casting2 Housing aluminium3 Housing stainless steel, electropolished4 Filter elementWith the following instruments a blind plug is installed instead of thefilter element:• Instruments in protection IP 66/IP 68 (1 bar) - ventilation via capil-laries in non-detachable cable• Instruments with absolute pressureProtection against mois-tureInstruments in non-Exand Ex-ia version