3819.1.3 MaintenanceNOTE: Before performing any maintenance that involves opening the flameproofenclosure, make sure that there is no tension in any of its internal components.Modification or reparation of the flameproof housing is not permitted.The flameproof seals of the housing should kept greased to avoid corrosion, water ingressand seizing.19.1.4 Technical characteristics of the ATEX versionTemperatureAmbient temperature: -20ºC ... +60 ºCElectrical connectionInside the flameproof housing.Recommended cableThe standard thread supplied for the cable gland is ¾ "NPT.ATEX cable glands can be placed for normal cable or armoured cable. ATEX cable glandscan be supplied on request.The outer diameters of the cables that adapt to the ¾” NPT thread cable glands range from6 to 21 mm.The ingress protection of the flameproof housing is IP67The rest of characteristics are the same as in the section 15.19.1.5 MarkingAn example of marking is shown as follows.The marking of the equipment shows the following characteristics:- Manufacturer- Model- Serial number- CE marking- ATEX marking- Certification number- Address of the manufacturerThe marking label is located at one side of the housing, always visible