26 Device Description WAGO I/O SYSTEM 750 XTR750-606/040-000 Power Supply 24 VDC XTR for Ex i XTR ModulesManualVersion 2.0.03.6.7 Climatic Environmental ConditionsTable 15: Technical Data ‒ Climatic Environmental ConditionsSurrounding air temperature, operation −40 °C … +70 °CSurrounding air temperature, storage −40 °C … +85 °CRelative humidity *) 95 %Elevation above sea levelwithout temperature deratingwith temperature deratingmax.0 m … 2000 m2000 m … 5000 m: 0.5 K per 100 m5000 mResistance to harmful substances Acc. to IEC 60068-2-42 andIEC 60068-2-43Maximum pollutant concentration atrelative humidity < 75 %SO2 25 ppmH2S 10 ppm*) Short-term condensation acc. class 3K7 / IEC EN 60721-3-3 permitted, applyingE-DIN 40046-721-3 (except wind-driven precipitation, water and ice formation)