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3 75 PRESSURE SWITCHES & SENSORS For further information www.imi-precision.com 20D Hydraulic ATEX - fixed switching pressure difference 20D Hydraulic ATEX - adjustable switching pressure difference *1) Atmospheric air pressure *2) Short-term pressure peaks are not allowed to exceed this limit value during operation. Operative utilization of the limit value is not permitted. The limit value corresponds to the maximum testing pressure. Accessories For Ex zones 1 and 2 (gases) category II2G type of protection Ex db eb IIC T6 For Ex zones 21 and 22 (dusts) category II2D type of protection Ex tb IIIC T80°C IP65 Medium: For neutral, self lubricating fluids, hydraulic oil, lube oil, light fuel oil Operation: Piston Degree of protection: IP65 (DIN 40050) Fluid/Ambient temperature: -10 ... +75°C (+14 ... 167°F) Air supply must be dry enough to avoid ice formation at temperatures below +2°C (+35°F) Materials: Housing: Aluminum diecast, anodized Sensor: Stainless steel (1.4404) Sealing: Steel piston (NBR or FPM) Technical features Microswitch with gold plated contacts Symbol Model Switching pressure range *1) (bar) Max. Over pressure *2) (bar) Switching pressure difference (typical) Lower range Upper range (bar) (bar) Fluid contact parts Sensor Port size 1846505 5 ... 160 300 5.00 9.00 Brass, steel, NBR Piston G1/4 1846705 10 ... 400 550 7.00 18.00 Brass, steel, FPM Piston G1/4 Symbol Model Switching pressure range *1) (bar) Max. Over pressure *2) (bar) Switching pressure difference (typical) Lower Upper range range minimal maximal (bar) (bar) (bar) Fluid contact parts Sensor Port size 1856505 5 ... 160 300 8.00 22.00 120.00 Brass, steel, FPM Piston G1/4 1856705 10 ... 400 550 15.00 40.00 300.00 Brass, steel, FPM Piston G1/4 Brackets Surge damper Pressure port reducing nipple 0574772 (Steel) 0553258 (G1/4, Stainless steel 14505, AISI 303/304 S) 0553831 (G1/2 & 1/2 NPT, Stainless steel 14505, AISI 303/304 S) 0553908 (Stainless steel) 0574773 (G1/4, Brass/Steel) 0550083 (G1/4A ... G1/2A, Stainless steel 14505, AISI 303/304 S) 0574765 (G1/4 ... 1/4 NPT, Brass) 20D Hydraulic ATEX Electro-mechanical pressure switch 5 ... 400 bar, G1/4