23.115/1 DFC 17B, 27B: Heavy-duty pressure switch How energy efficiency is improved Demand-led controlling and monitoring; no external energy source required. Areas of application For regulating and monitoring pressures in liquids, gases and vapours. Especially suitable for equipment that is subject to vibrations. Features  Pressure range: -1 to +50 bar  Contact rating: 1 mA, 6 V to 10 A, 400 V  Up to 110 °C media temperature  Gold-plated silver contacts, vibration-proof snap-action switch with single-pole change-over switch  Upper and lower switching points can be set independently  Sealable  As per PED (Pressure Equipment Directive) 97/23/EC, Cat. IV Technical description  Light-alloy housing with transparent cover  Splash-proof  Ambient temperature: -40 to +70 °C  IP 44  Brass sensor or stainless-steel for aggressive media, G ½", male thread, screw terminals for electrical conductor max. 2.5 mm², cable inlet PG 13.5 Contact rating as silver contacts max. Permissible ambient temp. Protection class Test marking 4) DWFS (SDBF) DWFS (SDB) DB (SDBF) PED for higher loading 10(2) A, 400 V~ 5) 6) (25 W), 250 V= min. 100 mA, 24 V as gold contacts 2) for lower loading max. 200 mA, 50 V min. 1 mA, 6 V Permissible vacuum loading –1,0 bar Type B30; B54 –0,7 bar Wiring diagram Dimension drawing Fitting instructions If under inductive load, take RC circuit into account If the contacts are ever loaded higher than 200 mA, 50 V, the gold plating will be damaged. The contacts are then classed only as silver contacts, since they lose the properties of gold contacts IP 54 with accessory 0259299000 Certificates can be downloaded from www.tuv.com 230/400 V networks From 70 °C media temperature, the current must be reduced to

Plug spanner for the setting screws. Cap nut with soldering nipple. Adaptor G½ to 7/16" 20-UNF-2A for connecting copper tubing of Ø 6 mm, brass. Screw connection for connecting copper tubes of Ø 6 mm, brass. Throttling screw for damping pressure surges; brass. Throttling screw for damping pressure surges; stainless steel. 1 m of capillary tubing for damping pressure surges; copper. 1 m of capillary tubing for damping pressure surges; steel. Damping screw for arresting pressure surges in low-viscosity media. Stainless steel. Bracket for off-wall mounting (already supplied with DFC 17 B 54…59)....

Additional technical data Complies with:Low-Voltage Directive 2006/95/EC EMC directive 2004/108/EC PED 97/23/EC, Cat. IV (Pressure Equipment Directive) VdTÜV 1) 2) 3) EN 60730-1 EN 60730-2-6 EN 61000-6-1 EN 61000-6-2 EN 61000-6-3 EN 61000-6-4 Pressure information sheet 100 EN 12952-11 EN 12953-9 Electrical serviceable life for safety applications: cos 1)= 0.6…1: DFC 17B, DFC 27B 5,000 switchings 2) 250,000 switchings 3) Mechanical serviceable life cos = 0.3 is not permitted Based on VD-TÜV paper 100, section 6.2.3 Based on EN 12953.- / EN 12952-11, section 4.4.2.6 Technical notes RC circuit...

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