18D
Electro-mechanical pneumatic pressure/vacuum switch
info@nortrade.si | +386 4 531 75 50
info@nortrade.si | +386 4 531 75 50
Vacuum switches detect the presence (or loss) of vacuum at the work head — the safety interlock that prevents a pick-and-place from dropping a load mid-stroke. The Norgren 18D, 34D, 51D and 54D series cover the spectrum from rugged electromechanical (18D, with ATEX option) to digital electronic with display (54D). These products live under our [Pressure Switches & Sensors category](/products/pressure-switches) for cross-context reuse — same parts, indexed both ways.
Electro-mechanical pneumatic pressure/vacuum switch
Electro-mechanical hydraulic pressure switch
Electro-mechanical pneumatic pressure/vacuum switch (ATEX certified)
Electronic multi-fluid pressure/vacuum switch
Electronic pneumatic pressure/vacuum switch
Electronic pressure/vacuum switch with display
Physically often the same switch — the difference is the setpoint polarity. A vacuum switch is configured to trip below atmospheric (e.g. at -0.5 bar) instead of above. The Norgren 18D / 34D / 51D / 54D ranges cover both as standard.
When the vacuum work happens in a hazardous area (Zone 2 gas / Zone 22 dust — ATEX Cat. 3G/3D) — flammable powders, solvent vapours, dust collectors. The standard 18D is for general industry; the ATEX variant adds the safety certification.
18D is rugged, no electronics, snap-action — the right pick for harsh environments and simple PLC inputs. 51D / 54D are electronic — PNP/NPN output, parametrisable hysteresis, optional analogue, integrated display. Pick electronic when you need diagnostics or on-tool setpoint changes.
Yes — the 34D, 51D and 54D all have integrated displays. The 54D offers a 4-20 mA analogue-output variant, and 51D versions with analogue output are available on request. The 18D is on/off only.
