Model 18D Electro-mechanical pressure switch's for connecting and disconnecting electronic circuits utilising pressure. Norgren's 18D pressure monitoring switches reliably monitor minimum pressure and are equipped with automatic switch off and pressure limit warning. Suitable for use in pneumatic, hydraulic and vacuum systems. Gold-plated microswitch contacts High number of switching cycles permissible Designed for pressure monitoring in hydraulic systems Designed to withstand vibrations up to 15G Suitable for intrinsically safe operation ATEX version (Stock No. 622-3647 ) Technical Specification Contact Rating (ac) Contact Rating (dc) Accuracy/Repeatability Maximum Frequency of Operation (cycles/min) Fixed Hysteresis Temperature Range (°C) Environmental Protection 5A @ 250 Vac inductive (3A0 resistive) 0.25A @ 250 V(dc) ±3% of Set Pressure 120 - -20 to +80 - Approvals UL; CSA Pressure Switches Pressure switches that allow microswitch operation once a pre-set pressure is reached. K and K3 Series incorporate a mechanical stop providing over-pressure protection for the spring and microswitch. Electrical connections for all models to DIN 43650. Warning Observe switching range. Do not subject switch to maximum allowable pressure during normal operation. Short pressure peaks must not exceed this value.