UL , TUV and CSA. RS Pro Pneumatic Pressure Switch 18D- ATEX. The 18D series pneumatic pressure switches from RS Pro are intrinsically safe to operate and contain a microswitch with gold plated contacts. These pressure switches are ATEX approved. Features and Benefits. Microswitch with gold plated contacts. High number of switching cycles. Vibration resistant to 15 g. Microswitch approved by UL and CSA. Intrinsically safe operation. Assortment of pressure ranges. Temperature range: 0°C to +80°C. FKM sealing. Product Application Information. For neutral, gaseous and liquid fluids.