Inductive sensors detect metallic objects and are used extensively in industry for position and speed monitoring applications. When these applications are located in Ex zones, the traditional approach has been to use Intrinsically Safe sensors to comply with zoning requirements. The challenge faced when using IS sensors is that you have to use barriers to isolate the sensors from the control system which adds extra cost in materials and engineering. To combat this problem, Rechner has developed a range of standard sensors that interface directly with control system equipment via PNP or NPN interfaces, whilst still maintaining IECEx certification. Sensors with IS outputs are also available to suit legacy systems.