SCHURTER PSE EX piezo switch for explosive environments is certified with ATEX/IECEX approvals, making it suitable for use in a potentially explosive atmosphere containing air gases and dust. The Device Directive, 94/9/EC for Products and Protective Systems, was developed to protect equipment and personnel endangered by the ignition of gases, vapours, or dust that could lead to an explosion. This protection is achieved by the prevention of all possible sources of fire and ignition. Devices are available in 19 and 22mm diameters and are labeled with the approval information and an identification number. Products come in standard versions, deliverable with 16, 19 and 22mm mounting diameters with pin connections. The housing is available in red, green or natural aluminum. Additional colours, mounting diameters and connections are obtainable upon request. http://www.schurterinc.com