"Application Aid #19" by Minco Products, Inc., Minneapolis, MN, explains the North American and European classification systems for selecting temperature sensors for hazardous environments. Drawings show the components of an explosion-proof temperature sensor and an intrinsically safe installation. Tables summarize various classifications, definitions, and compare the protection methods of NEC and CENELEC. Charts show which Minco models are suitable for various conditions and are identified by the FM, CSA, and EX insignias.