Fluke 574 FE 574 Users Manual - Page 6

574 Warning for the Model 574 NI Concerning Factory Mutual Approved Nonincendive Devices: Operation in Environments that Require Nonincendive Devices WARNING IN HAZARDOUS LOCATIONS DO NOT use serial port connections, change batteries or open serial port cover. To reduce risk of explosion in hazardous locations, use only Fluke temp probe part 2432508 and do not use other accessories, such as power supply and cables. A nonincendive rating (NI) indicates that this infrared thermometer has been tested to standards for preventing explosions in hazardous areas by limiting the ability of equipment to ignite a specified flammable gas or vapor-in-air mixture. Nonincendive equipment is incapable of releasing sufficient electrical or thermal energy to ignite flammable gases or vapors under NORMAL operation and environmental conditions. This noncontact thermometer has a Factory Mutual Nonincendive rating. The rating from this USA organization reads: "Nonincendive, Class I, Division 2, Groups A, B, C, D; Class I, Zone 2 IIC; T4 Ta = 50ºC when used with 1.5V alkaline batteries." A Class I, Division 2 location is a location: • where volatile flammable liquids or flammable gases or vapors exist, but are normally confined within closed containers; • where ignitable concentrations of gases, vapors or liquids are normally prevented by positive mechanical ventilation; or • adjacent to a Class I, Division 1 location, where ignitable concentrations might be occasionally communicated • groups A, B, C, D refers to: Acetylene, Hydrogen, Ethylene, and Propane. 6