Defining Class I Specifications and Subgroups

Class I locations are areas where flammable gases may be present in sufficient quantities to produce explosive or flammable mixtures. Class II locations can be described as hazardous because of the presence of combustible dust. Class III locations contain easily ignitable fibers and flyings. Division 1 designates an environment where flammable gases, vapors, liquids, combustible dusts or ignitable fibers and flyings are likely to exist under normal operating conditions. On the other hand, Division 2 is an environment where flammable gases, vapors, liquids, combustible dusts or ignitable fibers and flyings are not likely to exist under normal operating conditions. Hazardous atmospheres are further defined by ''groups.'' These include:

• Group A: Atmospheres containing acetylene.
  
  
• Group B: Atmospheres containing hydrogen, gases or vapors of equivalent hazard such as manufactured gas.
  
  
• Group C: Atmospheres containing ethyl-ether vapors, ethylene, or cyclo-propane.
  
  
• Group D: Atmospheres containing gasoline, hexane, naptha, benzene, butane, propane, alcohol, acetone, benzol, lacquer solvent vapors, or natural gas.
  
  
• Group E: Atmospheres containing metal dust - including aluminum, magnesium, and their commercial alloys, and other metals of similarly hazardous characteristics.
  
  
• Group F: Atmospheres containing carbon black, coal or coke dust.
  
  
• Group G: Atmospheres containing flour, starch, or grain dusts.
  
  

Class I, Division 2 Survivor Series -- hazardous area flat panel computers and monitor -- feature full agency approvals and are available with 10.4" VGA, 12.1" SVGA and 15" XGA displays. Sunlight-readable displays available in 15" systems.

The Class I, Division 2, 10.4" and 12.1" hazardous area flat panel computers combine an AMTFT display, 333 MHz AMD K6-2 computing engine and PC/104 expansion. Operator interface is accomplished through the resistive touchscreen, external mouse or an external keyboard (using external PS/2 connectors). To offer flexibility to the end-user, Survivor-C10 and Survivor-C12 flat panel computers offer 10/100BaseT or coax Ethernet, including PC/104 expansion (additional PC/104 modules require approval). Their sturdy enclosure design features quick-release latches which let the user easily detach the computer and display portion from the touchscreen and front bezel. This simple access permits quick on-site maintenance, system upgrades, software changes and field replaceability of backlights.