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Class I, Division 1

Daisy Data Displays, Inc. (D3) specializes in ruggedized computers and a variety of accessories to accompany them, such as industrial monitors, purge controls and more. Our customers often need equipment that will meet the requirements of different hazardous area standards. D3 offers products that adhere to different environmental classifications, one of which is Class I, Division 1 standards.


A hazardous area designated as Class I is one which is created by the presence of flammable gasses or vapors in the air, such as natural gas or gasoline vapor. When these materials exist in an environment, there is potential for explosion which could ignite if an electrical or other source of ignition is present, such as gasoline storage and dispensing areas. Classes are further defined by groups.


CLASS I (gases and vapors)
Group A (acetylene)
Group B (hydrogen)
Group C (ethylene)
Group D (propane)
CLASS II (dusts)
Group E (metal dust)
Group F (coal dust)
Group G (grain dust)
CLASS III (fibers)
No Subgroups


A Division 1 rating refers to a location in which ignitable concentrations of the combustible material(s) are present in the air or under normal operating conditions.


USA: NEC 500
Division 1
Explosive material Class Group
Gas/vapor or liquid I A, B, C, D
Dust II E, F, G
Fibers III
Division 2
Explosive material Class Group
Gas/vapor or liquid I A, B, C, D
Dust II F, G
Fibers III


Class I, Division 1 areas can be protected by using approved equipment offered by Daisy Data Displays, Inc. Equipment should be intrinsically safe, explosion proof, and X-purged and/or Y-purged. The intrinsic safety category refers not only to individual equipment, but to the entire circuit that is intrinsically safe.


The protection is in the circuit and not the housing. A circuit is described as intrinsically safe if no spark or thermal effect can cause an explosive atmosphere to ignite. In the case of intrinsically safe electrical apparatus, all circuits are intrinsically safe and depending on their overall protection method, this equipment can be used directly in the designated zones or divisions.


A purged system means supplying an enclosure with a protective gas at a sufficient flow and positive pressure to reduce the concentration of any flammable gas or vapor initially present to an acceptable level. Purging requires a monitoring unit that reliably switches off the electrical operating equipment inside the housing as soon as sufficient pressurization is no long present. The monitoring unit must be designed in a different protection method, so that it can also be operated without pressurization.


From PCs and monitors to keyboards and other accessories, D3 offers a wide array of products to ensure safety even in the most hazardous areas.





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