Deploying a computer in a hazardous area - where do you start?
The need to install computer enclosures in hazardous, classified locations is very common. Process control, measuring and recording equipment exists in virtually every manufacturing process. The requirement for explosion proof enclosures is extremely critical.
Hazardous, classified locations are defined as areas in manufacturing facilities where the atmosphere may contain flammable concentrations of gas, vapors or ignitable concentrations of dust or fibers. It is customary for system designers and IT managers to specify the use of a NEMA 4 or NEMA 4X industrial computer enclosure with a pressurized purge system for these environments.
A purge system installed on a hazardous area computer enclosure will prevent ambient particulate or gas from entering the enclosure and ensure the safety of operators and equipment.
Hazardous areas are defined by certain “Classifications” and “Divisions”. Reference the chart below for an explanation of classes and divisions.
Hazardous Definitions
Classification |
Typical Materials |
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Class I |
Gases |
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Those areas in which flammable gases or vapors may be present in the air sufficient quantities to be explosive or ignitable. Group A Group B Group C Group D |
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Class II |
Dust |
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Those areas made hazardous by the presence of combustible dust. Group E Group F Group G |
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Class III |
Flyings |
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Those areas in which there are easily ignitable fibers or flyings present due to the type of material being handled, stored or processed. These may include rayon, cotton, sisal, hemp, jute, spanish moss and similar substances |
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Division 1 |
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A location in which ignitable concentrations of combustible material(s) are present in the air under normal operating conditions. |
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Division 2 |
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A location in which ignitable concentrations of the combustible material(s) are present in the air only under abnormal operating conditions, such as the cause during accidental rupture or breakage, or during unusual or faulty. |
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Purge systems offer a safe and economical means of installing computer equipment in a hazardous location. Before choosing a hazardous area computer enclosure, be sure to do your homework. Select a partner that has experience and a strong understanding of purge controls. Needless to say, the effect of choosing the wrong solution can be disastrous!
Considering using a hazardous purged computer enclosure for your next project? Download the ITSENCLOSURES product catalog to select the perfect enclosure for your environment.
