Hazardous zone locations, Class/Division vs Zone system

Hazardous zone

Hazardous zone locations are classified according to the nature of flammable materials present in the atmosphere. In some locations such compounds can be present for a short duration while in other places they are found continuously. The two main systems used to classify hazardous location are class/division system used in the USA & Canada and Zone system used by other countries.

Although, both of these systems are reliable and were developed to give protection, they use a different approach in classifying hazardous zone locations. This does not necessarily mean that one system is better than another; each one has its own metrics and depends on user location. Presently zone system is widely used throughout the world, depending upon the nature of environment the usage and preferences can vary.

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Basics of hazardous area classification and protection methods

hazardous area classification
Hazardous locations are places that contains or are expected to contain sufficient quantities of flammable liquids, gases, vapor or combustible dusts to produce an explosion or fire. Industries like oil&gas, plant floor, chemical, refineries, and many others require explosion protected equipment.

Presently there are two systems that classify hazardous areas, the class division system (used in the United States and Canada) and the zone system based on the international electrochemical commission (IEC) and European Committee for Electrochemical Standardization

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Class / Division Hazardous Locations Allen Bradley

Class/Division Hazardous Locations Allen Bradley

Arista-Website-Hazardous-Location-Allen-Bradley

About Arista

Founded in 1994 and headquartered in Fremont, CA, with operations in China, India and Taiwan. Arista Corporation is committed to the highest standards of product development, engineering, manufacturing and customer support. Our extensive product portfolio includes Industrial Panel PCs, Industrial Monitors, Box PCs & Fanless Embedded Computers, Rack Mount Computers, ACP ThinManager Ready Thin Clients, Embedded CPU Boards and Video Extender/Switches.

Market Focus


We provide off-the-shelf, full turnkey integration services, and custom ODM/OEM design and development services for the Industrial Automation, Food & Beverage, Pharmaceutical, Oil & Gas, Waste Water Management, and Control Room marketplaces. Our ODM/OEM capabilities help our customers meet exacting specifications and requirements at an affordable price and quick time to market in harsh operating environments.

Manufacturing & Support Capabilities


All of our products are assembled and tested in our ISO 9001: 2008 facility in Fremont, CA, undergoing stringent quality oversight enabling Arista Corporation to provide a two (2) year depot warranty for all computer products and three (3) year depot warranty for all display products. We work on the embedded long roadmap enabling 5+ years continuity of supply and support, complemented by a comprehensive stringent revision control process.

RoHS Compliance


The European Union adopted Directive 2002/95/EC in February 2003 that restricts and prohibits the use of heavy metals (lead, mercury, cadmium, and hexavalent chromium), polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE) in new electrical and electronic equipment shipped after July 1, 2006. All new products under development at Arista Corporation meet the directive’s requirements.

Conflict Minerals Sourcing Policy


Conflict minerals (columbite-tantalite, cassiterite, wolframite and gold, or their derivatives, including tantalum, tin and tungsten) originating from Democratic Republic of the Congo (DRC) are sometimes mined and sold by armed groups to finance conflict characterized by extreme levels of violence. Some of these minerals and the metals created from them can make their way into the supply chains of the products used around the world, including those in the electronics industry.

It is the policy of Arista to avoid Conflict Minerals that directly or indirectly finance or benefit armed groups in conflict affected regions. Arista is committed to sourcing components and materials from companies that share our values around human rights, ethics and environmental responsibility.

Arista expects its suppliers to commit to the EICC Code of Conduct which includes a provision related to the responsible sourcing of minerals. Pursuant to that Code of Conduct, suppliers must have a policy to reasonably assure that tantalum, tin, tungsten and gold in the products they manufacture are DRC conflict free. Arista will immediately discontinue engagement with suppliers who pose any risk supporting conflict minerals.

Our Core Values


In a continuous pursuit of excellence, our core values include Innovation, Reliability, Agility, Integrity and Trust. ‘Talk to us. We listen.’ We listen to our customers. We then apply creativity, technology, engineering and manufacturing expertise to provide the optimum solution. We listen so we can continuously improve our products, processes and services. We listen because our objective is to work in partnership with our customers to establish a long term successful relationship…