Your Guide to Specific Machine and Production Environment Standards

Detailed advice on hygienic design in food machinery is contained in EN 1672-2 Food Processing Machinery – Basic Concepts – Part 2: Hygiene and Cleanability Requirements, according to PMMI’s 2007 Guide to the Key European Directives for Packaging Machinery – Fourth Edition.

Machine standards for hazardous environments

Equipment designed for hazardous environments, e.g. dusty or volatile gases, must meet ATEX or HAZLOC (hazardous location) requirements.

In the E.U., the Equipment for Use in Potentially Explosive Atmospheres, or ATEX Directive (from the French Atmospheres Explosif), details requirements for testing and certification that the machine is designed to prevent unexpected combustion, according to the PMMI 2007 guide and Excell Battery Co.’s “A Quick Introduction to HAZLOC and ATEX Requirements.”

In the U.S. and Canada, such devices must be HAZLOC-rated. HAZLOC organizes devices according to class.

HAZLOC standards are organized between three classes.PMMI Business Intelligence: 2023 The Impact of Global and Local Standards on OEMs & SuppliersClass I denotes when gases may be present. Class II is used when dust may be present, and Class III is used when fibers may be present. Classes are then divided by whether the hazard is always present or only exists under abnormal conditions.

However, a transition is occurring, and new devices should now conform to the IECEx standard, an international system prepared by the International Electrotechnical Commission for certification of equipment for use in explosive atmospheres. It’s harmonized with the ATEX Directive and uses symbols and alphanumeric codes to classify different types of hazardous (explosive) conditions and to define the likelihood of an explosion in those conditions.

Unlike the HAZLOC system, the IECEx and ATEX systems are zone-based and classify the degree to which hazardous gases or dust are present by numerical zones.

It should be noted that certification applies only to the specific device tested. If two or more certified devices are used together, the combined system must be tested and certified for the location where it will be used. This process typically involves a specialized lab and a third-party certification company.

SOURCE: PMMI Business Intelligence, "2023 The Impact of Global and Local Standards on OEMs & Suppliers"

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