Based on an evolving knowledge in hygienic design, EHEDG published additional guideline documents in recent years and identified new assessment criteria for testing and certification. For the sake of food safety, equipment fulfilling the most recent design criteria is considered as the only one suitable for installation into food processing plants. In 2014, EHEDG therefore decided to review the whole certification process and introduced a revised certification scheme as well as new certification requirements. A new certification class was introduced for equipment used in open processes in close proximity to the product contact area, or for equipment which could have a potential influence on the product contact area, and where it could become soiled and must be cleaned in place. These types of equipment (e.g. conveyor drives, vision sensors, etc.) were newly categorized as type EL Class I AUX for auxiliary equipment. The existing type ED was divided into two categories according to the EHEDG definitions, type ED Class I (dry cleaning without dismantling) and type ED Class II (dry cleaning with dismantling).
Starting December 2014, a lifetime of 5 years was implemented for newly issued EHEDG certificates. Since then, all new certificates are due for review on a 5-years basis in order to determine if the requirements to testing and certification have changed for the respective equipment type. If so, the certificate is out of date and the equipment has to undergo the whole certification procedure again according to the latest criteria. As before, certificates are considered as no more valid in case of a design change. In addition to an annual prolongation as a proof that the design has remained unchanged, each certified piece of equipment needs renewal of its certification after 5 years. The 5-year renewal reaffirms to EHEDG and to the equipment users that the equipment meets the latest hygienic design criteria and certification procedures. After 5 years, the certified logo and the certificate itself will receive a new date of certification. Consequently, only new certificates (not older than 5 years) are up to date, while old certificates are based on the requirements valid at that time.