Explosion protection encapsulated

Special protection comprises all protection techniques such as powder filling, static pressurization and encapsulation (by plastics materials). At that time, these techniques started their career in the field of explosion protection and advanced to autonomous types of protection described by IEC or European Standards individually. VDE 0170/0171/1969-01 does not contain any specific requirements for these techniques. It has been the decision of the certifying body that an s -apparatus will operate at the same level of safety compared with other well-defined types of protection, e.g. flameproof enclosure d ... 

The marking of such s -apparatus has been (Sch)s for mining equipment and (Ex)s G... for explosion protected apparatus (suitable for zone 1 applications). In many cases, protection techniques, which are covered by their own standards today, e.g. encapsulation - m - or static pressurization (as a part of pressurization - p - ), have entered the field of explosion protection as s -apparatus [17]. 

The control and subproducts for the instrumentation are governed by the general technical requirements for the other subproducts in the system. In addition, to fulfill all the general technical requirements, the encapsulation and protection of the environments in which the subproducts are used have to be considered, including danger of explosion, pollution, moisture, temperature, vibration, influence on heating and cooling, etc. See (Table 9.7). 

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