Can ExdⅡBT4 be used with potting?
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I’ve always had some confusion regarding the concept of explosion protection. In general technical specifications and customer requirements, what is indicated is usually ExdⅡBT4 (this is how it’s written in most cases; there isn’t a more detailed standard specification). I would like to ask everyone: in such situations, can I use a potting-type electromagnetic flowmeter, or must I use an explosion-proof one? Is there also such a term as EX mb? It’s just an outsider’s opinion; please give me an explanation.
This sea friend, let me explain! The so-called EX d and EX mb are two structural types of explosion-proof electrical equipment, which can be used in certain explosion-proof environments (determined by the explosion-proof zone in which the equipment is located; for example, in explosive gas environments, Zones 0, 1, and 2) ； Or in explosive dust environments, Zones 20, 21, and 22). The electromagnetic flowmeter proposed by the original poster was designed in the EXd format; if explosion-proof zone 2 is chosen for the design, then an electromagnetic flowmeter in the EX mb version should work fine. The key issue is whether such a type of flowmeter is available on the market. Additionally, it also depends on whether the protection level (EPL) Gb of the equipment used by the system owner allows for both structural configurations to be employed (for example, either flameproofing or encapsulation).
The standard \"GB 50058-2014 Code for Design of Electrical Installations in Explosive Atmospheres\" provides detailed explanations; you should go and take a look to understand it