Explosion zone 4-20mA instrument junction box
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In Zone 1 or Zone 2 explosion areas, does the instrument junction box with 4-20mA signaling (including HART communication) – which uses only low-voltage 4-20mA and 24VDC signals – require an explosion-proof design?
It’s definitely necessary; otherwise, the acceptance won’t be approved.
Zone 1 is required, while Zone 2 does not need to be explosion-proof.
Analog signals use intrinsically safe types, while digital signals use flameproof types
In explosion-proof areas, all electrical equipment must carry an EX mark; low-voltage circuits below 60V can use intrinsically safe explosion-proof enclosures
In Zone 1, explosion-proof enclosures are also used for low-voltage equipment; in Zone 2, it is advisable to use them as well, though cost is the main consideration
Ahah, dear sea friends, using explosion-proof materials is not just for passing inspections; it is aimed at ensuring the safety of the equipment in use on site – that’s what really matters! It is necessary to carry out design and selection in strict accordance with explosion-proof design specifications; it is essential to choose different types of explosion-proof junction boxes depending on whether the transmitter is explosion-proof or not!