Explosion-proof knowledge
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Is there a difference between Ex d IIC and E*a IIC?
Ex d IIC is dual-certified and suitable for intrinsically safe and flameproof applications, while E*a IIC is only intrinsically safe.
This post was last edited by daguhualiuying on 2016-12-1 at 14:26. I don’t understand why intrinsically safe instruments still need to be explosion-proof; intrinsically safe design already serves to limit the energy of ignition sources. Or could we just use explosion-proof instruments instead? Why use both intrinsically safe and explosion-proof designs?
The Ex d [ia] IIC explosion protection type is a composite type, featuring an intrinsically safe main unit along with devices connected to its intrinsic safety output. E*a IIC intrinsically safe and explosion-proof. ? ?
;P What a great speech upstairs – Benan should be fine
Flameproof instruments are much more expensive than intrinsically safe instruments. But some instruments can only be made in an explosion-proof design.
It’s precisely because I don’t need it that I hope someone who understands can explain it to me; I don’t think this guy gave any good suggestions at all :(
Intrinsic safety instruments need to be part of an intrinsic safety circuit in order to provide explosion protection, such as safety barriers and intrinsic safety cables. Explosion-proof instruments do not require these elements to meet explosion protection standards. It can be said that instruments with dual certification have a wider range of applications, which is an advantage
Ex d [ia] IIC devices are flameproof instruments, but some of them meet intrinsically safe requirements. Typical application: The power supply section of the instrument is separated from the main body, or an inner casing is used within the instrument enclosure. Power supply is intrinsically safe, while the main unit is intrinsically safe. Commonly found in mass flow meters or analytical instruments of certain models ； The instrument is intrinsically safe, while the wiring section is intrinsically safe as well. Some valve positioners put the wiring in a separate box; that’s what it means.