The explosion protection rating issue of electromagnetic flowmeters
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Exdiaq II CT6: What does the explosion protection rating of electromagnetic flowmeters mean? Can someone explain it to me?
Flameproof type, with an intrinsically safe internal circuit; suitable for use in environments with IIC T6 class gases
Exdiaq II CT6: Explosion protection declaration. The Ex mark indicates compliance with explosion protection standards. The explosion protection type is d, meaning intrinsically safe design. For associated devices such as safety barriers, the explosion protection type is intrinsically safe. I don’t know what iaq refers to in the parentheses… Gas category: II C, applicable to areas other than coal mines. Temperature group: T6, meaning the surface temperature of the instrument does not exceed 85 degrees℃
In Exdiaq II CT6, Ex denotes explosion protection, d denotes flame isolation, ia denotes intrinsically safe design, II refers to explosive gases and vapors, C indicates that the minimum ignition current ratio is less than or equal to 0.45, and T6 denotes that the ignition temperature range is greater than 85 and less than or equal to 100℃
The circuits of imported instruments are generally designed to be intrinsically safe, but explosion-proof enclosures have been added to meet the needs of domestic customers
There should be standards. GB3836-2000 Explosion-proof electrical equipment for explosive atmospheres, 15 volumes
The ‘q’ in IAQ – I think it refers to the \"sand-filled type q\" in the explosion-proof design of electrical equipment. I’m not sure why there are two ‘ia’s ?
It’s not a luxury; it’s essential! Electromagnetic flowmeters use a four-wire system; the signal is intrinsically safe, and the power supply must be explosion-proof.
This phrasing is a bit confusing; a field instrument is either intrinsically safe or flameproof – there is no such thing as being both intrinsically safe and flameproof.
When overall explosion-proof certification is obtained, the explosion-proof measures are usually specified on the explosion-proof certificate. Sometimes there might even be more.