I have a question regarding the explosion protection rating of instruments; it might be a bit silly
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This post was last edited by A Entropy on 2022-1-5 at 09:11. This question might be a bit silly; it stems from my lack of prior knowledge on this topic and from my superficial understanding of it. I did a quick search on Baidu, but ended up feeling confused. I’d like to get everyone’s input again to confirm and verify my own understanding. The question concerns the explosion protection rating of the instruments; for example, in the specifications for pressure transmitters, the explosion protection requirement is indicated as: E*a IIC T4. The nameplate on the gauge purchased reads: E*a IIC T6. May I ask whether the gauge purchased meets the requirements, and whether it has better explosion protection properties than those specified in the technical data sheet? My current understanding is that E*a IIC T6 is better than E*a IIC T4. I’m coming to confirm with everyone because I remember that previously I thought E*a IIC T4 was better than E*a IIC T6
The gauge is of type T6, which indicates that the surface temperature of this gauge is lower; it generates less heat, making it superior. The temperature range specifies the upper limit for the surface temperature of an object, and it is backward compatible
It covers the original requirements, so it can be used directly without any issues.
Mm-hmm, that’s how I understand it now too; at the time I just didn’t know how to figure it out
In CT4 applications, the temperature required to meet explosion-proof standards cannot exceed 135 degrees; in CT6 applications, the maximum temperature allowed for electrical components to generate heat is 85 degrees. Therefore, it is no problem to use CT6 in environments where CT4 is required
The current understanding is correct. Temperature category: It refers to the requirements regarding the temperature rise (the surface temperature of the device) of the equipment (in this case, the pressure transmitter), with T6 representing the highest requirement. The specifications are chosen based on explosion hazards (perhaps only T2 is required for gases that are explosive), so it is no problem to use a higher standard as a baseline.
The CT6 is superior to the CT4; the explosion-proof rating of many instruments is at the CT6 level
Ex ia IIC T6 is likely the highest explosion protection rating among explosion-proof devices, and can be used in all explosive environments and hazardous areas