Help, experts! The meaning of the instrument explosion-proof code is as follows!
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Seeking help from experts: what do the explosion-proof codes for instruments mean, as shown in the figure below. In particular, what do “1” and “2” at the beginning of the code mean? Thank you!
Experts, please come and rescue us!
http://www.rstahl.com/fileadmin/Dateien/tgus/Documents/ExProtection_Global-America-Basics.pdf
1 represents Category 1 equipment, which can be used in Zone 0 and Zone 20； 2 refers to Category 2 equipment, which can be used in Zones 1 and 21; there are also Category 3 equipment, which can be used in Zones 2 and 22. Look it up by yourself for the rest!
Could you provide a specific source? Aren’t equipment classified only into Category I for mines and Category II for factories? Moreover, if 1 represents Category 1 equipment that can be used in Zone 0, then isn’t Zone 0 supposed to use only \"ia\" type and special types of equipment? Types like 1EXDIIBT5 shouldn’t exist in such a case. Thank you
1: Flameproof IIB T5, 2: Increased safety IICT6; hydrogen sulfide is not considered for liquefied petroleum gas
Sorry, I was asking about the meaning of the codes “1” and “2” earlier! Thank you
That was the first time I saw Arabic numerals 1 and 2 added in front
I took a closer look at your question; the previous answer was a bit hasty. Are you sure this format is correct? Ex is the Chinese gas explosion-proof marking; the numbers in front of it are meaningless and represent an improper way of writing it ； If it is the European standard, it should be written as EEx; for the specific details, please refer to page 10 in the attachment on floor 4.