Is it necessary to specify the protection rating for explosion-proof instruments?
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It’s a well-discussed topic, but I still have some questions: is it necessary to specify the protection rating for explosion-proof instruments? For example, if intrinsically safe instruments are used on-site, is it still necessary to specify requirements for the protection rating of those instruments? Can it be understood that the protection rating of explosion-proof instruments all exceeds IP67, so there is no need to specify a protection rating separately when making purchases?
Explosion protection is classified according to the hazard zone rating, and it is not necessarily related to the protection level; explosion-proof instruments (with simple flameproofing or intrinsically safe design) can all have IP65 or IP66 ratings. Therefore, explosion protection requirements and protection levels are two different concepts. Explosion protection relates to the hazardous environment in which the instrument is located, such as temperature ratings, hazard zones, and explosion protection types, etc. While the protection level refers to the operating conditions at the site, such as dusty environments or exposure to wind and rain outdoors. These are two distinct aspects that both need to be specified.
Received, thank you very much. However, from the selection manuals of E+H, Rosemount, and Foxboro, for instruments in the same series, there is only an explosion-proof option available; there is no choice regarding protection ratings. I find it a bit strange.
There should be one; it is indicated that this instrument can achieve the highest level of protection……
Okay, thank you. I’ll contact the manufacturer to provide it.
The explosion-proof rating is subject to mandatory certification, while there are no requirements regarding the protection level; it is generally determined by the manufacturer’s own standards. Some manufacturers provide both a certificate for the instrument’s protection level and a certificate for its explosion-proof rating, while others only offer an explosion-proof certificate. The selection manual definitely has options for protection ratings.