Issues regarding dust explosion prevention for E+H instruments

Could someone please help explain this? It can’t be that E+H won’t work; it’s a bit confusing

Here’s the answer using dp to help you: lol This is because in dust explosion protection certification, temperatures are not classified using the T1–T6 system used in gas explosion protection; instead, the maximum allowable surface temperature is specified directly (such as T85°C, T100°C, etc.), rather than a temperature category. When you see other brands (such as Chuanyi) indicate T85℃, it clearly specifies the maximum allowable surface temperature of the device. As for the E+H notation method: specific values are not given directly in Exta/tb III C Da/Db. Generally, this is because E+H in websites or selection software only provides a framework of certification codes and grades; to determine the actual maximum temperature on the device’s surface, it is necessary to refer to the actual product documentation (such as the specific product model data sheet or explosion-proof certificate). In other words, this is labeled as an “authentication category” rather than a final temperature indicator; the temperature data must be specified in detailed documents such as the explosion-proof certification or the product manual. So the reason why temperature designations such as Txx℃ are not listed for Exta/tbⅢC Da/Db in the selection tool on the official website is that these designations only indicate the certification level and protection type, without specifying exact temperature limits. In actual use, it is necessary to determine the applicable range of the product based on the maximum actual surface temperature value (T value) specified in the instrument’s explosion-proof certification or technical documentation; this must be confirmed during final installation. In fact, in accordance with the requirements of standard GB12476, instruments used in dust-filled environments must indeed indicate clearly the maximum allowable surface temperature. However, some selection tools and websites only indicate the form of certification; for specific usage details, it is necessary to consult the detailed technical documentation or relevant certificates. In conclusion: – The dust explosion protection rating must specify the allowable surface temperature of the equipment (e.g., T85°C); however, the temperature categories used for gas explosion protection such as T1–T6 are not applied ； - The E+H selection tool or website only provides the identification of the certification category; it does not show the specific temperature. To obtain the exact temperature value, it is necessary to consult the actual explosion-proof certificate or official technical documents ； - When selecting a configuration or placing an order, detailed explosion-proof certificates or technical data should be requested from the manufacturer in order to finally determine the maximum allowable surface temperature. .

No need, no need, I understand now

Do you understand? Can you tell us why there is none for E+H?

I don’t usually browse forums that much. Let me tell you, I asked the distributor of e+H for the complete set of relevant certifications, and on the first page of their product certification documents, there is only the grade indicated. But if you keep scrolling back, there are temperature categories. So, just by looking at the official website, you won’t find this information.