Solution to the Difficulty in Selecting Temperature Groups for Explosion Proof Instruments
Chemical plants are often exposed to various explosive gases.When designing explosion-proof instrumentation,it is crucial that the temperature class of the instruments meets the requirements of the explosive atmosphere zone.In some projects,the excessively high temperature of the process medium can lead to a situation where the temperature class certified in the explosion-proof certificate is lower than the required class for the explosive atmosphere zone,making it impossible to select a suitable tuning fork level switch product.To address this issue,this paper delves into the fundamental principles of temperature class explosion protection.Based on the specific division map of explosive atmosphere zones and the characteristics of the process medium in the project,three solutions are proposed to tackle different scenarios:reasonably adjusting the instrument location,finely dividing the explosive atmosphere zones,and implementing explosion-proof insulation for the instruments.Ultimately,the selected tuning fork level switch meets the temperature class requirements of the explosive atmosphere zone,thereby solving the challenge of selecting the appropriate temperature class for explosion-proof instrumentation under special operating conditions.
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