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本文依据SYJ——25——87中的规定,提出在原油罐区爆炸性环境中使用的超声液位监测系统应该符合的防爆类型、级别和组别.阐述了该系统中本安电路和关联电气设备的结构及结构安全设计,并运用最小点燃曲线作为重要依据论述了本安电路参数设计的原则。
Based on the provisions of SYJ - 25--87, this paper presents the type, level and group of explosion - proof that the ultrasonic liquid level monitoring system used in the explosive area of crude oil tank area should meet. Equipment structure and structural safety design, and use the minimum ignition curve as an important basis to discuss the principle of the intrinsically safe circuit parameter design.