Shi Jianhua1, Li Xiaohui1, Li Hongliang 2, Liu Hongxia 3
（1. Zhengzhou Chuangwei Meian Technology Co., Ltd., Zhengzhou, Henan 450001;2. Henan Zhongyuan Expressway Co., Ltd., Zhengzhou, Henan 450001;3. Zhengzhou Winsen Electronics Technology Co., Ltd., Zhengzhou, Henan 450001）
Abstract: This article described the designing principle for a hydrogen sulfide gas detector based on the MSP430F135 monolithic integrated circuit, specifying its technical parameters for the use in the coal mines the environment, highlighting the points to be considered and intrinsically safe circuits to be used over the designing process.
Key words: hydrogen sulfide test, gas detector, intrinsically safe circuit design