H2S detector adopts large-scale integrated circuit technology, which conforms to international intelligent technical standards. This detector uses imported gas sensor to detect gas through natural diffusion, with excellent sensitivity and excellent repeatability, with data storage function, 5 minutes /15 minutes average calculation function, suitable for petroleum, chemical industry, gas transmission and distribution, storage, municipal gas, fire protection, environmental protection, metallurgy, biochemical medicine, energy and electric power and other industries.