H2S continuous monitoring is simple, convenient and reliable. If corrosive hydrogen sulphide is generated in the sewer system, it makes rust in the sewer and generates odours from underground. In the worst case, the H2S gas greatly damages buildings and facilities. The GHS-8AT-EX data logger makes it possible for continuous monitoring in the sewer system. Continuous monitoring is provided to watch the sewer system, corrosion of sewage pipelines and generation source of offensive odours.