Hebei Changliang Industrial Automation Equipment Co., Ltd., founded in 2012, the main business scope includes industrial automatic control system device manufacturing and sales, gas equipment manufacturing and sales, sulfur-free odorant and tetrahydrothiophene sales, pump R & D design and sales, information system integration services, general equipment manufacturing, electrical engineering construction and installation services. There are 40 employees, including 8 electrical engineers, 2 project managers, 1 first-level builder and 1 second-level builder, who can be engaged in the design, development and debugging of various complex automatic control systems. The company 's newly developed high-pressure electromagnetic metering pump and gas dosing equipment have been put into production and widely used in the industry. By the end of 2023, sulfur-free odorants have been used by more than 200 gas companies.