Shaanxi Xiyi Measurement and Control Technology Co., Ltd (namely former Xian Pressure instrument factory, hereinafter referred to as XYMC), has been restructured as a limited liability company in May, 2010, is an enterprise gathering scientific research, development, manufacture and trade. Main businesses of XYMC are research &development, design, manufacture, sales, detection of automatic control equipment, whole set of relevant equipment, technical research, service and project contracting for enterprises such as power plants, chemical plants, CNPC and Sinopec. The key business is divided into three parts, including pressure, temperature and transmitter. The three parts respectively include YS series piston pressure gauge, XY series piston pressure gauge with new regulation, pressure calibration equipment with various measuring ranges, bourdon tube gauge needed to be installed in special occasion, digital pressure gauge, pressure sensor, pressure controller; thermocouple, thermal res