Tianjin Yihuan Automatic Instrument Technology Co., Ltd. is a Chinese national new technology enterprise which is given special assistance by Tianjin municipal government. Tianjin Yihuan Automatic Instrument Technology Co., Ltd is a council member of China Instrument Manufacturer's Association. Our company is an authorized enterprise with meter certification and one of the units involved in the drafting of Chinese national protocols and standards for the flow instrument industry. All of our products adopt advanced technology, standardized manufacturing system & quality control system. Naturally, our company has gained ISO9001:2000 certificate guarantee. Our company has a team of high-quality professional staff members and is equipped with liquid calibration device with precision up to 0.05% and 0.5% gas calibration device. These two advanced facilities assure reliable , our main products consist of vortex flow meter, electromagnetic flow meter, V-cone flow meter, ultrasonic flow meter, metal tube rotameter (variable area flow meter/suspended body flow meter), thermal mass flow meter, turbine flow meter, household meter, display device, isolator, safety barrier, pressure transmitter and differential pressure transmitter, resistance temperature meter and others. Furthermore, we are also an agency of Switzerland DIGMESA (DIGMESA) micro-flow meter. OEM experience. Patent sensor-head:Intelligent & non-contact measured medium vortex flow sensor for measurement is self-developed and produced by ourselves has obtained the national patent, with features of good earthquake resistance, high temperature resistance, high reliability, easy maintenance and others .