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Beijing Great Wall Metrology and Testing Technology Research Institute of China Aviation Industry Corporation ( 304 )

Project Name: Standard Device for Gas Flow of Positive Pressure Sonic Nozzle Method

The main technical parameters: Device expansion uncertainty: 0.3% (Sonic nozzle uncertainty 0.2%) (K = 2)

Test pipeline range: DN15 ~ DN200

Flow range: 1-2000Nm3 / h

Project description: This project is a set of positive pressure sonic nozzle method gas flow standard device constructed by Yihang Group (No. 304) according to needs. Complete knot
The structure adopts a rotary structure design, which is simple and convenient. The air source is an air compressor, and the standard device is a sonic nozzle. Compressed air passes through
The rear straight pipe section, the meter clamp device, the stagnation container, the sonic nozzle, and the manifold enter the atmosphere. All adopt microcomputer automatic verification control system, mainly used
For the verification and research of various gas flow meters.