LXH-type Sonic Nozzle Gas Flow Standard Device 

LXH-type sonic nozzle gas flow standard device  (hereinafter referred to as device), selecting the national standard (ISO9300 "critical flow Venturi nozzle gas flow metering") Venturi nozzle as a standard flow meter, using master meter method for flow detection or testing . The device can be used in calibration or recalibration the turbine, swirl, precession vortex, rotary, industrial diaphram meter and other gas flow meters.

The device highlights the characteristics of high uncertainty, wide rangeability, high level of automatic integration, novel structure and so on. It can be applied to the testing and calibration of gas flowmeters for the petroleum, chemical and municipal natural gas industries. It is worth to mention that the device is specially suitable for National or provincial level Metrology Institution ,gas company and large-size industrial companies that daily job involves many different types of flow meters and with large calibration capability requirement. 

Functionalities 

●The device can be used for detection and calibration of various gas flowmeter

●The device can test the performance of gas flowmeter to provide reference data for research and development.

Key technologies

Pulse interpolation technology, nozzle leakage technology, automatic pneumatic clamp, sonic nozzle flow, temperature and humidity data compensation and error data calculation

Product parameters

Customized products, reference flow range of the device is 1~20000m3/h, DN20～DN600

Patent

（ZL201220127038.1）: a pulse collector with dual-timing counter 

（ZL201720396219.7）: a flow conditioning upstream straight pipe structure for gas flow standard device

（ZL201720396216.3）:a single way nozzle sealing structure for sonic nozzle gas flow standard device