




The critical flow nozzle calibration device is designed and manufactured according to the JJG 620-2008 "Critical Flow Venturi Nozzle Verification Regulation" and the JJF 1240-2010 "Calibration Norms for Critical Flow Venturi Nozzle Gas Flow Standard Devices," mainly serving metrology institutes and large and medium-sized flow meter manufacturers.





|
Calibration Method |
Sonic Nozzle Method / Master Meter Method |
Working Medium |
Air |
|
Flow Range |
1~10000 m³/h |
Calibration Diameter |
DN15~DN300 |
|
System Stability |
≤0.10% |
Expanded Uncertainty |
0.3% (k=2) |
|
Control Mode |
Automatic / Semi-automatic |
Signal Type |
Pulse, 4-20mA, RS485 |
Used in industries such as petroleum, chemical engineering, urban natural gas, and flow meter manufacturers for the verification and testing of gas flow meters. It is an essential tool to ensure the product quality, performance, and accuracy grade of flow meter manufacturing enterprises.




Copyright © Kaifeng Xinya Instrument Co., Ltd.