What are gas flowmeters commonly used for?

Sonic nozzle gas flow standard device is widely used at home and abroad to test gas flowmeters. The device realizes the wide-range flow inspection range by supporting multiple console positions and combining multiple sonic nozzles as scales. Taking into account the temperature, pressure and other influencing factors, the accuracy of the test is improved. At the same time, it adopts advanced vacuum generating structure to ensure the accuracy of ultra-small flow inspection. The test shows that the standard device can meet the verification of various flowmeters and has certain practical effects. Since the sonic nozzle has the characteristics of simple structure, strong performance, small size, no moving parts and high accuracy level, the number of users who use it as a laboratory offline gas flow standard and online natural gas measurement standard is increasing. The negative pressure sonic nozzle gas flow scale device has obvious advantages in flow control, accuracy, compliance, durability, economy, operation and maintenance. But at the same time, it should be considered that during the development verification/calibration process, factors such as environmental conditions, temperature and pressure measurement, personnel operating level, and building maintenance will affect the accuracy of the measurement results. Of course, in improving the stability of the device, There are still many issues to be aware of in reducing the uncertainty of the measurement results. The assembly should be placed in a laboratory with sufficient space, cleanliness and good temperature conditions. The temperature, relative humidity, atmospheric pressure, power supply, external magnetic field, machine vibration and noise in the verification environment conditions meet the requirements of the response verification routine. It is required that the process parameters of the gas (atmosphere) used for verification, especially the rate of change in temperature and pressure, do not exceed the requirements of the regulations.

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