Precautions for Gas Mass Flow Meters

The gas mass flowmeter is generally relatively simple in application, as long as it is installed correctly, it can be put into use after simple debugging. In daily use, you only need to adjust the zero point of the meter regularly, and almost no maintenance is required in normal times. Attention should be paid to the use of gas mass flowmeters: 1. When designing, it is necessary to select a suitable flowmeter according to the specific situation, especially to understand the properties of the fluid, such as flow, temperature, pressure, density, viscosity, etc., and choose a suitable instrument according to these conditions. In addition, use products from companies with good quality and reputation to ensure good application. xuy is familiar with the design standards; at the beginning, because we were not familiar with the design standards, we designed the mass flow meter (for measuring medium liquefied gas) behind the regulating valve during the design process, resulting in the fact that the regulating valve is basically fully closed under low flow conditions, making the quality The pressure difference between the front and back of the flowmeter is too small, and the medium flowing through the flowmeter is too little or interrupted, so that the flowmeter cannot measure normally and cause measurement errors; the final solution is: when the pressure drop of the device is known in advance to a certain extent, adjust it The opening of the valve downstream of the flowmeter ensures that there is a sufficient measurement pressure difference at both ends of the flowmeter to ensure continuous measurement by the mass flowmeter to avoid measurement errors. 2. The success of the gas mass flowmeter application is directly related to the installation. In addition to the normal installation requirements, special attention should be paid to reducing the impact of vibration, because the mass flowmeter works based on the principle of vibration, and external vibration will introduce interference. Although the instrument has been designed with an integrated structure to reduce the impact of vibration interference, the smallest possible external interference is undoubtedly beneficial to accurate measurement, so try to avoid the vibration from the pipeline and the site environment as much as possible. Add fixed piers and other methods to overcome vibration interference. 3. When the instrument is put into use, the instrument must be initialized strictly according to the data in the factory calibration sheet, which is also the premise to ensure accurate measurement. 4. During the use of the instrument, it is necessary to carry out accurate zero point calibration under the conditions of use. The mass flowmeter is a high-precision measuring instrument used online. The drift of the zero point will affect the measurement results. It must be calibrated regularly for long-term use. The key point is to calibrate the zero point online. After the instrument was put into operation, two calibrations were carried out. From the results, there is a problem of zero point drift. Although the drift does not affect its actual accuracy, it also causes a certain measurement error. In this regard, the regular online calibration of the zero point should be included in the management scope of the mass flowmeter, and it should also attract the attention of all users.

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