What are the requirements of the gas flowmeter for the measured medium?

Even if the gas flowmeter is properly installed and the zero point is adjusted normally, this problem still exists. Especially when measuring wet saturated steam, this kind of problem is even more prominent. It can only be solved by increasing the small signal cutoff value, but often results in normal traffic being cut off. Regarding the problem that the V-cone flowmeter measures the false flow rate of steam caused by the pressure measurement at the tail of the V-cone, its structure has been improved, and the measurement port of the negative pressure end has been changed to the pipe wall, and this method is called“Pipe wall pressure”, is the tail pressure taking structure, and Figure 2 is the pipe wall pressure taking structure. The V-cone flowmeter solves the above problems by taking pressure from the pipe wall. What are the requirements of the gas flowmeter for the measured medium? If there is no bypass valve, slowly open the upstream valve, and then slowly open the downstream valve. Be careful not to make the impeller suddenly reach a high speed. When measuring liquefied gas and gasoline, keep the pressure close to the flowmeter 0.1 MPa higher than the vapor pressure of the liquid to prevent the impeller from increasing in volume when the liquid is vaporized, causing excessive wear of the bearing in a short period of time. The temperature and environmental conditions of the liquid to be tested should comply with the provisions of this instruction manual. Supply power to the flow totalizer. When the downstream valve is closed, the flow totalizer should display zero flow. When the flowmeter is put into use, all the bypass valves should be opened first, then slowly open the downstream valve of the flowmeter, then slowly open the upstream valve until fully open, and then slowly close the bypass valve. The instrument coefficient of the flowmeter is obtained by calibration with water at normal temperature before leaving the factory. When in use, for the accuracy not higher than 0.5, the viscosity of the measured liquid is lower than 5*10-6m2/S (μm2/s=cst), there is no need to re-calibrate. When the viscosity of the measured liquid is high, it is recommended to use the actual measured liquid or a substitute liquid with equivalent viscosity for calibration to obtain the instrument constant or use the correction curve method for correction. When accurate measurement is required, the following error corrections can be made. In the use of the flowmeter, it has indeed overcome and solved many shortcomings and deficiencies of the traditional differential pressure instrument, and has been well received by the majority of users. However, certain problems have arisen, the common problem being in measuring the steam flow. During the period of pipeline shutdown under the condition of intermittent steam use, sometimes the instrument always has false flow display of different sizes, and there is indeed a differential pressure in the V-shaped cone flowmeter.

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