In fact, low-temperature target flowmeter is widely used to calculate the total flow, and it is also the meaning of differential pressure flowmeter. Everyone can go through appropriate speculation to implement other differential pressure instruments.

During the on-site measurement period of V-cone Flowmeter, there are often some objective factors that lead to a large deviation in the measurement of adverse effects. The main method of measuring precision of V-cone Flowmeter at the lower maintenance port is recommended below for everyone:

1. V-cone Flowmeter shall be calibrated one by one. As everyone knows, the standard V-cone can be applied immediately without real flow calibration, as long as the design scheme, production and manufacturing are in accordance with relevant standards. Because the discharge index can be calculated immediately by the mobile phone software, but there is still certain difference between the analogy imagination of the carry over of the carry over machine and the on-the-spot situation. Therefore, in order to measure the precision of the maintenance port, it is proposed to carry out real flow calibration for each flowmeter, check the calibrated discharge index and the adverse impact of the carry over, calculate the error and carry out the correction.

2. There is a clear correlation between the flow coefficient and the Reynolds number of the high temperature target flowmeter. When the mass flow changes, the Reynolds number changes in direct proportion, thus causing the change of the flow coefficient

3, The harm and correction of temperature to V-cone Flowmeter, the change of hydrodynamics temperature causes the change of relative density, and then causes the correlation change between gas pressure and total flow, and then, the change of temperature causes the change of nominal diameter of pipeline, the change of V-cone drilling, and the correction of temperature change, that is to say, the temperature on the spot is measured by the temperature instrument panel, and then the temperature is keyed into the secondary instrument panel for correction Deviation caused by degree change..

4. Expansibility is positive. When V-cone Flowmeter is used to measure the pressure of steam and gas, it is necessary to carry out the expansibility and positive effect of hydrodynamics. The detailed positive effect index can refer to the guide of saving installation design scheme.

5. Carry over of steam mass flow. When measuring steam with digital target flowmeter, first calculate the total flow value by gas pressure signal, then calculate the relative density by steam temperature and working pressure value, so as to carry over the total flow quality of steam.