Analyze the reasons that affect the reproducibility of orifice flowmeters

The orifice plate flow meter mainly consists of a test piece and a secondary device, so the maintenance is simple and convenient. Simple structure, high stability, easy to use and high precision. The orifice flowmeter throttling device and the differential pressure transmitter can be used to measure the flow of liquid, steam and gas. The orifice flowmeter is widely used in petroleum, chemical, metallurgy, electric power, light industry and other departments. In the application process, the repeatability of orifice meter is especially important, so in the actual use, we must pay attention to the following aspects:

1. The sharpness of the entrance is right, and the diameter of the pipe is inconsistent with the calculation.

2, the product thickness error; throttle accessories produce steps, eccentric;

3, orifice plate upstream end flatness; ring chamber size, eccentricity;

4, the choice of pressure location; whether the welding seam is prominent;

5. Check if the pressure hole is normal and blocked.

The above problems may affect the repeatability of the orifice plate. The repeatability is determined by the principle of the instrument itself and the manufacturing quality. It is an important indicator in process control applications. Accuracy, in addition to being dependent on repeatability, is related to the calibration system. In practical applications, the excellent repeatability of the meter is disturbed by many factors, including fluid viscosity, density, etc., which can affect the measurement accuracy. This effect is even more pronounced if the output characteristics of the instrument are non-linear. Therefore, precautions must be taken when selecting and applying orifice flowmeters.

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