The orifice flowmeter is mainly composed of a primary detection part and a secondary device, so the maintenance is simple and convenient. The structure is simple, the stability is high, the use is convenient, and the precision is high. Orifice flowmeter throttling device and differential pressure transmitter can be used to measure the flow of liquid, steam and gas. Orifice flowmeter is widely used in petroleum, chemical, metal, electric power, light industry and other sectors. In the application process , The repeatability of the orifice flowmeter is particularly important, so in the actual use process, we must pay attention to the following aspects:1. The sharpness of the entrance right angle, the pipe diameter size does not match the calculation;2. Error of product thickness; steps and eccentricity of throttle accessories;3. The flatness of the upstream end of the orifice flowmeter; the size of the annular chamber produces steps and eccentricity;4. The selection of pressure location; whether the welding seam is prominent;5. Whether the pressure tapping hole is standardized 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. The accuracy is not only dependent on repeatability, but also related to the value calibration system. In practical applications, the excellent repeatability of the instrument is disturbed by many factors including fluid viscosity, density and other changes, which will affect the measurement accuracy. If the output characteristics of the meter are non-linear, this effect is more prominent. Therefore, precautions must be taken when selecting and applying orifice flow meters.
Post time: 21-09-21