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Industry Information
The performance and installation of the differential pressure transmitter directly affect the overall accuracy of the V-cone flowmeter
2012-3-10 10:34:13

测量误差主要来源安装不规范,维护不及时或工艺系统工况参数变化引起的。 The main sources of measurement errors of V-cone flowmeters are caused by improper installation, untimely maintenance, or changes in process system operating parameters. Today I will summarize the faulty operation of the V-cone flowmeter.

1. The first is the irregular installation. The irregular installation of V-cone flowmeters may be caused by the following reasons: insufficient straight pipe sections before and after the process pipeline, causing fluid instability and affecting measurement accuracy; there are problems with the installation direction, of course, this The problem will basically not occur unless it is caused by a mistake in the field installation; when measuring steam, the condensing device is not cooled thoroughly and the installation height is different2, followed by the misoperation of the secondary meter, the V-cone flowmeter is used in the field When it is used, a differential pressure transmitter must be equipped for normal use. Therefore, the performance and installation of the differential pressure transmitter directly affect the overall accuracy of the V-cone flowmeter. 在测量混合流体的方面,还是有成功运行经验的,但是要注意差压变送器的防腐,定期的打开排污阀。 The V-cone flowmeter still has successful operation experience in measuring mixed fluids, but it is necessary to pay attention to the corrosion protection of the differential pressure transmitter and periodically open the drain valve. 3. Finally, the impulse tube is blocked or leaked. When measuring viscous and crystalline medium, the impulse tube and the shut-off valve are often blocked due to heat tracing and other reasons, so that the differential pressure input to the differential pressure transmitter changes. Measurement error. Elimination methods are to conduct inspections on time, clean the sewage or clean with a hand pressure pump. When measuring high-pressure or corrosive media, pressure leaks or joints often leak, causing pressure loss and differential pressure deviation. The solution is to conduct inspections on time and plug the loopholes. Through the above description, our on-site maintenance technicians can easily find the fault of the V-cone flowmeter and reduce the economic loss on site.


技术特点: V cone flowmeter technical characteristics:

1. Low installation requirements: straight 0 ~ 3D straight pipes, and rear 0 ~ 1D straight pipe sections; 2. Wide range ratio: usually 10: 1, choosing the right parameter can achieve up to 50: 1; 3. Small pressure loss: The same β value, the pressure loss is 1/3 ~ 1/5 of the orifice plate; 4. Wear resistance: After the streamlined cone is throttled, a vacuum layer effect is generated on the surface of the cone, making the cone difficult to wear;
5. Non-clogging and non-adhesion: The cone-shaped thorough purging design avoids the retention of residues, condensates or particles in the fluid; 6. Long-term stability: The β value can be unchanged for a long time and ensure long-term accurate measurement; 7. High accuracy: 0.5 level; 8. Good repeatability: better than 0.1%; 9. Signal stability: "Signal fluctuation" is 1/10 of the orifice flowmeter; 10. Wide range of β value: V cone flow sensor is unique The geometric shape allows a wide range of β values; 11. Wide caliber range: DN25 ~ DN2000; 12. Measurable high-temperature and high-pressure media: Working temperature up to 850 ° C and maximum pressure 40MPa; 13. Measurable dirty media (coke oven) Gas, blast furnace gas, raw oil, residual oil, etc.); 14, can measure gas-liquid two-phase media (humidity, condensate, etc.);