Main factors for the decrease of gas measurement accuracy by V-cone flowmeter

Although the V-cone flowmeter is a relatively advanced measuring tool for measuring gas in differential pressure flowmeters. However, due to various reasons on site, the on-site measurement accuracy has not been improved, and the main reason is still determined by the measuring medium. Here are a few key points to analyze the main influencing factors:

1. The impact of gas density change on the V-cone flowmeter.

From the flow formula, it can be seen that density and differential pressure are in the same important position. Therefore, if the density measurement is inaccurate, even if the differential pressure is measured very accurately, the entire measurement system cannot obtain high accuracy. During normal calculations, the density value is usually fixed. This does not have a great impact on a single gas source, but if it is mixed with some water, liquefied petroleum gas and other gas sources, the error will be quite large.

2. The impact of impurities in gas.

As we all know, the composition of gas is very complex, so under long-term use, the cone diameter will directly affect the measurement accuracy due to the attachment of impurities.

3. The impact of secondary instruments.

The errors of secondary instruments such as differential pressure transmitters, pressure transmitters, flow integrators, and the leakages at the connections and joint conversions between them also have the most direct impact on the accuracy of the V-cone flowmeter and should be given great attention.