Vortex flowmeter technical points

Project Overview

1. Accuracy

Accuracy is also called precision, that is, how accurate the measurement results of the vortex flowmeter are close to the true value. Generally expressed as absolute error or relative error:

Absolute error = measured value - true value

Relative error = absolute error/true value

Any kind Flowmeters cannot measure the true value of the measured parameter absolutely accurately during measurement. They can only try to make the measured value close to the true value. In practical applications, we generally use the indicated value of a standard instrument with higher accuracy as the true value of the measured medium, and the difference between the indicated value of the measuring flow meter and the indicated value of the standard instrument is the measurement error. The smaller the error value, the higher the reliability of the measuring flow meter.

2. Repeatability

Repeatability refers to the use of the same vortex flowmeter for multiple measurements under the condition that the pipe diameter, medium flow rate, temperature, pressure and other measurement conditions remain unchanged. Repeated measurements, the percentage of the difference between each measured value and the average value relative to the maximum scale range. This is an important indicator reflecting the stability of the vortex flowmeter, and generally needs to be inspected when the instrument is put into operation and daily calibration.

3. Sensitivity

Sensitivity refers to the sensitivity of the vortex flowmeter measurement. It is commonly used in the industry to express the ratio of the changes in the output of the vortex flowmeter to the changes in the measured parameters that cause these changes. We know that an integrated vortex flowmeter with temperature and pressure compensation function can measure temperature, pressure, and flow at the same time. The sensitivity of multiple parameters often makes it easier to reflect the performance of the flowmeter.

4. Response time

When the parameters of the measured medium change, the displayed value of the vortex flowmeter will always take a period of time to be accurately expressed. This section and The lag time when the measured parameter changes is the reaction time of the vortex flowmeter. In fact, other instruments also have response time. Some are expressed by time constants, such as thermal resistance temperature measurement, and some are expressed by damping time, such as ammeter measurement of resistance, etc.

5. Zero point drift and range drift

Zero point drift and range drift refer to the relative change of the average change value after multiple measurements of the relative zero point and maximum range confirmed by the vortex flowmeter. Percentage of range.

Supmea Measurement and Control has been committed to the R&D and production of flow meters for many years and has accumulated rich product experience. If you have any questions about the selection, installation, use and after-sales maintenance of vortex flow meters, please feel free to contact us~