1. Accuracy
Accuracy, also known as accuracy, refers to the degree to which the measurement results of a vortex flowmeter are close to the true value. Generally expressed as absolute or relative error:
Absolute error=measured value – true value
Relative error=absolute error/true value
Any type of flowmeter cannot accurately measure the true value of the measured parameter during measurement, only capable of making the measured value close to the true value. In practical applications, we generally use the accurate indication value of the standard instrument as the true value of the measured medium, and the difference between the indication value of the measuring flowmeter and the indication value of the standard instrument is the measurement error. The smaller the error value, the higher the reliability of the measuring flowmeter.
2. Repeatability
Repeatability refers to the percentage of the difference between the measured values and the average value relative to the maximum scale range when multiple repeated measurements are made using the same vortex flowmeter under constant measurement conditions such as pipe diameter, medium flow rate, temperature, and pressure. This is an important indicator reflecting the stability of vortex flow meters, which generally needs to be inspected during instrument operation and daily calibration.
3. Sensitivity
Sensitivity refers to the sensitivity of a vortex flowmeter measurement. The ratio of the variation in the output of vortex flow meters commonly used in the industry to the variation in the measured parameters that cause these changes is expressed. We know that an integrated vortex flowmeter with temperature and pressure compensation function can simultaneously measure temperature, pressure, and flow, and the sensitivity of multiple parameters often more easily reflects the performance of the flowmeter.
4. Response time
When the parameters of the measured medium change, the displayed value of the vortex flowmeter can only be accurately expressed after a period of time, and the lag time between this period and the measured parameter change is the reaction time of the vortex flowmeter. In fact, there are also response times in other instruments, some expressed as time constants, such as thermal resistance temperature measurement, and some expressed as damping time, such as ammeter resistance measurement, and so on.
5. Zero drift and range drift
Zero drift and range drift refer to the percentage of average change relative to the range after multiple measurements of the relative zero and maximum range confirmed by the vortex flowmeter.
Qingdao Hesheng Measurement and Control has been committed to the research and production of flow meters for many years, accumulating rich product experience. If you have any questions regarding the selection, installation, use, and after-sales maintenance of vortex flow meters, please feel free to contact Qingdao Hesheng Measurement and Control at any time
Post time: 21-08-23