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Error theory of flowmeter and instrument accuracy

Author: Release date: 2015-03-04 11:45:37 Source: Shanghai Cixi View: 275
Basic error of flowmeter:
Basic error, also known as citation error or relative error, is a simplified relative error. The basic error of the instrument is defined as:
Basic error = (maximum absolute error / instrument range) * 100 = (indication value of detection instrument - true value to be measured) max / (upper limit of measurement - lower limit of measurement) * 100%
Accuracy
In order to facilitate the transmission of measurement value, the state has stipulated the accuracy (accuracy) grade series of instruments. After removing the "±" and "%" marks from the basic error of the instrument, it can be set into the national unified instrument accuracy class series.
At present, the commonly used Accuracy grades of instruments produced in China are 0.005, 0.02, 0.05, 0.1, 0.2, 0.4, 0.5, 1.0, 1.5, 2.5, 4.0, etc. If the basic error of a temperature measuring instrument is ± 1.0%, the accuracy level of the instrument is considered to be in line with class 1.0. If the basic error of a temperature measuring instrument is ± 1.3%, the accuracy level of the instrument is considered to be 1.5.
?????? The accuracy of 10ml / pulse and 100ml / pulse was compared
Take the electric remote transmission wet gas flowmeter with the maximum flow rate of 500L / h to operate for 1 hour under the maximum flow rate as an example
In the process of continuous operation, the electric remote transmission wet gas flowmeter will not produce measurement error, but there will be a pulse error in the first hour of operation. Under the maximum flow rate, for the electric remote transmission wet gas flowmeter of 10ml / pulse, 50000 pulses per hour, the relative error is 1 × 50000 × 100% = 0.002%; For 100ml / pulse electric remote transmission wet gas flowmeter, 5000 pulses can be generated per hour, the relative error is 1 ÷ 5000 × 100% = 0.02%; the mechanical error of wet gas flowmeter is ± 1%, so the electrical error of 100ml / pulse electric remote transmission wet gas flowmeter is far less than the mechanical error, which can fully meet the requirements.
??? System error of flowmeter (measurable error)
Systematic error is caused by some fixed reasons. In repeated measurement, it will be repeated, the influence of the measurement results is relatively constant, and the size has a certain rule, its size and positive and negative can be measured, so it is also called measurable error. The measurement error of wet gas flowmeter is usually caused by machining process, which is system error and can be corrected. Random error (accidental error)
Random error is the error caused by some uncontrollable random (accidental) factors (such as the change of measurement environment, the change of instrument performance, the difference of measuring personnel, etc.), its value is sometimes large and sometimes small, sometimes positive and sometimes negative, which is difficult to control and cannot be corrected.
Shanghai Cixi focuses on Flowmeter Industry, professional sales of wet gas flowmeter, elliptical gear flowmeter, Coriolis mass flowmeter, Tel: 021-57632436

The above is Shanghai Cixi's introduction of flowmeter error theory and instrument accuracy. I hope it can help you. If you still have related product problems, you can call the page for consultation! The company provides 24-hour service!

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