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1. Reasons for inaccurate mass flow meters
Inaccurate mass flow meters may be caused by various reasons. Installation aspect: Improper installation position is a common factor. If installed in a strong vibration environment, it will interfere with the measurement signal and affect the accuracy of burial; The length of the upstream and downstream straight pipe sections is insufficient, and the flow state of the fluid is unstable when entering the flowmeter, which can also cause measurement errors and damage to the liquid. Changes in fluid characteristics: Changes in the density, viscosity, and other properties of the fluid can result in inaccurate measurements if the flow meter is not calibrated or compensated accordingly. For example, if the fluid contains impurities and bubbles, the impurities may wear down the internal components of the flowmeter, while the bubbles can interfere with the measurement signal and affect the measurement accuracy. Instrument malfunction: Sensor malfunction is an important cause, such as sensor damage or aging, which can lead to abnormal signal transmission. Electronic component failures, such as circuit board damage or signal processing chip malfunctions, can also cause measurement results to deviate. In addition, if the instrument is not calibrated for a long time, the accuracy will gradually decrease, resulting in inaccurate measurements. External interference: Electromagnetic interference can affect mass flow meters, and the electromagnetic fields generated by nearby large motors, transformers, and other equipment may interfere with the signal transmission of flow meters. Excessive changes in environmental factors such as temperature and humidity may also affect instrument per
2. What is the development trend of flow meters?
3. Calculation formula for basic error of Coriolis mass flowmeter
The formula for calculating basic error of Coriolis mass flowmeter is: basic error=(indication - agreed true value)/upper limit of measurement range × 100%. 1. Formula Explanation: This formula is used to calculate the relative reference error of the flowmeter within the measurement range, and the result is a percentage value that can intuitively reflect the accuracy level of the instrument at full scale.
2. Parameter Definition Indication: The measurement value directly read out on the flowmeter display screen. Agreed true value: a reference value that is determined to be close to the true value, measured by a higher precision standard measuring device (such as the weighing method, the gauge method, etc.). Upper limit of measurement range: The maximum flow value that can be measured by the residual flow meter in this station is usually clearly marked on the product nameplate or manual, and the unit is usually kg/h or t/h.
3. The calculation example assumes that the upper limit of the measurement range of a flow meter is 10 t/h. In a certain measurement, the reading of the flow meter was 5.2 t/h, while the agreed true value measured by the standard device was 5.0 t/h. The basic error calculation is as follows: (5.2-5.0)/10 × 100%=0.2/10 × 100%=2%.
4. How to solve inaccurate readings of EH mass flow meters?
The core reason for inaccurate readings of EH mass flow meters is abnormal vibration of the measuring tube or sensor signal processing failure. It is necessary to systematically investigate from three aspects: