Flow meter calibration | How to calibrate a flow meter?

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1. What is the function and usage of linearity line correction for ultrasonic flow meters?

Improve the accuracy of results and determine the correction point.

1、 Linearity line correction is based on the difference between actual measurement values and standard values, establishing a correction curve to adjust the measurement results. The correction curve can be adjusted according to the actual situation to improve the accuracy and reliability of the measurement results.

2、 Based on the measurement range and practical application requirements of the ultrasonic flowmeter, a series of correction points are selected. At each correction point, a standard flowmeter or other reliable flow measurement equipment is used for calibration to obtain the standard value. The ultrasonic difference virtual wave flowmeter is used for actual measurement, and the measured values are recorded. Based on the correction curve, the measurement results are corrected.

2. How to calibrate a flowmeter (split/integrated volume correction instrument)? The instrument calibration of flow meters (split/integrated volume correction instruments) requires calibration of pressure, temperature, and flow modules according to the equipment type (split or integrated) and specific technical parameters to ensure accurate sensor data and meet calculation requirements. The following is the specific calibration process:

1. Calibration of split volume correction instrument (Elster EK220/230/260, ITRON CORUS) Pressure calibration technical requirements: calibration range of 0.5-4MPa (absolute pressure), uncertainty level of 0.1, only verifying 3 points of the upward stroke (such as 0.5MPa, 2MPa, 4MPa). Process: Confirm interface

type (M141.5 or M201.5, EK series requires confirmation of sealing type). Connect a standard pressure source (such as a high-precision pressure gauge) to the calibrated equipment, apply pressure point by point, and record the displayed value of the equipment. Compare the standard value with the equipment value, calculate the error and adjust it to the allowable range. Limitation: Up to 3 devices can be calibrated at a time. Temperature calibration technical requirements: Calibration points are -10 ℃, 30 ℃, and 60 ℃, and the temperature is controlled using a constant temperature bath. Process: Insert the device temperature probe into the constant temperature bath, wait for the temperature to stabilize, and then read the device display value. Compare the standard thermometer (installed on the flange side) with the equipment value and correct the deviation of three temperature points. Interface: M141.5 or M201.5 (EK series requires confirmation of sealing type). Flow calibration technology requirements: Simulate flow signals (0.2/0.4/0.6/0.8/1Hz) through a frequency generator, read the equipments working status, standard status, and conversion coefficient. Process: Connect the frequency generator to the device being calibrated, set the frequency, and record the feedback data from the device. Verify the flow calculation logic (such as whether pressure and temperature compensation are correctly applied).

2. Calibration of integrated volume correction instruments (Cangnan LLQC/LWQC, Tianxin TBQZ) Pressure calibration technical requirements: Calibration range of 5-40 bar (absolute pressure bench virtual force), uncertainty level of 0.1, and verification of 3 points of upward travel (such as 5 bar, 10 bar, 40 bar).

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