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Flow meter correction

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1. The measurement results of ultrasonic flow meters need to be corrected by multiplying by several times.

The measurement results of ultrasonic flow meters usually do not need to be corrected by multiplying by a fixed multiple. The correction is mainly achieved through parameter calibration and coefficient adjustment, rather than simply multiplying by a delay factor. 1. Correction of core principle: Ultrasonic flowmeter calculates flow velocity by measuring the propagation time difference of ultrasonic waves in the fluid. Its correction needs to be achieved through the following methods: • Instrument coefficient (K coefficient): calibrated at the time of flowmeter delivery, used to convert the measured time difference into the actual flow value (formula: Q=K × Δ T). Users can directly modify the K coefficient value through the hardware menu or software interface (such as adjusting from 1.000 to 0.985) • Pipeline parameter calibration: Accurate input of pipeline outer diameter, wall thickness, lining material, and thickness is required, and errors in these parameters can cause systematic deviations in measurement errors. 2 Typical Correction Scenarios and Methods | Correction Scenarios | Correction Objects | Specific Operations | |: --- |: --- | | Installation Conditions Not Compliant | Measurement Values | Readjust Sensor Installation Distance, Angle, or Position to Meet Straight Pipe Section Requirements (First 10D, Second 5D) | | Fluid Property Changes | Sound Velocity Compensation | Update Fluid Type, Temperature, and Concentration Parameters in the Instrument, System Automatically Calculate Sound Velocity Changes | Long term Use Drift | Instrument Coefficient | Use Portable Flow Meter for On site Comparis

Flow meter correction
on, Adjust K Coefficient According to Difference Ratio (If Deviation+2%, K Coefficient × 0.98) | | Pipe Wall Scaling/Corrosion | Pipeline Parameters | Actual Measurement of Current Pipeline Inner Diameter and Wall Thickness, Update Pipeline Parameter Settings | 3 Dangerous operation warning: It is prohibited to modify the K coefficient arbitrarily without a clear diagnosis of the cause of the fault: - The coefficient adjustment needs to be verified based on the standard table Li method (comparative verification) or the volumetric method - Blindly multiplying by multiples may lead to the expansion of measurement errors, especially in trade settlement scenarios, which can cause serious disputes The latest technical standards are based on JJG 1030-2020 "Ultrasonic Flow Meter Calibration Regulations" issued by the State Administration for Market Regulation in 2020: - The relative indication error limit of the flow meter inspected during use is ± 2.5% - Correction must be completed by qualified institutions using standard devices within the validity period of the calibration - After on-site correction, a calibration certificate needs to be reissued. If self adjustment is required, please first use the instantaneous flow diagnosis function to check the signal strength (Q value>70) and transmission time ratio (100 ± 5), confirm that the hardware is normal, and then consider parameter correction.

2. How to perform zero calibration on differential pressure flow meters?

Firstly, check if there is any leakage in the valve. If so, if there is still medium flow in the pipeline after the valve is closed, the valve needs to be replaced.. After confirming that there is no leakage in the valve, open the high and low

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