Importance and Necessity of Mass Flowmeter Zero Calibration

The importance and necessity of mass flowmeter zero point calibration 1. Why do we need to perform zero point calibration? Starting from the principle of the Coriolis force mass flowmeter, the Coriolis force acting on the measuring tube of the flowmeter causes the deformation of the measuring tube to be affected by the structure of the flowmeter. Some stress will also be generated during the installation process, causing micro-plastic deformation of the flowmeter structure. As the stress recovers, the zero point will also drift. Secondly, the manufacturer's standard devices are generally calibrated with water. However, the media to be measured by users is very rich (about a thousand kinds). Different media have different densities, and when the volume of the measuring tube of the flowmeter is constant, the quality of the medium in the measuring tube is different. This results in a difference in the vibration frequency of the measuring tubes. And, the Coriolis force generated when the medium flows will also be different. Therefore, after the medium is determined, it is necessary to give the mass flowmeter a starting point for measurement. Therefore, zero calibration is required. 2. Under what circumstances should zero calibration be performed? After new installation or disassembly and reinstallation, after changing the measuring medium, and after the zero point drifts obviously during use. Re-calibration of the zero point is required. 3. The importance and necessity of zero point calibration Zero point calibration provides the flowmeter with a reference point for flow measurement. After the flowmeter is installed or reinstalled, zero point calibration must be performed. Otherwise, the accuracy of the measurement data of the mass flowmeter cannot be guaranteed. 4. Zero calibration method and precautions After the mass flowmeter is installed, the transmitter is powered on and preheated for more than 20 minutes. After passing, you can consider zero calibration. Zero point calibration method: Open the valve on the pipeline first, let the sensor be filled with medium and flow for more than 5 minutes, pay attention to observe the density display of the flowmeter. When the density is stable, first close the downstream valve of the flowmeter, and then close the upstream valve. During zero calibration, ensure that the upstream and downstream valves are closed tightly without leakage. After the fluid in the sensor is stable, observe the flow meter to show that the density should be very stable. Regardless of whether there is a flow value or not, it must be guaranteed to be a stable value. The zero point calibration can be carried out. Generally, the zero calibration should be performed after closing the valve for 3 to 5 minutes. The zero calibration process is generally 30 to 40 seconds. During zero point calibration, there will usually be a red light flashing or“Zero calibration in progress”text prompts, no operations can be performed during zero calibration. Generally, zero calibration can be performed twice in a row, and the results can be compared. The instrument can only be put into use after confirming that the flow rate is indeed zero (the flow rate is equal to or less than its zero instability). 5. Why is the zero point of some Coriolis mass flowmeters always running? The processing stress generated during the production process, the metallographic structure change caused by welding, and the stress generated during the installation process will all cause the zero point drift of the mass flowmeter during the working process. In order to reduce the influencing factors in the production and processing process. In the production process of mass flowmeter sensors, there is an essential process called solid solution treatment. It is mainly used to eliminate all kinds of stress and strain generated in the production process to ensure the uniform metallographic structure of the entire sensor. This ensures the stability of the zero point of the mass flowmeter.

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