Interference Factors in Measurement of Mass Flowmeters and Their Treatments
We all know that mass flow meters can directly and accurately measure the quality of fluids, as well as density and temperature. In the use of the mass flow meter, only the mass flow meter is not affected by the disturbance factor, and the measured result will be more accurate. Tianchen Brace's Xiaobian summarized the disturbance factors and processing methods in the mass flowmeter measurement and is now shared with everyone.
1, the impact of vibration on the accuracy of the mass flow meter.
Treatment method: Avoid vibration interference. If it can not be avoided, isolation measures should be taken to isolate the flowmeter from the sources of vibration interference.
2. The influence of electromagnetic interference on the accuracy of the mass flowmeter.
Treatment method: The mass flowmeter should be installed away from large transformers, motors and other devices that generate large magnetic fields.
3, the impact of installation stress on the accuracy of the mass flowmeter.
Treatment methods: a. Flowmeter installation should strictly abide by the installation specification. b. After the flow meter is installed, use the communicator or the transmitter interface to call up the “zeroing menu†and record the factory default zero value. After zeroing, observe the zero value at this time. The two values ​​must be guaranteed before and after An order of magnitude, if the difference between the two values ​​is large, it means that the installation stress is too great and should be reinstalled.
4. The influence of the gas contained in the oil on the accuracy of the mass flowmeter.
Treatment methods: a. Improve the working conditions of the oil product, so that the air bubbles contained in the oil product are distributed as evenly as possible to meet the requirements for the normal metering of the flowmeter; b. Install the air eliminator upstream of the mass flowmeter to minimize gas-liquid mixing; c. Installed in strict accordance with the installation specifications of the mass flow meter: measuring oil medium flow tube downwards
5, the impact of temperature changes on the accuracy of the mass flowmeter.
Processing method: a. The effect of temperature on the metal elasticity of the flow meter measuring tube can be solved by setting the temperature correction coefficient; b. The influence of temperature on the stability of the zero point. In practical applications, the mass flow meter is required under the operating temperature condition. Field zeroing is performed to minimize the impact.
6, the impact of pressure changes on the accuracy of the mass flow meter.
Treatment method: For oil products with large changes in transmission pressure and trade delivery, a pressure transmitter must be installed downstream of the flowmeter to perform pressure compensation in real time by means of software.
7. The influence of oil density and viscosity on the accuracy of the mass flowmeter.
Treatment method: The flowmeter should be used on oils with little difference in measurement or density, and the on-line real-flow calibration must be adopted for the mass flowmeter used for the bulk oil transfer, and equipped with on-line density meter.
8. The effect of measuring tube damage or corrosion on the accuracy of the mass flowmeter.
Treatment methods: a. The front end of the flowmeter is equipped with a corresponding filter to prevent foreign matter from entering; b. Use a special material flowmeter.
Tianchen Brace is the current domestic manufacturer of mass flowmeters with the smallest diameter and stabilizes the production process of mass flowmeters. The core sensitive unit uses mechanical tooling + vacuum brazing technology to ensure product consistency. Measure the exact matching control of the pipe to ensure the symmetry of the double pipe structure. Measuring tube stress relief technology to reduce sensor drift. Vibration balance control technology ensures minimum sensor-coupled vibration. Aging technology ensures system stability and reduces system drift. Ensure stability during measurement.
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