Analysis of 6 Key Points of On-site Installation Requirements for Mass Flow Meters

Analysis of 6 key points of on-site installation requirements of mass flowmeters This paper starts from the working principle of mass flowmeters, analyzes the factors affecting the measurement accuracy of flowmeters, and proposes the installation, use and maintenance methods of mass flowmeters, so as to achieve smooth operation of mass flowmeters , the purpose of accurate measurement. The mass flowmeter is a new type of measuring instrument for dynamic measurement, which is widely used in the transfer measurement of fluids. In the process of use, due to improper use and the influence of various factors, the measurement accuracy of the flowmeter is reduced, and its service life is also greatly shortened. The working principle of the mass flowmeter is based on Newton's second law of motion, that is, force is equal to the product of mass and acceleration. Let's first understand the physical concept of Coriolis force. Coriolis force (riolis force, referred to as: Coriolis force) is a description of the linear motion of a particle in a rotating system due to inertia relative to the linear motion of the rotating system. He was proposed by French meteorologist Coriolis to describe the motion of the rotating system. The mass flowmeter is a measuring tube in which the fluid to be measured passes through a rotating or vibrating tube. The flow of the fluid in the tube is equivalent to linear motion. The rotation or vibration of the measuring tube will generate an angular velocity. Since the rotation or vibration is driven by an external electromagnetic field, It has a fixed frequency, so the Coriolis force experienced by the fluid in the pipeline is only related to its mass and velocity, and the product of the mass and velocity, that is, the flow velocity, is the mass flow rate to be measured. Therefore, by measuring the force of the fluid in the pipeline Coriolis force, its mass flow can be measured. The installation of mass flowmeter sensor is very important to flow measurement and cannot be ignored. In the daily work, the installation is not in accordance with the regulations or the installation is not standardized, which affects the accuracy of the flowmeter in a light or heavy way. Before installation, you should check the operating instructions in detail, and install it correctly in combination with the actual process conditions. 1. The installation location should avoid electromagnetic interference. The mass flowmeter is driven by the electromagnetic coil, and the detection signal is also sent by the detection coil. The interference of the electromagnetic field should be avoided to obtain the correct induction signal. 2. During the processing of process piping, the flanges on both sides should be parallel. The centerlines of the upstream and downstream pipelines where the sensor is installed should be on a horizontal line, and the flange planes should be parallel. 3. Install stop valve and bypass. Install shut-off valves and bypasses on the upstream and downstream pipelines of the sensor to facilitate zero adjustment, daily maintenance and to ensure that the sensor can also be in a full pipe state when it is not working. Use a regulating valve downstream of the flow meter for flow control. 4. Pay attention to the installation direction of the sensor. It is necessary to ensure that the measured medium can completely fill the sensor. For liquid, it should not collect gas, for gas, it should not accumulate liquid, and for medium with viscous, dirty, and high freezing point, it is easy to empty. Therefore, the installation direction of the sensor is different for different conveying media. different. 5. Precautions for new pipelines. For new pipelines, the sensor should be installed after pipeline presetting and pipeline purging to avoid accidental damage to the sensor due to pipeline construction and prevent debris from entering the sensor. 6. Precautions for electrical connection. Cables for power supply, sensor, transmitter and output should be laid independently to prevent mutual interference, and shielded twisted control cables should be used for signal output.

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