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1. Structure and Principle of Mass Flow Meter
The structure of a mass flow meter includes U-tube, thermal, differential pressure, vibration, etc; The principle is as follows:
1. Structure of mass flowmeter
1. U-tube type U-tube mass flowmeter is mainly composed of four parts: U-tube, sensor, controller, and display. The fluid is divided into two branches in a U-shaped tube, and the flow rate is determined by calculating the transfer time of the two branches.
2、 The thermal mass flowmeter mainly consists of a thermocouple and a heater. When the fluid passes through the sensor, the heater generates heat, which is transferred to the fluid, causing the fluid temperature to rise. Thermocouples can measure temperature differences in fluids to obtain flow information.
3、 Differential pressure mass flowmeter utilizes the pressure difference generated when fluid passes through orifice plates or other flow components in pipelines. The pressure of one port will be higher than the other port, and by detecting the pressure difference between these two ports, the flow information can be calculated.
4、 The vibrating mass flowmeter detects the vibration of the fluid in the pipeline, calculates the parameters of the fluid mass, and obtains flow information.
Secondly, the principle of mass flowmeter is mainly based on the law of conservation of mass, which means that in a closed system, the mass cannot be created or destroyed, and can only move from one area to another.
. Mass flow meters detect certain properties of fluids during the process, and algorithms quantify mass flow based on these measurement results. The installation requirements for quality flow meters include:1. Th
2、 The installation of a mass flowmeter does not require a straight pipe section, but stress should be avoided when connecting the sensor to the pipeline. If there is a deviation in the concentricity between the sensor and the pipeline centerline during the installation of the mass flowmeter, it will cause stress in the vibrating tube, which will form pressure, tension, or shear forces that affect the alignment of the pipeline, cause asymmetry of the detection probe, cause zero point changes, and affect measurement accuracy.
3、 If the concentricity deviation between the pipeline and the sensor is too large, it may not be possible to adjust the zero point. Therefore, reinforcement measures should be taken to stabilize the pipeline near the instrument. When installing the flow sensor, soft connections should be used as much as possible, and flange connection screws should be evenly and symmetrically tightened. To reduce the influence of residual stress, the flow sensor needs to be calibrated for zero point after installation. To facilitate the installation and zero adjustment of the mass flowmeter, stop valves should be installed at the front and back ends of the mass flowmeter.
2. What is the working principle of a mass flowmeter
The core of a mass flowmeter is to directly or indirectly calculate the mass flow rate of a fluid by measuring the changes in physical parameters when the fluid flows through it, without the need for additional compen
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