Accurate measurement of flow is very important, using flow sensors to monitor the flow of liquid or gas in the metered pipeline, and is widely used in industrial control and civil facilities.
Flow Sensors
Flow is an important parameter in industrial production. In the industrial production process, many raw materials, semi-finished products, and finished products appear in a fluid state. The flow of fluid is the key to determining the composition and quality of the product, and is also an important basis for production cost accounting and rational use of energy. In addition, in order to ensure the reliability of the manufacturing process and the reliability of the test results, many processes require the inflow and outflow of liquid or gaseous media to be consistent. In addition to pressure and temperature, the flow measurement is also very important in the automated production process. Therefore, the measurement and control of flow is an important part of the automation of the production process.
A flow sensor is a sensor that senses the flow of fluid and converts it into a usable output signal. The sensor is placed in the path of the fluid, and the change in flow is measured by the interaction of the fluid with the sensor and the sensor. According to the definition of flow, it is mainly used for the detection of gas and liquid flow.
Classification of flow sensors:
The flow sensor can be divided into the following types according to different detection methods, and the corresponding sensors perform work:
Electromagnetic detection method: electromagnetic flow sensor
Mechanical detection method:
Volume flow sensor
2. Vortex flow sensor
3. Turbine flow sensor
Acoustic detection method: super-wave wave flow sensor
Throttle detection method: differential pressure flow sensor
Let's talk about the differences between the above sensors:
First, the electromagnetic flow sensor:
Definition: The electromagnetic flow sensor consists of a sensor that directly contacts the pipe medium and a signal conversion at the upper end. It is based on Faraday's law of electromagnetic induction and is used to measure the flow of conductive liquid with a conductivity greater than 5 μs/cm. It is a meter for measuring the flow of conductive media. In addition to measuring the flow rate of general conductive liquids, it can also be used to measure strong corrosive liquids such as strong acids and alkalis, and liquids containing two liquid suspensions, such as mud, pulp, pulp, etc.
Principle: The working principle of the electromagnetic flow sensor is based on Faraday's law of electromagnetic induction. In the electromagnetic flow sensor, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant electromagnetic field. When a conductive medium flows, an induced voltage is generated. The two electrodes inside the pipe measure the induced voltage generated. The measuring tube is electromagnetically isolated from the fluid and the measuring electrode by a non-conductive inner liner (rubber, Teflon, etc.).
When the electric liquid moves in the magnetic field as the cutting magnetic field line, the induced potential is generated in the conductor. The induced potential E is: E=KBVD where: K---meter constant B---magnetic induction intensity V---measure the average in the cross section of the pipeline Flow rate D---measure the inner diameter of the pipe section
The magnitude of the induced potential is related to the magnetic induction, the diameter of the tube, and the flow rate of the fluid. which is:
Introduction
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