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Electromagnetic flowmeter for measuring low conductivity and method for measuring conductivity thereof

A technology of electromagnetic flowmeter and low conductivity, which is applied in the direction of measuring flow/mass flow, measuring device, liquid/fluid solid measurement, etc. It can solve the problems of low measurement accuracy and limit the use range of electromagnetic flowmeter, and achieve measurement accuracy. High, control air traffic control signal interference, improve the effect of measurement accuracy

Inactive Publication Date: 2020-06-05
SHANGHAI INST OF MEASUREMENT & TESTING TECH
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AI Technical Summary

Problems solved by technology

[0004] At present, the measurement accuracy of electromagnetic flowmeters for liquids with low conductivity will be an order of magnitude lower, which greatly limits the scope of use of electromagnetic flowmeters

Method used

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  • Electromagnetic flowmeter for measuring low conductivity and method for measuring conductivity thereof
  • Electromagnetic flowmeter for measuring low conductivity and method for measuring conductivity thereof
  • Electromagnetic flowmeter for measuring low conductivity and method for measuring conductivity thereof

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Embodiment Construction

[0032] Electromagnetic flowmeters for measuring low conductivity, such as Figure 1~7 As shown, it includes sensor unit, signal processing unit, V / F conversion unit, ARM module, empty traffic detection unit, LCD display module and RS485 communication module. The sensor unit is connected with a working power supply, which provides the basis for the work of the sensor unit Voltage.

[0033] The signal output end of the sensor unit is connected to the signal input end of the signal processing unit, the signal output end of the signal processing unit is connected to the signal input end of the V / F conversion unit, the signal output end of the V / F conversion unit is connected to the ARM module, and the ARM module is connected to There is an LCD display module and an RS485 communication module, the signal output end of the sensor unit is also connected to the empty pipe detection unit, and the signal output end of the empty pipe detection unit is connected to the signal input end of...

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PUM

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Abstract

The invention belongs to the field of magnetic flowmeters, and discloses an electromagnetic flowmeter for measuring low conductivity. The electromagnetic flowmeter comprises a sensor unit, a signal processing unit, a V / F conversion unit and an ARM module, and the sensor unit is connected with a working power supply. The sensor unit is connected with the signal processing unit, the signal processing unit is connected with the V / F conversion unit, and the V / F conversion unit is connected with the ARM module. The signal processing unit comprises a pre-amplification module, a low-pass filtering module and a post-amplification module. The invention further discloses a low-conductivity measuring method using the electromagnetic flowmeter. According to the electromagnetic flow meter, weak flow signals can be effectively amplified through three-stage amplification, meanwhile, the measurement precision of the electromagnetic flow meter is guaranteed, and the electromagnetic flow meter has the advantages of being small in imbalance, small in temperature drift, good in linearity and stable and adjustable in gain.

Description

technical field [0001] The invention belongs to the field of electromagnetic flowmeters, in particular to an electromagnetic flowmeter for measuring low electrical conductivity and a measuring method thereof. Background technique [0002] The basic principle of electromagnetic flowmeter is Faraday's law of electromagnetic induction. The excitation module of the electromagnetic flowmeter generates a magnetic field excitation intensity B. When the conductive fluid flows at a speed v in a pipe with a diameter of D, the induced potential E=kBVD between the two measuring electrodes, k is a fixed coefficient, that is, the sensor coefficient. Traditional electromagnetic flowmeters cannot measure liquids with conductivity lower than 10μs / cm. [0003] In the industrial production process, the flow rate is an extremely important thermal parameter and one of the important measurement parameters in the process control of industrial and agricultural production. Electromagnetic flowmet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/60
CPCG01F1/60
Inventor 李雪菁王灿姚新红李海洋吴锦川
Owner SHANGHAI INST OF MEASUREMENT & TESTING TECH
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