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1. Operating principle of metal tube float flowmeter remote transmission module
The core of the operation of the metal tube float flowmeter remote transmission module is to collect float displacement signals through non-contact magnetic coupling, and output standardized electrical signals after signal conversion, realizing remote collection and transmission of flow data without contact with the measured fluid throughout the process.
1. Principle of magnetic coupling signal acquisition (1) Basic linkage logic 1 The float of the metal tube float flowmeter is embedded with a permanent magnetic steel inside. When the measured fluid flows through the conical metal tube, the float moves up and down along the axis with the change of flow rate. The displacement of the float is in a fixed linear relationship with the fluid flow rate. 2. The remote transmission module is installed in the protective shell outside the metal tube and is equipped with magnetic sensing components (such as Hall sensor array and reed switch group) inside. Through non-contact magnetic field coupling, the magnetic field displacement of the float magnetic steel is induced. 3. The magnetic sensing component converts the magnetic field displacement into a corresponding weak electrical signal, directly reflecting the real-time position of the float.
II. Signal Conversion and Remote Transmission Process (1) Signal Conditioning Calibration 1 The collected weak electrical signals will enter the signal conditioning circuit built into the remote transmission module to complete amplification, filtering, linear compensation, and convert the float displacement into standard flow values. 2. For different application scenarios, the conditioned s
III. Key Usage Restrictions 1 The remote transmission module should avoid strong magnetic field environments (such as around large motors and transformers), otherwise it will interfere with the induction accuracy of the magnetic sensing components. 2. Explosion proof remote transmission modules should comply with the GB 3836 series explosion-proof standards (the latest version in 2023) and be suitable for measurement scenarios of flammable and explosive fluids. 3. During installation, it is necessary to ensure that the module is tightly attached to the outer wall of the metal tube to avoid magnetic field shielding deviation affecting measurement accuracy.
2. How to collect the 4-20mA signal output by the flowmeter to the computer
HP34970A is a lightweight and portable data automatic acquisition unit with high measurement accuracy. The built-in digital voltmeter has an accuracy of 6.1/2.
. It can directly measure the temperature detected by thermocouples, resistance thermometers, thermistors, and other physical quantities such as DC voltage, AC/DC current, surge resistance, frequency, and period. It also has digital input/output and control functions. You can connect the 4-20mA signal output of the flowmeter to the corresponding interface (channel) of the acquisition instrument, and input the flow r
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