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『Flow meter remote transmission』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
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. Doppler Open Channel Flow Meter
3. Reasons for Inconsistencies between Flow Meter On site and Remote Transmission
The flow meter displays instantaneous and cumulative flow rates. If a 4-20mA or pulse signal is used for remote transmission, there will be some errors in the conversion of the remote instrument, resulting in inconsistent instantaneous flow rates (generally not much difference). However, using a 4-20mA signal for cumulative quantity calculation will be completely different from the on-site cumulative quantity, not only caused by errors, but also by different starting points for accumulation.
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