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Magnetic Flow Meter

Overview

A magnetic flow meter (mag flow meter) measures the flow rate using Faraday's law of electromagnetic induction. It comprises coils generating a magnetic field and electrodes sensing induced voltage from conductive fluids. The voltage is proportional to the flow rate, allowing accurate measurement. A transmitter processes signals to calculate flow. Mag flow meters offer high accuracy, reliability, and versatility for various industries like water management and chemical processing. They handle turbulent flow and slurries with low maintenance due to no moving parts. However, they require conductive fluids, limiting their use in non-conductive fluid applications. Mag flow meters provide precise flow measurements for industrial and commercial purposes.

System Benefits:

  • The MCU provides an integrated 16-bit SAR ADC, 24-bit sigma-delta ADC, and op amp with low power.
  • 3.3V powered single transceivers meet both the RS-485 and RS-422 standards for balanced communication.
  • The dual amplifiers feature low noise, low input bias current, and low offset and temperature drift.

Block Diagram

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4:3 ratioSheet.1Sheet.2Sheet.3Sheet.4AS067AS067AS067Solar PanelTouch KeySheet.9Sheet.10Sheet.11Sheet.12Sheet.13Sheet.14Sheet.15Sheet.16Sheet.17Non-Renesas Component.22Excitation CoilExcitation CoilExcitation CoilActive Filter, Gain Setting & Level ShiftingActive Filter, Gain Setting & Level ShiftingActive Filter, Gain Setting & Level ShiftingSheet.39Sheet.40Sheet.41Sheet.42Sheet.43Sheet.44Sheet.45Sheet.46Sheet.47Sheet.48Sheet.49Sheet.50Sheet.51Connector 1.158Flow Coil Driver BridgeFlow Coil Driver BridgeFlow Coil Driver Bridge-12V-12V-12V12V12V12VSheet.56Connector 1.158.57Sheet.58 2222Sheet.61Sheet.62ShuntSheet.64Sheet.67 Excitation CoilExcitation CoilExcitation CoilSheet.68Shunt.70Sheet.71Sheet.72Sheet.73Sheet.74Sheet.76Sheet.77Sheet.78Sheet.7912V12V12V3.3V3.3V3.3VSheet.82Sheet.83Sheet.86Sheet.87Sheet.88Sheet.89Sheet.90Connector 1.158.91Connector 1.158.92 4444Sheet.95 2 222Sheet.98 3.3V3.3V3.3V 3.3V3.3V3.3V 3.3V3.3V3.3VSheet.102 6Communication Lines B.795666CCCUser InterfaceUser InterfaceUser Interface 12V12V12VElectrode +Electrode +Electrode +Connector 1.158.110Electrode -Electrode -Electrode -Sheet.112RS-485RS-485 MODBUSRS-485 MODBUSMCUMCUMCUMCUPWMPWMPWMVDDVDDVDDLCDCLCDCLCDCUARTUARTUARTADCADCADCGPIOGPIOGPIOSPISPISPIDC/DC BuckDC/DC BuckDC/DC BuckBattery Charger ControlBattery Charger ControlBattery Charger ControlLead Acid BatteryLead Acid BatteryLead Acid BatteryNegative RegulatorNegative RegulatorNegative RegulatorDisplayDisplayDisplayRS-485/RS-422 TransceiversRS-485/RS-422 TransceiversRS-485/RS-422TransceiversData LoggerData LoggerData Logger

DC-DC Buck

Buck Regulators (Integrated FETs)

MCU

RA Arm Cortex-M MCUs

RS-485/RS-422 Transceivers

RS-485/422 with Enhanced ESD Protection

Active Filter, Gain Setting & Level Shifting

Precision Op Amps (Vos <1mV)

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