The electromagnetic flow meter block diagram depicts the main components of an electromagnetic flow meter. It includes the flow tube that houses the electrodes and field coil in contact with the moving fluid, the coil excitation system that produces the magnetic field, the signal conditioning unit that converts the electrode signals, the processing unit that generates control signals and provides readings, the IO interface that communicates with external devices, the user interface for manual operation, and the power supply unit that provides constant energy.

1. Electromagnetic Flow Meter Block
Diagram
The following diagram depicts the architecture of the electromagnetic
flow meter.
The flow tube
The flow tube houses the terminals in direct contact with the moving
conductive fluid and field coil. The electrode contained here is an
essential element as it picks up the voltage in the fluid. Electrode
elements have different options that feature different corrosion rates,
temperature drift, and potential terminal characteristics like SS and

2. titanium. However, this selection greatly relies on the durability and type
of fluid being measured.
Coil excitation system
This unit produces an electrical current that cuts the field wires according
to the processing unit’s charge signal to produce the controlled magnetic
field.
Signal conditioning unit
The unit changes the flow tubing terminal output to a notable measurable
signal to measure the flow.
Processing unit
The processing unit is the center of the electromagnetic current meter.
This unit generates the control signal for loop excitation. Moreover, the
unit gives the final reading of currents to user interfaces and IO by
working on the conditioning unit’s signal unit with different
mathematical and statistical formulas.
IO interface
The interface gives support for the flow of information to the current
outer device. In communicating with external devices, the interfaces
utilize the various output formats like voltage output, pulse output,

3. RS485/RS232 serial communication, and relay output. A flow meter also
supports the interfacing of transistors or sensors, and external transmitters
as a valued added option.
User interface
A user interface such as keypads, LEDs, and LCDs offers an easy manual
operation editing, setting the flow meter arrangement at the field.
Power supply unit
The power supply unit offers a constant supply of energy by determining
the quality of the measurements. Either a battery or an AC source powers
the magmeter. For a long battery life for Magmeters, it is necessary to use
a component selection and smart power management.
Mr. Michael Sun
Sales Manager
Dalian Zero Instrument Technology Co., Ltd China
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