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Measured variables
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Directly measured variables: flow rate, temperature, pressure
Calculated value of measured variable: volumetric flow rate
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Nominal diameter
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DN6~DN65
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Accuracy
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Flow rate: ±0.5%;Temperature: ±0.5℃;Pressure: ±8kPa
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Repeatability
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±0.16%
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Transmitter output
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(4~20) mA output, load resistance ≤500Ω
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Communication output
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RS485 interface, MODBUS-RTU; IO-Link
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Pulse output
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Pulse equivalent, pulse width adjustable from 1ms to 1000ms
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Power supply
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(18~36) VDC
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Power consumption
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<5W
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Electrical interface
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M12-4 pin connector
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Medium temperature
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Standard type: (-40~90)℃；High temperature type: (-40~125)℃
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Process pressure
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(-0.1 ~ 4.0) MPa (without pressure sensor)；
(0 ~ 1.6) MPa (with pressure sensor)
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Electrical conductivity
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≥2 μS / cm
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Ambient temperature
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(-25 ~ 75) ℃
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Storage temperature
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(-40~ 80) ℃
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Relative humidity
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5%~90%
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Protection level
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IP67
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The FMX300 compact electromagnetic flowmeter combines the sensor and converter of a traditional mag meter in a single all-in-one body, saving installation space and simplifying commissioning. Its small footprint and flexible installation make it suitable for a wide range of applications. Operation is performed via an infrared remote control, and the instrument features a high-definition display with user-friendly bilingual (Chinese/English) menus for quick, intuitive use.
With simple installation and commissioning, the FMX300 is widely used across industries for measuring the volumetric flow of conductive liquids with a conductivity greater than 1.0 μS/cm. As an inductive-type instrument, it offers precise volumetric flow measurement for conductive media. Powered by an ARM Cortex-M4 32-bit processor and a 24-bit ADC acquisition system, it delivers fast computation and high accuracy. Built-in self-diagnostic functions include empty-pipe detection, excitation failure detection and flow alarms. Its patented excitation technology ensures stable performance, while the imported PEEK lining with electrodes and lining formed in a single injection-molding process guarantees consistent quality and reliability.
• Unaffected by changes in fluid density, viscosity, temperature, pressure or conductivity.
• In-line design with no moving or obstructive parts in the measuring tube – zero pressure loss and minimal straight-pipe requirements; excellent adaptability for slurry measurement.
• One-piece electrode and lining construction for superior stability and reliability.
• Ultra-low EMI power supply with wide voltage tolerance and excellent electromagnetic immunity.
• ARM Cortex-M4 32-bit processor with 24-bit ADC for high-speed, high-accuracy performance; low-frequency square-wave excitation with programmable frequency settings enhances stability and reduces power consumption.
• Uses SMD components and SMT technology for high circuit reliability.
• Flow range can be reconfigured on site to meet user requirements.
• High-definition OLED display with bilingual menus for straightforward operation and quick learning.
• Self-check and self-diagnostic capabilities.
• Three internal totalizers for forward flow, reverse flow and net total flow.
• PEEK-lined sensor capable of operating under negative pressure.
• Infrared handheld controller with 38 kHz communication rate for long-distance, non-contact operation.
• Flow output via 4–20 mA and RS-485 (MODBUS-RTU) communication.
• Temperature output via 4–20 mA and RS-485 (MODBUS-RTU) communication.
The FMX300 electromagnetic flowmeter (also called a magmeter) operates on Faraday's law of electromagnetic induction. Two electromagnetic coils at the upper and lower ends generate a constant or alternating magnetic field. When the conductive medium flows through the magmeter, an induced electromotive force (E) is detected between the left and right electrodes on the flow tube wall.
The magnitude of the induced electromotive force (voltage) is proportional to the velocity (V) of the conductive flow, the density of the magnetic field (B), and the electrode spacing (D). The volumetric flow can be determined by calculation:
E = K × B × V × D
Where: E – Induced electromotive force; K – Meter tube constant; B – Magnetic flux density; V – Average flow velocity; D – Electrode spacing.
When measuring volumetric flow, conductive flow passes through a magnetic field perpendicular to the flow direction. The induced voltage signal is detected by two electrodes and transmitted to the converter. After a series of analog and digital signal processing, the totalized flow and instantaneous flow are displayed on the converter's screen.
• Data center cooling: cooling water and liquid cooling loop flow monitoring (chiller circuits, coolant distribution systems)
• HVAC and process water systems
• Chemical dosing, water treatment and conductive liquid measurement
• Slurry and pulp measurement (no moving parts, PEEK-lined, zero pressure loss)
• Food, beverage and pharmaceutical utility water
• General industrial process automation
Q：What is the minimum electrical conductivity of the measured medium?
The FMX300 measures the volumetric flow of conductive liquids with an electrical conductivity of ≥2 μS/cm (specification table). The datasheet introduction also describes the meter as suitable for conductive liquids with a conductivity greater than 1.0 μS/cm.
Q：What nominal diameters are available?
DN6, DN10, DN15, DN20, DN25, DN32, DN40, DN50 and DN65 – covering flow ranges from 0.03 m³/h to 30 m³/h.
Q：What outputs and communication protocols does the FMX300 support?
A (4~20) mA transmitter output (load resistance ≤500 Ω), pulse output (pulse width adjustable from 1 ms to 1000 ms), RS485 (MODBUS-RTU), and IO-Link. The M12-4 pin connector's pins 2 and 4 are freely configurable via the menu for analog flow/temperature/pressure signals, frequency, pulse, or digital inputs/outputs; in IO-Link mode pin 4 is the communication port.
Q：Can the FMX300 measure slurry or media containing solids?
Yes. The in-line design has no moving or obstructive parts in the measuring tube, which results in zero pressure loss, minimal straight-pipe requirements, and excellent adaptability for slurry measurement.
Q：Can the sensor handle negative pressure?
Yes. The PEEK-lined sensor is capable of operating under negative pressure. Process pressure range: (-0.1~4.0) MPa without a pressure sensor; (0~1.6) MPa with a pressure sensor.
Q：What temperature and environmental ranges are supported?
Medium temperature: standard type (-40~90) ℃, high temperature type (-40~125) ℃. Ambient temperature (-25~75) ℃, storage temperature (-40~80) ℃, relative humidity 5%~90%, protection level IP67.
Q：How accurate is the flow measurement?
Flow rate accuracy ±0.5%, temperature accuracy ±0.5 ℃, pressure accuracy ±8 kPa, with repeatability ±0.16%.
Q：Is the FMX300 suitable for data center cooling water monitoring?
Yes. As an all-in-one compact electromagnetic flowmeter with IP67 protection, (18~36) VDC wide-tolerance power supply, and 4–20 mA / RS-485 (MODBUS-RTU) / IO-Link outputs, it integrates easily into data center cooling loops, chiller circuits and BMS/SCADA systems for continuous conductive-liquid flow monitoring.
