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Pulse or Current Output Low Flow Electromagnetic Flow Meter

Electromagnetic Low Flow Meter


Item# FMG71B-A

In stock

Lead Time (If not in stock): 6 weeks
Electromagnetic Low Flow Meter FMG71B-A FMG71B-A
  • No Moving Parts
  • No Flow Obstructions
  • Maintenance-Free
  • Fast Response Time (< 500 ms)

FMG71B-A Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Flow Range
Output Signal
Process Connection Type
Process Connection Size
Max Operating Pressure
Max Process Temperature
Wetted Materials
Media Type
Supply Power

  • Accuracy Value ±1.5% of reading ±0.3% range
  • Flow indication LED green
  • Housing Material Cast Aluminum
  • Maximum Conductivity 20 mA
  • Maximum Liquid Temperature 90°C (194°F)
  • Maximum Operating Pressure 16 bar (232 psi)
  • Maximum Signal Current 20 mA
  • Response Time <500 mS
  • Supply Voltage 24 Vdc ±10%
The FMG70B Series from OMEGA is a trio of extremely compact, low cost, inductive magnetic flow sensors. This product line allows a unique and highly reliable measuring technique to be introduced into areas of process control previously considered not possible.

Changes of temperature, density, viscosity, concentration or electrical conductivity (minimum conductivity of 50 µs/cm) of the fluid do not affect the output signal.

FMG70B series can be used in areas where flow sensors with moving parts e. g. paddle wheel sensors, cannot be applied due to contamination/particulate in the media. The sensor is intended for continuously measuring of flow rates or for dosing/batching of electrically conductive liquids (minimum conductivity 50 S/cm). The output signal frequency (or current) is proportional to the flow. Two options are available for output signals, frequency or analog (-A models).

Materials of Construction
Electrodes and Process Connection: Stainless steel 316 TI
Measuring Pipe: PEEK-GF30
Gasket: EPDM
Housing: Cast Aluminum
Accuracy: ±1.5% of reading ±0.3% range
Repeatability: 1%
Minimum Conductivity: 50 µs/cm
Maximum Liquid Temperature: 90°C (194°F)
Ambient Temperature: 5 to 70°C (41 to 158°F)
Maximum Pressure: 16 bar (232 psi)
Flow Indication: LED green, flow proportional blinking
Frequency: Square wave signal NPN, internal pull-up resistor 2 k? pulse duty ratio 50:50
Signal Current Maximum: 20 mA, current limited
Response Time: <500 mS
Electrical Connection: Plug connector M12 x 1
Power Supply: 24 Vdc ±10%
Current Consumption: Maximum 150 mA
Electrical Protection: Measures short-circuit proof (up to 30V) and polarity protection (up to -30V)
Protection Class: NEMA 4X (IP65)
Flow Range:
    FMG71B: 0.5 to 30 LPM (0.13 to 7.93 GPM)
    FMG72B: 1 to 60 LPM (0.26 to 15.85 GPM)
    FMG73B: 5 to 250 LPM (1.32 to 66 GPM)
Analog Output Signal (“-A” Models) 4 to 20 mA (0 to Full Scale):
    Current Limitation: 26 mA approx.
    Maximum Load: 250 ? to GND
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Is there a 4-20mA version of the FMG71B available? The datasheet says there is but the website shows no such thing.

Asked by: TMRW
Ordering with part number FMG71B-A results in &quot;Part not found&quot;.
Answered by: TMRW
Date published: 2019-10-09

Is the 4-20mA version (FMG71B-A) a 2-wire or 3-wire? The data sheet, the manual and the pinout diagram on the part do not make this distinction clear.

Asked by: Space Ball
Than kyou for your inquiry. Please email the Flow Group at and will send the information regarding the correct PINS.
Answered by: Applications Engineer JJC
Date published: 2024-06-18
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