Page 1
ElEctromagnEtic low
Flow mEtEr
FMG70B Series
U No Moving Parts
U No Flow Obstructions
U Maintenance-Free
U Fast Response Time
(< 500 ms)
U Minimal Straight Pipe
Requirements
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).
SPECIFICATIONS
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
FMG71B shown with
DPF701
meter/totalizer. Visit
OMEGA to order.
1
DIN 6-digit rate
⁄
8
FMG71B shown actual size.
Maximum Liquid Temperature:
90ºC (194°F)
Ambient Temperature: 5 to 70ºC
(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 kΩ 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 Ω to GND
H
H-XX
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Dimensions, Pressure drop Series FMG
10. Dimensions, Pressure drop
14
(0.55)
M12x1
124 (5.04)
~ 80 (3.15)
~ 65 (2.56)
36 (1.42)
12 (0.47)
Light emitting diode
plug M12x1
FMG73B
~ 65 (2.56)
36 (1.14)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Pressure drop ∆p (psi)
0 2 4 6 8 10 12
Flow rate (US gal/min)
FMG72
FMG71
Ø 20 (0.79)
~ 75 (2.95)
35.5
(1.40)
26
(1.02)
~ 75 (2.95)
33
(1.30)
Ø 7 (0.16)
Ø 10 (0.39)
½ NPT/BSP
¾ NPT/BSP
Dimensions, Pressure drop Series FMG
10. Dimensions, Pressure drop
FMG71B
FMG72B
14
(0.55)
M12x1
124 (5.04)
~ 80 (3.15)
~ 65 (2.56)
36 (1.42)
12 (0.47)
Light emitting diode
plug M12x1
nut size 27 (1.063)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Pressure drop ∆p (psi)
0 2 4 6 8 10 12
Flow rate (US gal/min)
FMG72
FMG71
26
(1.02)
~ 75 (2.95)
33
(1.30)
Ø 7 (0.16)
Ø 10 (0.39)
FMG71B
½ NPT/BSP
FMG72B
¾ NPT/BSP
~ 65 (2.56)
36 (1.42)
~ 75 (2.95)
33
(1.30)
Ø 7 (0.16)
Ø 10 (0.39)
Dimensions, Pressure drop Series FMG
10. Dimensions, Pressure drop
FMG71B
14
M12x1
124 (5.04)
~ 80 (3.15)
~ 65 (2.56)
36 (1.42)
~ 65 (2.56)
36 (1.42)
~ 65 (2.56)
36 (1.14)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Pressure drop ∆p (psi)
0 2 4 6 8 10 12
Flow rate (US gal/min)
FMG72
FMG71
Ø 20 (0.79)
~ 75 (2.95)
35.5
(1.40)
~ 75 (2.95)
33
(1.30)
Ø 7 (0.16)
Ø 10 (0.39)
Dimensions, Pressure drop Series FMG
10. Dimensions, Pressure drop
FMG71B
FMG72B
14
(0.55)
M12x1
124 (5.04)
~ 80 (3.15)
~ 65 (2.56)
36 (1.42)
12 (0.47)
Light emitting diode
plug M12x1
nut size 27 (1.063)
FMG73B
16 (0.55)
140 (6.10)
~ 80 (3.15)
M12x1
~ 65 (2.56)
36 (1.14)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Pressure drop ∆p (psi)
0 2 4 6 8 10 12
Flow rate (US gal/min)
Flow rate (US gal/min)
0 10 20 30 40 50 60
Pressure drop ∆p (psi)
2.0
1.5
1.0
0.5
0.0
FMG72
FMG71
FMG73
®
Ø 20 (0.79)
~ 75 (2.95)
35.5
(1.40)
26
(1.02)
~ 75 (2.95)
33
(1.30)
Ø 7 (0.16)
Ø 10 (0.39)
FMG71B
½ NPT/BSP
FMG72B
¾ NPT/BSP
Dimensions, Pressure drop Series FMG
10. Dimensions, Pressure drop
14
(0.55)
M12x1
124 (5.04)
~ 80 (3.15)
~ 65 (2.56)
36 (1.42)
12 (0.47)
Light emitting diode
plug M12x1
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Pressure drop ∆p (psi)
0 2 4 6 8 10 12
Flow rate (US gal/min)
FMG72
FMG71
26
(1.02)
~ 75 (2.95)
33
(1.30)
Ø 7 (0.16)
Ø 10 (0.39)
½ NPT/BSP
¾ NPT/BSP
~ 65 (2.56)
36 (1.42)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Pressure drop ∆p (psi)
0 2 4 6 8 10 12
Flow rate (US gal/min)
FMG72
FMG71
~ 75 (2.95)
33
(1.30)
Ø 7 (0.16)
Ø 10 (0.39)
0.13 to 7.93 GPM
0.26 to 15.85 GPM
1.32 to 66 GPM
FMG72B
Dimensions: mm (inch)
Ø = diameter
6.0
5.0
4.0
3.0
2.0
1.0
Pressure drop ∆p (psi)
0.0
0 2 4 6 8 10 12
Ø 10 (0.39)
~ 75 (2.95)
33
(1.30)
Ø 7 (0.16)
~ 65 (2.56)
36 (1.42)
FMG71
Flow rate (US gal/min)
FMG72
FMG73B
18
(0.71)
29
(1.15)
1 NPT/BSP
Nut size 34 (1.338)
16 (0.55)
~ 75 (2.95)
35.5
(1.40)
Ø 20 (0.79)
plug M12x1
Light emitting diode
140 (6.10)
~ 80 (3.15)
M12x1
~ 65 (2.56)
36 (1.14)
To Order
Model No. Model No. Output NPT/BSP Sensor I.D.
FMG71B FMG71B-BSP
®
FMG72B FMG72B-BSP
FMG73B FMG73B-BSP
FMG71B-A FMG71B-A-BSP
FMG72B-A FMG72B-A-BSP
FMG73B-A FMG73B-A-BSP
Comes complete with operator’s manual.
Ordering Examples: FMG72B flow senor with frequency output, DPF701 digital panel meter,
and M12C-PVC-4-R-F-5, 5 m (16.4') cable. Visit OMEGA to order panel meter.
FMG71B-A flow sensor with analog output, DPF64 digital rate meter, and
M12C-PVC-4-R-F-5, 5 m (16.4') meter cable. Visit OMEGA to order rate meter.
Accessories
Model No. Description
M12C-PVC-4-R-F-5
M12C-PVC-4-R-F-10
PSU-93
H-XX
5 m (16.4') cable with right angle M12 x stripped leads
10 m (32.8') cable with right angle M12 x stripped leads
Unregulated power supply
2.0
1.5
1.0
0.5
Pressure drop ∆p (psi)
0.0
0 10 20 30 40 50 60
NPN frequency
3785 pulses/gal
Flow rate (US gal/min)
NPN frequency
1893 pulses/gal
NPN frequency
757 pulses/gal
4 to 20 mA,
4 to 20 mA,
4 to 20 mA,
FMG73
1
⁄2
1
⁄2
1
1
⁄2
1
⁄2
1
1
⁄4
3
⁄8
3
⁄4
1
⁄4
3
⁄8
3
⁄4
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