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.
Materials of Construction
Electrodes and Process Connection: Stainless steel 316 TI
Measuring Pipe: PEEK-GF30
Housing: Cast Aluminum
Accuracy: ±1.5% of reading ±0.3% range
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 kOhm 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)
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 Ohm to GND
Complete informations can be found in the spec sheet (PDF), see the "Download" section.
A thermal mass flow meter measures the flow rate of gas mass based on the convective heat transfer of a heated surface to the flowing fluid. The components of a basic thermal mass flow meter include two temperature sensors with an electric heater between them. The heater can protrude into the fluid stream or can be external to the pipe.
In the past, mass flow was often calculated from the outputs of a volumetric flow meter and a densitometer. Density was either directly measured, or was calculated using the outputs of process temperature and pressure transmitters...
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