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304SS Liquid Turbine Flow Meter, 4 to 20mA Output

3-1/2" Turbine Flow Meter, 304SS, 4-20mA, 440 GPM
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Item# FTB-870-I

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Lead Time (If not in stock): 4 weeks
3-1/2" Turbine Flow Meter, 304SS, 4-20mA, 440 GPM FTB-870-I FTB-870-I
  • The sensor is of hard alloy bearing thrust type, which may guarantee the precision and improve the wear resistance performance as well.
  • Simple and firm structure easy for installation and dismantling.
  • Wide range of measuring with very low lower flow velocity limit.
  • Small loss of pressure fine repeat ability and high precision.
  • High resistance to electromagnetic interference and vibration.

FTB-870-I Model Options

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

  • Accuracy Value ±0.5%
  • Current Output 4 to 20 mA
  • Electrical Connection 2 m (6.6') cable length
  • Maximum Ambient Humidity 90% RH
  • Maximum Ambient Temperature 60°C (140°F)
  • Minimum Ambient Humidity 5% RH
  • Minimum Ambient Temperature -20°C (-4°F)
  • Supply Voltage 12 to 24 Vdc

The FTB-800 Series is a low cost Liquid Turbine Flow Meter with a 4-20 mA output available in 12 sizes covering flow ranges between 0.176 to 880 GPM. The FTB-800 Series Turbine Flow Meters are designed to meet the demands of the most rigorous flow measurement applications. The meter features a 304 stainless steel housing and rotor support, CD4MCU stainless steel rotor, and abrasion-resistant tungsten carbide rotor shaft and 316SS bearings. These materials help the meter to maintain accuracy and mechanical integrity when measuring the corrosive and abrasive fluids found in many industries.

When liquid flows through the casing of the sensor, the impulse of fluid will provide the blade with a rotation moment as there is an angle between the blade of the impeller and the flow direction. The blade will rotate as the friction moment and the fluid resistance are overcome, and it will reach a stable speed when the moments are at balance. Under certain conditions, the rotation speed of the blade will be in direct proportion to the flow velocity. Due to the magnetic conductivity of the blade, when located in the magnetic field generated by the signal detector (made of permanent magnet steel and coils), the rotating blade will cut the magnetic lines and periodically change the flux through the coil, thereby inducing electrical impulse signals at both ends of the coil. The induced signals, after being amplified and rectified will form a continuous rectangular impulse wave with certain amplitude which may be remotely transmitted to a display instrument indicating the instant flow and the cumulative flow of fluid. Within a certain range of flow, the impulse frequency f is in direct proportion to the instant flow of fluid flowing through the sensor.

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I got one FTB-815-I turbine meter 1", Could I conected in 1/2" size? Do you have a stainless steel 1/2" connector aditional accessory?

Asked by: Miguel Monasterio
Thank you for your inquiry about the turbine flow meter. Unfortunately, there is no reducer available and in the event you must reduce the pipe diameter that much, please follow the straight run requirement upstream of at least 10x the diameter and 5x the diameter downstream.
Answered by: JC ENGR
Date published: 2021-03-15

How do I measure the 4-20mA output signal and transport it to my DAQ device?

Asked by: JohnZZ
Thank you for your inquiry about the turbine flow meter. Most DAQ systems can take a process analog input and if yours does not, then, best to contact our Data Acquisition Group at das@omega.com and they may have a module that will connect to your DAQ device.
Answered by: Application Engineer JC
Date published: 2021-10-25

How to convert the 4-20 mA to flow rates? Is there a linear correlation between these two parameters?

Asked by: JohnZZ
Thank you for your inquiry about the turbine flow meter. Omega suggests that at 4 mA equals to ZERO flow and at 20 mA equals to the maximum flow rate and is linear between these points.
Answered by: Application Engineer JC
Date published: 2021-10-28
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