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Low Cost Plastic Low Flow Turbine Meter



Item# FTB-421

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $122.83
5-9 $116.69
10-24 $114.23
25-49 $109.32
50-99 $106.86
100+ $104.41

In stock

Lead Time (If not in stock): 7 Days
  • Discontinued. Replaced by BV1000TRN025A
  • Low Flow Rates 0.1 to 2.5 LPM
  • High Accuracy ±3% of Reading
  • Lightweight Turbine Ensures Fast Startup
  • Mounts in Any Orientation

FTB-421 Model Options

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

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

  • Accuracy Value ±3% of reading
  • Current Output 10µA (3 to 30K pull up resistor required)Accuracy: ±3% of reading
  • electrical Connection 9.4 mm spacing 3-pole DIN connector (1" high)
  • Maximum Operating Pressure 24 bar (350 psi)
  • Maximum Ambient Temperature 100°C (212°F)
  • Output Signal 36.6 to 917 Hz
  • Minimum Ambient Temperature -20°C (-4°F)
  • Supply Voltage 5 to 24 Vdc
  • Retransmission/Analog Output NPN sinking open collector @ 20 mA maximum leakage
OMEGA’s FTB-420 Series features proven turbine technology in a small package for low flow applications. The turbine technology provides a highly repeatable sensor ideally suited for measurement of either volume dispensing and/or flow rate applications. The small turbine reacts quickly to on/off dispensing applications. Each sensor is 100% tested, ensuring long service life.

Specificat ions
Wetted Materials:
    Body: Nylon 12
    Turbine: Nylon 12 composite
    Bearings: PTFE/15% graphite
Operating Pressure: 24 bar (350 psi)
Burst Pressure: 97 bar (1400 psi)
Flow Range: 0.026 to 0.65 GPM (0.1 to 2.5 LPM)
Pulses: 83,200 per gallon (22,000 per liter)
Frequency Output: 36.6 to 917 Hz
Operating Temperature: -20 to 100°C (-4 to 212°F)
Viscosity: 32 to 70 SSU (0.8 to 16 centistokes)
Filter: <50 Microns
Input Power: 5 to 24 Vdc
Output (Hz): NPN sinking open collector @ 20 mA maximum leakage
Current: 10µA (3 to 30K pull up resistor required)
Accuracy: ±3% of reading
Repeatability: 0.5% of full scale
Electrical Connection: 9.4 mm spacing 3-pole DIN connector (1" high)
Inlet/Outlet Ports: ¼ NPT or ¼ G male
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Rated 4 out of 5 by from 2 out of 3 worked fine I bought 3 of these and 1 failed after about 30 minutes. I did receive a replacement, but still waiting to get reimbursed for the bad one.
Date published: 2017-06-16
Rated 1 out of 5 by from Quality is not suitable for engines. Cheap plastic We used this in a diesel engine fuel flow application and the connectors were sheared off as soon it was installed. The plastic is weak and cannot be used in a normal fuel line. We tried 3 and they all broke. We tried to get service to refund or find a way to help us but although we got an initial response there was no follow up and we had no resolution. We ended up getting a flow meter from an aviation company. The metal components were much better and have been working very well. This was expensive trial and error. An unfortunate disappoint experience for us.
Date published: 2021-01-06
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