F-Series Mass Flow Transducer

F-Series Mass Flow Transducer

The F-Series Mass Flow Transducer is a fast response flow monitor. It uses a differential pressure measurement of air flowing across an internal venturi. The analog electronic circuit converts the differential pressure to an electronic output that is linear to the mass flow rate of air passing through the venturi.

  • Fast response flow measurement thanks to the combination of differential pressure with analog electronics.
  • Couple to a variety of Proportion-Air electronic flow control valves to make a complete factory calibrated flow control package.

The F-Series is available in multiple port sizes (1/4″ to 1-1/2″) and 3 distinct models: FR, FP and FA – more information on each model below.

Accuracy ±
Repeatability ±
Max Flow (SCFM)
Max P1 (PSI)
  • Technical Specs
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Technical Specs

Max Inlet Pressure150 PSI (10.34 Bar)
Accuracy±4% F.S.
Repeatability±0.25% F.S.
Lowest Measured Flow Ranges2 to 20 SCFH (0.94-9.4 LPM)
Port Size1/4″ to 1-1/2″ NPT (BSPP Available)
DurabilityImmune to shock & vibration (up to 20 Gs)
Ambient Temps32-158°F (0-70°C)
Media Temps32-122°F (0-50°C)
Turn-Down Ratio10:1 (inquire about 20:1)
Filtration40 Micron
Highest Measured Flow Ranges25 to 250 SCFM (708-7080 LPM)
Compatible MediaAir, Carbon Dioxide (CO2), Argon (Ar), Helium, Nitrous Oxide (N2O)*, Oxygen*, Nitrogen (N2) (*consult factory)

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Three Flow Transducer Models

with subtle differences and important implications


FR Model | This F-series mass flow transducer is a pressure regulated flow monitor that provides flow measurement in real-time – less than 10ms. This model requires a known and fixed regulated supply pressure to maintain its calibration. By regulating the input pressure, the incoming density of the gas is known and the FR model output is calibrated for that density.
*Requires a known and regulated inlet pressure


FP Model | This F-series flow monitor has a 2nd transducer that measures the absolute pressure of the incoming gas. This allows the unit to compensate for changes in gas density due to changes in pressure. The FP model can compensate from 50% to 100% of the maximum calibrated absolute supply pressure, as called out in the part number.
*Need to know the max potential inlet pressure


FA Model | This F-series flow monitor must have its output port open to atmosphere to work properly. It is calibrated for the density of gas at atmosphere. The FA model is most commonly used to meter out gas in cylinder speed control applications. The FA model must be paired with an FQPV, FQB3 or FQB2 to control cylinder speed.
*Designed for cylinder speed control