FQB2 Mass Flow Controller

Brand: Proportion-Air, Inc

The FQB2 Mass Flow Controller is another complete flow control package from Proportion-Air.

The FQB2 electronically modulates the pilot of any of a variety of mechanical flow amplifiers (Generally, the PSR-Series).

Proportion-Air selects the appropriate mechanical flow amplifier based on your specific application’s flow control parameters.

An F-series air flow transducer is used to feed an electronic signal representing the mass flow rate of air back to the FQB2 control valve circuit.

This makes a complete flow control package which electronically controls the flow of air independent of supply pressure or varying system restrictions.

The FQB2 mass flow controller has a standard turndown ratio of 10:1 – Ask about our 20:1 turndown ratio option.


Maximum Inlet Pressure

  • 150 psi (10.34 bar)


  • ± 4 % of Full Scale


  • ± 0.25 % of Full Scale

Lowest Control Flow

  • 3 - 30 scfm (85-850 LPM)

Port Size

  • 1/4” - 1-1/2” NPT (BSPP Available)


  • Immune to Shock & Vibration (up to 20 Gs)

Ambient Temperature

  • 32° to 158° F (0° to 70° C)

Media Temperatures

  • 32° to 122° F (0° to 50° C)

Turn-Down Ratio

  • 10:1


  • 40 micron

Power Requirement

  • 17-24 Vdc


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