FQPV2 Mass Flow Controller

FQPV2 Mass Flow Controller

The FQPV2 mass flow controller uses a super fast analog PID to drive an electric current to a true proportional solenoid valve in order to vary the media flow rate. The mass flow of the media is quickly detected by the F-series mass flow transducer and the electric signal is provided to the PID control circuit. This high speed mass flow controller is a complete package consisting of a proportional flow control solenoid valve, mass flow transducer, and high speed PID control circuit to close the loop. All you need to provide is source air pressure, power and an electronic control signal.

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

Max Inlet Pressure150 PSI (10.34 Bar)
Accuracy±4% F.S.
Repeatability±0.25% F.S.
Lowest Control Flow4 to 40 SCFH (1.89-18.9 LPM)
Port Size1/8″ 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
Power Requirement17-24 VDC

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FQPV2 Mass Flow Controller

The FQPV2 electronic mass flow controller is able to control gas flow rates as low as 2 SCFH to as high as 1 SCFM with a 10:1 turn-down ratio. For flow rates below one standard cubic foot per minute (scfm), an F-series flow transducer is used as electronic feedback to an FQPV2 control valve.

The FQPV2 has an internal analog PID (proportional, integral & derivative) control circuit which matches the user provided electronic command signal to the electronic flow rate feedback signal from the F-series mass flow transducer. The circuit achieves this by modulating the drive current to a linearly-variable proportional solenoid valve inside the FQPV2 mass flow controller. Because direct proportional solenoid control is limited to low flow rates, this complete flow control package is limited to 1 scfm. However, direct control with a proportional solenoid does allow for extremely high resolution flow control.

Three Flow Control Models

with subtle differences and important implications


FR | Requires a known and fixed regulated supply pressure to maintain calibration


FP | Compensates for fluctuations in inlet pressure (up to 50%) to maintain calibration


FA | Requires output port open to atmosphere. Most commonly used in cylinder speed control