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FQB3 Mass Flow Controller

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The FQB3 is an electronic mass flow controller that incorporates an integral mechanical flow amplifier to produce flow rates up to 30 SCFM. From the factory, the FQB3 mass flow controller is married to an F-series high speed mass flow transducer. A set-point command to the FQB3 controller causes the electronic flow control circuit to open the mechanical flow amplifier until the mass flow rate of air detected by the F-series flow transducer matches the electronic set-point. The loop is always closed around the flow of air independent of the required pressures.

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FQB3 Downloads & Links
FQB3 Technical Specifications
Max Inlet Pressure Accuracy Repeatability MIN/MAX Flow Range
150 PSI (10.34 Bar) ±4% F.S. ±0.25% F.S. 1 to 10 SCFM /3 to 30 SCFM 
Port Size Durability Ambient Temps Media Temps
1/4″ NPT (BSPP Available) Immune to shock & vibration (up to 20 Gs) 32-158°F (0-70°C) 32-122°F (0-50°C)
Turn-Down Ratio Filtration Power Requirement
10:1 (inquire about 20:1) 40 Micron 17-24 VDC
FQB3 Mass Flow Controller

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The FQB3 mass flow controller is a compressed gas flow control assembly. The assembly consists of an FQB3-Series proportional control valve and an F-Series high speed flow monitor. The FQB3 mass flow valve consists of two normally closed solenoid valves, an integrated volume booster, a control circuit board and a protective canister.

The FQB3 operates by comparing the user’s electronic command input signal to the signal being returned to the FQB3 from the F-Series flow monitor. The on-board control circuit examines any differences between these signals and actuates the solenoid valves in response. Opening one solenoid valve removes compressed gas while opening the other solenoid valve adds compressed gas from the supply. The FQB3 continuously monitors the user command and F-Series feedback signals to keep the assemblies flow rate at the desired point.

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with subtle differences and important implications

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PRESSURE REGULATED

Requires a known and fixed regulated supply pressure to maintain calibration

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PRESSURE COMPENSATED

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

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ATMOSPHERIC

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

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