MASS FLOW CONTROLLERS GFC
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MASS FLOW CONTROLLERS GFC - 1

MASS FLOW CONTROLLERS Model GFC thermal Mass Flow Controllers are designed to indicate and control set flow rates of gases. The GFC combines the characteristics and accuracy of conventional mass flow devices into a unique compact design at low costs previously unattainable. Each of these controllers incorporates an advanced straight tube sensor in conjunction with flow passage elements constructed of aluminum and brass for non-corrosive gases or 316 stainless steel for corrosive applications. Zero and span adjustments are accessible from the outside of transmitters. Principles of Operation Metered gases are divided into two laminar flow paths, one through the primary flow conduit, and the other through a capillary sensor tube. Both flow conduits are designed to ensure laminar flows and therefore the ratio of their flow rates is constant. Two precision temperature sensing windings on the sensor tube are heated, and when flow takes place, gas carries heat from the upstream to the downstream windings. The resultant temperature differential is proportional to the change in resistance of the sensor windings. Rigid metallic construction. Maximum pressure of 1000 psig (70 bars). Leak integrity 1 x 10-9 smL/sec of helium. NIST traceable certification. Built-in tiltable LCD readout. Local or remote setpoint control. 0-5 Vdc and 4-20 mA signals. Circuit protection. TIO Totalizer option. General Description Compact, self-contained GFC mass flow controllers are designed to indicate and control flow rates of gases. The rugged design coupled with instrumentation grade accuracy provides versatile and economical means of flow control. Aluminum or stainless steel models with readout options of either engineering units (standard) or 0 to 100 percent displays are available. The built-in electromagnetic valve allows the flow to be set to any desired flow rate within the range of the particular model. NIST Traceable Calibration A Wheatstone bridge design is used to monitor the temperature dependent resistance gradient on the sensor windings which is linearly proportional to the instantaneous rate of flow. Output signals of 0 to 5Vdc and 4 to 20mA are generated indicating mass molecular based flow rates of the metered gas. The combined gas streams flow through a proportionating electromagnetic valve with an appropriately selected orifice.The closed loop control circuit continuously monitors the mass flow output and maintains it at the set flow rate. Flow rates are unaffected by temperature and pressure variations within stated limitations. Typical Stainless Steel GFC Mass Flow Controller www.aalborg.com - e-mail ౧ info@aalborg.com - ( 845.770.3000 - fax 845.770.3010 - Toll Free in U.S.A. and Canada 1.800.866.3837 30

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MASS FLOW CONTROLLERS GFC - 2

MASS FLOW CONTROLLERS Setpoints are controlled either locally or remotely. The valve is normally closed as a safety feature to ensure that gas flow is shut off in case of a power outage. The LCD readout built into the top of the transducer is tiltable over 90 degrees to provide optimal reading comfort. It is connected to the transducer by a standard modular plug, and is readily removable for remote reading installations. Transducers without LCD readout are offered for OEM applications. GFC mass flow controllers are available with flow ranges from 10 mL/min to 1000 L/min N2.Gases are...

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MASS FLOW CONTROLLERS GFC - 3

MASS FLOW CONTROLLERS TABLE 16 - FLOW RANGES FOR GFC GFC 17 LOW FLOW MASS FLOW CONTROLLER CODE GFC 37 MEDIUM FLOW MASS FLOW CONTROLLER 11 GFC 47 /57 /67 /77 HIGH FLOW MASS FLOW CONTROLLER 40 GFC 57, 67 and 77 Series Aluminum and Stainless Mass Flow Controllers TABLE 18 - ACCESSORIES FOR GFC POWER SUPPLY - BATTERY PACK - CABLES TABLE 17 - MAXIMUM PRESSURE DROP FOR GFC MODEL FLOW RATE [liters/min] MAXIMUM PRESSURE DROP Power Supply, 110 V/12 Vdc /North America Power Supply, 110 V/24 Vdc /North America Power Supply, 220 V/12 Vdc /Europe Power Supply, 220 V/24 Vdc /Europe Power Supply 240 V/12...

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MASS FLOW CONTROLLERS GFC - 4

MASS FLOW CONTROLLERS DASHED LINE FOR HIGH FLOW UNITS GFC Mass Flow Controller TABLE 19 - DIMENSION FOR GFC DIMENSION (INCH) MODEL CONNECTION COMPRESSION FITTING (except model GFC 77) MOUNTING HOLE 33 www.aalborg.com - e-mail ౧ info@aalborg.com - ( 845.770.3000 - fax 845.770.3010 - Toll Free in U.S.A. and Canada 1.800.866.3837

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MASS FLOW CONTROLLERS GFC - 5

ORDERING INFORMATION MASS FLOW CONTROLLERS MODEL MAX. FLOW (N2) 17 10 L/min 37 50 L/min 100 L/min 47 57 200 L/min 67 500 L/min 77 1000 L/min MATERIAL A Aluminum S Stainless Steel Viton® Buna® EPR PTFE/ Kalrez® FITTINGS A 1/4" Compression B 1/8" Compression C 1/4" VCR® D 3/8" Compression E 1/2" Compression F 3/4" FNPT G 3/4" Compression H 6mm Compression DISPLAY N No display L LCD readout POWER 6 Universal +12 Vdc to 26 Vdc 2 12 Vdc 4 24 Vdc INPUT/OUTPUT SIGNAL A Local 0-5 Vdc B Local 4-20 mA C 0-5Vdc/0-5Vdc D 0-5Vdc/4-20mA E 4-20mA/4-20mA F 4-20mA/0-5Vdc DIGITAL INTERFACE None 0 EXAMPLE:...

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