• Aalborg Instruments

GFC Mass Flow Controllers

Each compact, self-contained GFC Mass Flow Controller 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 conveniently accessible from the outside of the transmitter.

Aalborg®'s rugged GFC Mass Flow Controller design, coupled with instrumentation 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.

Benefits:

• Rigid metallic construction.
• Maximum pressure of 1000 psig (70 bars).
• Leak integrity 1 x 10 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.
• Totalizer option.

FLOW MEDIA: Mass Flow Controllers will not operate with liquids. Only clean gases are allowed to enter into transmitters. Contaminated gases must be filtered to prevent the introduction of impediments into the sensor.

FLOW RANGES: Eighteen conveniently overlapping flow ranges from 10 sml/min to 100sL/min (in terms of Nitrogen flow) are offered. Visit website to see table of flow ranges.

SENSOR TUBES: Straight capillary Sensor Tubes are made of type 316 stainless steel. The large ratio of length to inside diameter ensures laminar gas flow within the Sensor Tubes. Two precision windings heating the outside of the thin walled tubing serve as temperature sensing devices.

RESTRICTOR FLOW ELEMENTS: Restrictor Flow Elements (RFE), also known as flow splitters, serve to smooth the main stream of gas into laminar flow and split a small, fixed proportion of gas into the thermal Sensor Tube.

MATERIALS IN GAS CONTACT: a. Aluminum models GFC17, 37 and 47: anodized aluminum, 316 stainless steel, brass, and Viton® O-rings. b. Stainless Steel models GFC17S, 37S and 47S: 316 stainless steel and Viton® O-rings.

CIRCUIT PROTECTION: Circuit boards have built-in polarity reversal protection. Resettable fuses provide power input protection.

SET POINTS LOCAL: Setpoint via access window for built-in potentiometer. REMOTE setpoint via 0 to 5 Vdc or 4 to 20 mA analog signal.

CONTROL VALVES: Mass Flow Controller transmitters include an electromagnetic Control Valve. As a safety feature, the Control Valve is normally closed, thus in case of a power outage the flow of gas would be shut off.