Fluke GFS dynamic gravimetric mass flow system

GFS™ delivers a true Primary Mass Flow Standard and makes the fundamental measurement of low gas mass flow rates in flow control systems practical.

GFS™ delivers a true Primary Mass Flow Standard and makes the fundamental measurement of low gas mass flow rates in flow control systems practical. GFS primary mass flow measurements offer very low uncertainty values for independent metrology support of precision transfer standards like molbloc-L and molbloc-S, used for gas flow controller and other gas flow controlling device calibrations.

  • Covers the range of 0.2 to 200 mg/s in various gases (10 sccm to 10 slm N2)
  • Supported gases: Non-corrosive, non-toxic gases
  • Flow measurement uncertainty as low as ± 0.013% of reading
  • Maximum outlet pressure: 650 kPa absolute
  • Primary gravimetric principle using mass and time measurement
  • Automated unattended operation possible

The GFS dynamic gravimetric mass flow calibration system consists of an electronic mass balance, enclosure, and electronic instruments required to make accurate real-time measurements of depleted gas mass in flow control systems, and the time duration over which it has run.

In order to improve thermal stability and dampen vibrations, the balance is placed upon a large granite plate and surrounded by a draft enclosure. In this system the test gas is supplied by a pressurized cylinder which rests on the balance and whose mass is measured continuously to determine the quantity and rate of depleted mass during a test. The elapsed time over which this takes place is measured by a high-speed USB counter/timer connected to the system controller. Various non-corrosive gas species can be used with this system, simply by evacuating the reference cylinder and pressurizing with the media of choice.

A dedicated PC-based software program (GFSTools™) has been developed to act as the central control of the instrument and interface to the user. Discrete and averaged values of balance and device under test output are recorded and the results are calculated and displayed in terms of total mass and mass flow.

Compensation of measurements for ambient pressure, temperature, and humidity, and balance drift are all performed by GFSTools. Automated test setup, data reporting and flow control are also handled by the program.


GFS General Specifications

Power Requirements
Balance 100 to 240 VAC, 50 to 60 Hz, 27 W max. consumption
LCM 100 to 240 VAC, 50 to 60 Hz, 40 W max. consumption
MFC-CB 85 to 264 VAC, 50 to 60 Hz, 36 W max. consumption
Operating Temperature Range 15 to 25 °C
Humidity Range 5 to 70% RH, non-condensing
Granite table and stand 320 kg (700 lb) approximate
Rest of system 70 kg (150 lb) approximate
Enclosure on Granite Table w/stand 150 cm H x 90 cm W x 60 cm D (58 in. x 36 in. x 24 in.)
LCM 8 cm H x 22.5 cm W x 20 cm D (3.1 in. x 8.9 in. x 7.9 in.)
MFC-CB 8 cm H x 22.5 cm W x 20 cm D (3.1 in. x 8.9 in. x 7.9 in.)
GFS-FS 20 cm H x 41.4 cm W x 20 cm D (7.9 in. x 16.3 in. x 7.9 in.)
Supported Gases Nitrogen (N2), Air, Argon (Ar), Carbon Monoxide (CO), Helium (He), Oxygen (O2), Carbon Dioxide (CO2), Carbon Tetrafluoride (CF4), Ethane (C2H6), Ethylene (C2H4), Fluoroform (CHF3), Hexafluoroethane (C2F6), Hydrogen (H2), Methane (CH4), Nitrous Oxide (N2O), Sulfur Hexafluoride (SF6), Xenon (Xe)
Flow Measurement Range at least:
He, H2 100 sccm to 10 slm
All other gases 10 sccm to 10 slm
Pressure Connections
outlet flow path from enclosure
1/8” Swagelok tube fitting or equivalent, with adaptor to 1/4” Swagelok tube fitting or equivalent
Reference Gas Cylinder Pressure Limit 20 MPa (3000 psi)
CE Conformance Available, must be specified.



Model Name


GFS2102 Dynamic gravimetric mass flow system


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