1. INTRODUCTION
Page 1
© 2007 DH Instruments, a Fluke Company
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GFS2102 is a primary gravimetric gas flow measurement standard. It is intended for use in calibrating
gas flow transfer standards or other flow devices requiring a very low uncertainty reference. GFS2102 is
recommended when low uncertainty is the primary requirement of a flow measurement or the ability to
internally maintain traceability of mass flow measurements is desired. GFS2102 covers the range of
10 sccm to 10 slm in most gases.
GFS2102 measures gas mass flow by measuring the loss of mass from a reference gas cylinder over a
measured period of time. The reference gas cylinder assembly rests on the GFS mass balance and flow is
transmitted from the cylinder through a flow path designed to have minimal effect on the balance mass
measurement. Balance mass and time measurements and a number of ambient conditions are all read using
a component of the GFS2102 system called LCM, the Laboratory Conditions Monitor. Since test times may
be long, a special automated mass handling platform is used to load a fixed reference mass on the GFS
balance at intervals thoughout the test to quantify and remove any effects from balance drift over time.
All measurement functions of the GFS2102 system are operated by a system controller (personal
computer) running GFS Tools software. The system is made up of several individual components
working together and controlled by GFS Tools.
1.1
SPECIFICATIONS
1.1.1
GFS2102 GENERAL SPECIFICATIONS
Power Requirements
Balance
LCM
MFC-CB
100 to 240 VAC, 50 to 60 Hz, 27 W max. consumption
100 to 240 VAC, 50 to 60 Hz, 40 W max. consumption
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
Weight
Granite table and stand
Rest of system
320 kg (700 lb) approx.
70 kg (150 lb) approx.
Dimensions
Enclusure on Granite Table w/ stand
LCM
MFC-CB
GFS-FS
150 cm H x 90 cm W x 60 cm D (58 in. x 36 in. x 24 in.)
8 cm H x 22.5 cm W x 20 cm D (3.1 in. x 8.9 in. x 7.9 in.)
8 cm H x 22.5 cm W x 20 cm D (3.1 in. x 8.9 in. x 7.9 in.)
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
He, H2
All other gases
at least:
100 sccm to 10 slm
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.