DH Instruments GFS2102, Руководство по эксплуатации и обслуживанию, Страница: 21 / 206

2. SYSTEM OVERVIEW
Page 5 © 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. GFS2102 covers the range of 10 sccm
to 10 slm in most gases. All measurement functions of the GFS2102 system are managed 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, which is the user interface for the GFS2102 instrument.
Figure 1. GFS2102 system
1. Precision mass balance 8. Catenary gas conveyance loop
2. Reference mass 9. Laboratory conditions monitor
3. AMH-GFS2102 automated mass handler 10. MFC control box
4. IR probe 11. Flow terminal (for device under test)
5. Reference gas cylinder 12. Mass flow controller
6. Ambient conditions probe 13. Device under test
7. Ambient conditions probe
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 that is placed on
a vibration isolation table and inside an insulated draft enclosure. Flow is transmitted from the cylinder and out
through the enclosure wall in a flow path designed to cause minimal effect on the balance mass measurement.