2. SYSTEM OVERVIEW
Page 15
© 2007 DH Instruments, a Fluke Company
2.10
MOLBLOC MOLSTICS (OPTIONAL)
If calibration of molblocs or MFC’s will be the primary use of the GFS, it is recommended to use molstics
for the ease of setup. There are several types of molstics, but the two that ideally fit the GFS system are
the single low flow (PN 401316) and single mid flow (PN 401244). These molstics each come with a
filter, regulator, manual shutoff valve, molbloc cradles, and MFC supports.
Depending on the Reference Gas Cylinder selected, the output of the GFS is either 690 kPag (100 psig)
or 550 kPag (80 psig). For most applications this pressure will need to be regulated down to an
operational pressure before going through the device under test (DUT). For example, a LoP calibrated
molbloc at 270kPaa (39 psia) or a HiP calibrated molbloc at 525kPaa (76 psia).
If molstics are not to be used, then at a minimum a filter, regulator, and manual shutoff valve are
recommended, and consideration will have to be given to the varying height locations of these
connections as well as those of any molblocs, MFC’s, or other DUT’s to be connected.
2.11
MASS SET (OPTIONAL)
If additional assurance is required to prove the balance is correctly operating in the range of normal use
from 1.6kg to 2.3kg, then the mass carrier (MS-2102-CAR) or the mass set (MS-2102-0.7) which includes
a mass carrier can be ordered. The carrier allows for a quick exchange with the Reference Gas Cylinder
and is designed to weigh approximately 1.6kg in order to simulate an empty gas cylinder. The carrier
provides a platform outside of the AMH for the placement of masses in order to check the balance
performance without having to remove the plates of the AMH. The mass set includes three 200g masses
and one 100g mass, which in combination allows for a measurement every 100g up to 2.3kg. For
detailed instructions on the use of the mass carrier and masses see section 7.8.3.