647C 3. Functionality
23
3.7.2 Gas Selection
MGC 647C V3.0
CH1 CH2 CH3 CH4
ACT.FLOW 0.000 1.750 1.400 0.000
UNIT SCCM SCCM SLM SLM
GAS USER
AIR CO He
2
FACTOR 1.000 1.000 0.700 1.450
STATUS OFF ON ON ON
00 ERRORS FLOW ON INPUT DIRECT
Figure 15
This menu contains the table of Gas Correction Factors (GCF) for mass flow controllers, which are
calibrated in nitrogen under standard conditions (DIN 1871). In this case standard pressure means
1013 mbar and standard temperature is 0 degree centigrade.
The cursor keys (UP/DOWN) are used to scroll through the table entries of each channel.
For gases which are not included in the table, there is the position USER, which allows a direct
numerical input of the GCF of any gas. For a description how to calculate GCF see the manual of
the mass flow controllers. A direct numerical input of the GCF is also allowed for the gases helium
and hydrogen, which are normally calibrated directly with these gases.
The 647C automatically calculates the actual range of each mass flow controller (RANGE FS.)
from the product GCF x RANGE. E.g. for a flow controller, which is calibrated in 1 slm nitrogen, at
a correction factor of 0.72 (methane) the actual flow range (RANGE FS.) displayed in EXTENDED
DISPLAY menu is 0.720 slm.
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