S600+ Instruction Manual
Revised July-2017 Chromatographs C-21
Apply NF to each mole percentage value, so that Cn = Cu x NF.
C.9.2 Application of Additionals
Certain systems may have a requirement to carry forward “additional”
mole percentages. These are not measured directly by the
chromatograph but are entered via keypad as the result of a lab
analysis, for example. Usually, additionals are considered to be H
2
S,
H
2
O, He, O
2
, CO, and H
2
. Since these values are assumed to be already
normalized, you may have to readjust the previously normalised
chromatograph mole percentages using the formula:
NF = (100 – Sa) / 100
Apply NF to each previously normalised mole percentage:
Cna(i) = Cn (i)* NF
Be sure to carry forward the additionals unchanged to the Cna mole
percentage set.
C.9.3 C6+ Handling
Chromatographs often report mole percentages up to C6+, but you may
need to break these percentages down to identify hexane, heptane,
octane, nonane, and decane components. Use the following formulas.
Note: If included, this breakdown must add up to 100.0.
Cnas(hexane) = Cna(C6+) x splits(hexane) / 100.0
Cnas(heptane) = Cna(C6+) x splits(heptane) / 100.0
Cnas(octane) = Cna(C6+) x splits(octane) / 100.0
Cnas(nonane) = Cna(C6+) x splits(nonane) / 100.0
Cnas(decane) = Cna(C6+) x splits(decane) / 100.0
Cnas (C6+) = 0.0
Be sure to carry forward the other mole percentages from Cna to Cnas.
C.9.4 C6+ Handling (SIM 2251 Method)
The 2251 can report back the C6+ breakdown using component codes
108 through 111. If you have disabled the Apply Splits” (keyboard
splits) switch, the system breaks down mole percentage reporting as
indicated in the following sections.
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