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7. For Single Gas Library Application: Inject first volume and wait for
absorbance to stabilize. Record absorbance value. Air out the instrument and
repeat until the absorbance returns to zero (±0.0010 AU). Reconnect the
pump and repeat for each injection volume. Rezero the instrument if the
absorbance is outside of the allowable ±0.0010 AU.
For Multi Gas Library Application: Inject first volume and select "Enter=new
sample". Wait for absorbance reading to appear. Record absorbance value at
all wavelengths, and repeat for all concentrations and compounds. Flush the
system until absorbance returns to zero by disconnecting the pump and
exhausting the system (e.g., by attaching an exhaust line to the out port of the
instrument). Attach the closed loop pump and select "2=Zero". Repeat steps
3-7.
Note: Depending upon the compound it may not be necessary to flush the system
after each injection. For example, if the absorbance value stabilizes, introduce the
difference between injection values. This will save time. If, however, the absorbance
value continues to fall, it will be necessary to flush the system, and introduce the new
injection volume value (e.g., by attaching an exhaust line to the out port on the
instrument.
G. GENERATE THE P-MATRIX
Note : The following assumes Microsoft Excel is used to generate the P-Matrix. The
procedure may differ if other programs or instruments, such as a calculator, are used.
1. For Single Gas Library Application: Enter absorbancies from the individual
compound injections made during the calibration in one column starting at
cell B2. Absorbancies should be entered to four decimal places.
For Multi Gas Library Application: Enter absorbancies starting at cell B2.
Enter absorbancies for each wavelength in adjacent columns. Absorbancies
should be entered to four decimal places. Enter the next compound directly
below the first compound (see example, below).
Compound 1
Compound 2
Appendix C Scan/Calibration Procedure
Wavelength
1
2
0.0058
0
0.0128
0
0.0217
1
0.0001
100
0.0002
214
0.0002
355
C-11
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