Preparing A Method Table - ABB PGC2000 Operation And Service Manual

between the various components is established (at installation), only the K-factor is changed
during calibration.

Preparing a Method Table

This subsection explains how to prepare a method table by constructing a sample method table.
Figure 4-12 shows a chromatogram of the analysis to be controlled. This analysis is 90 seconds long
and has three components to measure: A, B, and C. These components elute at the following times
(after the start of the analysis): component A, 30 seconds; component B, 50 seconds; and
component C, 70 seconds.
In order to construct a method table for this analysis, you need to know when to turn valves on and
off, how the components are defined, and how to measure the components. For this analysis we
shall use slope detection, which is described in detail in "PEAK DETECTION." Figure 4-13 illustrates
the data needed to construct a method table for this analysis.
TIME-RELATED DATA
Time Function
0001 Valve On
0005 Valve Off
0006 Stream Step
0007 Auto Zero
0012 Slope Detect
0020 Valve On
0021 Valve Off
0030 Component
0040 Valve On
0041 Valve Off
0050 Component
0060 Valve On
0061 Valve Off
0070 Component
0089 Slope Detect
To construct this method table perform the following steps:
1. On the Background screen, press the F1 (Exit to Commands) soft key.
4-15
A
0
TIME (in seconds)
Figure 4-12. CHROMATOGRAM OF ANALYSIS
Value
One
One
N/A
N/A
On Now
Two
Two
One
Three
Three
Two
Two
Two
Three
Off Now
Figure 4-13. DATA FOR METHOD TABLE
C
B
Method Table No.: 1
Analysis Cycle Time: 90 sec
Calibration type: external std
Analysis Normalization: no
Primary Cal Stream: 10
Secondary Cal Stream: not used
Benchmark Stream: not used
Multiplier Exponent: 0
K Factor: 1
Component Units: PPM
Key Component: #2
Retention Time Deviation: ±5 sec
Response Factor: 1
required Calibration Concentration: 100
for each Benchmark Concentration: 100
component High Concentration Alarm: 100
Low Concentration Alarm: 0
Calculate By: area
In Primary Cal Stream: yes
90
OTHER DATA
2000-OSM, F1