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4-15
2000-OSM, F1
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.
0
90
TIME (in seconds)
A
B
C
Figure 4-12. CHROMATOGRAM OF ANALYSIS
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
OTHER DATA
Time
Function
Value
Method
Table
No.:
1
Analysis
Cycle
Time:
90
sec
0001
Valve
On
One
Calibration
type:
external
std
0005
Valve
Off
One
Analysis
Normalization:
no
0006
Stream Step
N/A
Primary Cal Stream: 10
0007
Auto Zero
N/A
Secondary Cal Stream: not used
0012
Slope Detect
On Now
Benchmark Stream: not used
0020
Valve
On
Two
Multiplier
Exponent:
0
0021
Valve
Off
Two
K
Factor:
1
0030
Component
One
Component
Units:
PPM
0040
Valve
On
Three
Key
Component:
#2
0041
Valve Off
Three
Retention Time Deviation: ±5 sec
0050
Component
Two
Response
Factor:
1
0060
Valve On
Two required
Calibration Concentration: 100
0061
Valve Off
Two for each
Benchmark Concentration: 100
0070
Component
Three component
High Concentration Alarm: 100
0089
Slope Detect
Off Now
Low Concentration Alarm: 0
Calculate
By:
area
In Primary Cal Stream: yes
Figure 4-13. DATA FOR METHOD TABLE
To construct this method table perform the following steps:
1. On the Background screen, press the F1 (Exit to Commands) soft key.