Analyzer Timing
| Appendix C-3
Operation Sequences
Zero Calibration
Period 5 →Period 6→Period 3
Photo-Span Calibration (not congured for steam blowback period)
Period 5→Period 6 →Period 7→Period 8→Period 3
Photo-Span Calibration (congured for a steam blowback period)
Period 5→Period 6→Period 7→Period 8→Period 9→Period 10→Period
11→Period 5
Period 5 – Flush and Zero
During Period 5, the sample system is flushed with instrument air and a
zero calibration is performed. The analyzer will also adjust the lamp flash
count for each of the detectors during the zero process. At the end of the
period, the detector readings are saved and the analyzer advances to Pe-
riod 6. The analog outputs will be held at the last value in Period 4 and the
data valid contact will be open.
Period 6 – Track Zero
This is an intermediate state that is used to determine the next period.
• If only a zero calibration is required the next state will be Period 3.
• If a photo-span calibration is required, the next period will be Period 7.
Period 7– Photo-Span Calibration
The span procedure occurs during this period. The span factors are up-
dated if an adjustment has been configured. The sample cell continues to
be flushed with instrument air. The data valid contact will be open and
the analog outputs held at the last valid value. Once the timer elapses, the
analyzer advances to Period 8.
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