Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 117)

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IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<8. VALIDATION AND CALIBRATION>
A validation cycle consists of first capturing a process gas only spectra (1), then adding the validation gas
to the validation cell and capturing a spectra (2) and then removing the validation gas and finally capturing
a second process gas only spectra (3). Spectra (1) and (3) are then averaged spectra as they represent the
process gas only before and after validation. Spectra (2) is the combination of process and validation gas so
when the averaged (1)(3) spectra is subtracted, the peak area remaining is that of the validation gas (at 4”
OPL, ambient temperature and pressure). This area measured for validation gas should therefore match the
expected value because all other parameters are known.
If the measured true peak area matches that of the calculated peak area then the analyzer passes ‘On-Line
Validation’.
The On-line Validation interval is user selectable.
• Daily (Recommended for low level or critical applications)
• Weekly
• Bi-weekly
• Monthly
Figure 61