Yokogawa In-Situ Gas Analyzer TDLS200 - Manual (Page 113)

8-12 8-13
IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<8. VALIDATION AND CALIBRATION>
Process/Calibration OPL: N2
Analyzer Purge: N2
This is how the absorption spectra will appear
when there is neither NH3 nor H2O (or any other
target gas for the given application) in the entire
optical path (Process OPL and Analyzer Purge).
This is the absorption spectra appearance
required for an Off-Line Zero Calibration of the
analyzer.
Process/Calibration OPL: ~20ppm NH3
Analyzer Purge: N2
In this Absorption Spectra view, there is practical-
ly zero H2O absorption peak in the approximate
peak center position (PCP) region.
There is approximate 20ppm NH3 (@ approx PCP
~120) absorption in this spectra based on 72.6cm
OPL, ambient temperature and ambient pressure.
Note, other target gases such as CO, CO2, HCN,
etc. will also require only target gas absorption
spectrum at the time of off-line calibration.
This is the typical absorption spectra appear-
ance required for an Off-Line Span Calibration
of the analyzer.
8.2 Off-Line Calibration for Reference Peak Locking Applications:
Zero and Span calibrations MUST be performed as per normal off-line procedures, without using and
Reference Line locking gases.