USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
93
Appendix F:
Calibration of WVIA and
TWVIA analyzers
ABB-LGR recommends periodic referencing rather than calibration to ensure measurement
accuracy and consistency.
Water concentration and isotopes are calibrated separately; however, the correct isotope
values must be entered when performing a concentration calibration and vice versa. When
calibration is necessary, follow the procedure detailed below.
To Calibrate the Water Concentration
1.
Connect a Dew Point Generator (Licor LI-610, or similar) to the inlet of the water
vapor isotope analyzer.
2.
Set the dew point generator to 7V, which is equivalent to 10,060ppm H
2
O.
3. Once the water concentration is stable at 7V, create a new data file and run the
analyzer for 5 minutes to get an average value of the
δ
D,
δ
18
O and
δ
17
O isotope
ratios in PP_MIL (‰).
4. Open the Standard Data File (F file) and determine the average values of each
isotope:
a. D_del vs Time
b. O18_del vs Time
c.
O17_del vs Time (if applicable)
5. Click the Setup button on the
User Interface Control Bar. (Figure 88)
Figure 88: User Interface Control Bar
Summary of Contents for GLA132 Series
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