6
When the CO
2
reading has stabilized, click Span CO
2
.
Setting the secondary CO
2
span
You can set a second span (using a gas that has a CO
2
concentration that is higher or
lower than the primary span gas) to improve the precision of the analyzer. The pro-
cess is exactly the same as setting the primary span, only you'll enter a different con-
centration and click Span2 CO
2
.
Setting the H
2
O zero and spans (LI-850 only)
The water vapor span can be set with a dew point generator such as the LI-610. The
procedure is the same as setting the CO
2
zero and spans, only this uses known con-
centrations of water vapor rather than CO
2
.
Caution: Setting the zero and span incorrectly for either CO
2
or H
2
O will
adversely impact the performance of your instrument. If you do not have the
proper equipment to span the analyzer, it is best to leave it alone.
Recovering from a bad zero or span
If your attempt to zero or span does not go as planned, you can restore the factory
default zero and span settings. The information you need is provided on the cal-
ibration sheet (included with the instrument or available for download from
www.licor.com/env/support/). Under Settings > Calibrations > Advanced, enter the
factory zero and span values for your instrument.
Section 5. Maintenance
5-3Setting the secondary CO2 span
To Next Page
Loading...
Need help?
General
