Zero
Gas
Regulator
liters/min
1
2
4
3
5
Flow Meter
Vent
r
1
2
4
3
5
eter
Vent
t
3
When the CO
2
concentration has stabilized, click the
Zero CO
2
button.
Setting the primary CO
2
span
When choosing a span gas, we recommend a gas concentration that is close to - but
still slightly above - the upper limit of what you expect to measure. For example, if
you are measuring near-ambient levels, choose a span gas that is near 400 ppm
CO
2
(as opposed to 18,000 ppm). Similarly, if you are measuring concentrations
near 15,000 ppm CO
2
, a span gas with 100 ppm would not be ideal.
4
After zeroing, flow a gas with a known CO
2
concentration through the analyzer at a rate of 0.5
liters per minute.
Section 4. Maintenance
4-7
Setting the primary CO2 span
Summary of Contents for LI-870
Page 1: ...Using the LI 870 CO2 H2O Analyzer...
Page 2: ......
Page 12: ...Section 1 Overview of the LI 870 1 4 Using the LI 870 CO H O Analyzer...
Page 18: ...Section 2 Using the LI 870 2 6 Using the LI 870 CO H O Analyzer...
Page 30: ...Appendix A Specifications A 2 Using the LI 870 CO H O Analyzer...
Page 41: ......
