pCO2 / Dissolved Inorganic Carbonates Measurements
While it is possible to build your own pCO2 or Dissolved Inorganic Carbonates (DIC) system, it is not a trivial undertaking. Building a pCO2 system requires many sophisticated components, precise construction, access to expertise on a variety of topics, and knowledge of the materials that will be required. Research quality pCO2 systems are often designed following years of research and development. Whether to purchase or build depends on whether you have access to the expertise needed to build your own system or whether commercial systems meet your specific needs.
All current models of LI‑COR closed-path IRGAs feature user cleanable optical benches, optical cell pressure and temperature correction, and user settable zero and span.
The LI‑820 CO2 Analyzer and LI‑840A CO2/H2O Analyzer offer continuous monitoring over a wide range of environmental conditions. Both have low power requirements, low signal noise, and high stability with low zero and span drift. They can be remotely configured using a subset of the eXtensible Markup Language (XML). The LI‑820 is used in the Battelle autonomous buoy pCO2 systems. Visit the LI‑COR website for more detailed specifications on the LI‑820 and LI‑840A.
The LI‑7000 provides fast response and highly accurate measurements of the mole fraction of CO2 and water vapor. It is a dual cell differential gas analyzer with user settable signal filtering and high precision temperature and pressure measurements, as well as correction for band broadening due to the presence of water vapor. The LI‑7000 is a high performance gas analyzer, featuring very low signal noise, high precision, and excellent long-term stability. It replaced the LI‑6251 and LI‑6252 CO2 Gas Analyzers as well as the LI‑6262 CO2/H2O Gas Analyzer which were used in underway pCO2 systems over the years.