Calculating cell temperature (closed path systems only)

The LI-7200 Enclosed CO₂/H₂O Analyzer features two fast measurements of the cell temperature: one at the inlet (T_in) and one at the outlet (T_out) of the cell. It computes the average cell temperature (T_cell) with a weighted average of these two fast measurements as:

6‑1

You can select either or all of the three temperatures as outputs, which are stored in the raw files.

When the data are processed, however, T_in and T_out are used to compute T_cell sample by sample, if the latter is not available. Thus, before any other processing step, EddyPro does the following:

• If T_cell is available, does nothing. In this case, EddyPro will ignore columns of T_in and T_out (if present in the raw files and selected for processing);
• If T_cell is not available:
  • If T_in and T_out are both available, calculate T_cell sample-by-sample using the weighted average equation above;
  • If T_in is available and T_out is not, sets T_cell=T_in;
  • If T_out is available and T_in is not, sets T_cell=T_out;
• If T_cell, T_in and T_out are not available, T_cell is not defined. In this case, average cell temperature will be set equal to average sonic temperature (corrected for humidity effects).