We are streaming (and archiving) CO2 levels we are measuring in air from outside Memorial Hall, located here. The actual Licor 820 analyzer we use is located in Room 7130, approximately where the “M” in Memorial is in this map:
The analyzer is connected to a small, 12V, ~$20 aquarium pump (Halper Mini Pump, Type: GSV2512N), which we power via an AC adapter.
Values are read every 12 seconds, and then averaged to produce this up-to-the-minute badge. We calibrate the instrument regularly, using both 0 ppm “zero” gas and 1000 ppm calibration gas (a 1-point span). Check the FAQ for when the instrument was last calibrated.
Caveat emptor: we are trying to figure out how to get the thin gray vertical lines to correspond to midnight, instead of 20:00 or 8 pm.
Webpages can link to the Memorial Hall badge, which updates every minute (step-by-step WordPress instructions?); this provides a higher resolution record than this type of widget available from co2now.org.
Sufi, could you insert this
CO2 widget here?
There is a lot more information here at the Scripps website.
We are working on cleaning this tool up. Stay tuned.
Please note the straight lines (eg July 7-September 17) represent missing data due to, for example, instrument malfunction or use for other purposes (see FAQ). No details are provided for times of missing data: graph is not “clickable” for these … Continue reading
Carbon dioxide (parts per million) data are measured every 12 seconds, averaged every minute, and recorded/stored on a JMU Center for Instructional Technology web server every minute. You can download–as a comma separated values (.csv) file–the current month of data … Continue reading
Here are notes from our conversation today (Sept. 1, 2011). A page on this website will provide dynamic graphs of CO2 levels outside Memorial Hall. These might be a daily graph, a weekly graph, and an annual graph. Here are … Continue reading