The Luftsinn Sensor Engine consists of a small microcontroller running a lightweight Linux (Raspberry Pi 3) communicating using the serial interface, a Sensair K30 non-dispersive infrared sensor, a Bosch pressure-temperature-humidity sensor, and a real time clock (for maintaining an accurate time stamp for the log file when not connected to the internet). Coding for each unit is written in Python and includes scripts for local data logging as well as calling Post routines to the SQL database server at luftsinn.com.
Before these units are deployed, they undergo extensive calibration to ensure accuracy and precision of reported CO2 concentrations as well as to collect pressure and temperature dependencies. When implementing the K30 NDIR unit used here, three factors must be accounted for: sensor offset, temperature sensitivity, and pressure sensitivity. Each parameter will be corrected through the implementation of experimentally determined calibration curves programmed into the unit’s software. Each Luftsinn unit undergoes a three-point calibration (0, 400, and 1000 ppm). Concentrations of the standards were confirmed with a cavity-enhanced absorption instrument made by Los Gatos Research.
The Luftsinn Database and Visualization Tools
On line sensors post to a database maintained on this server. Data access will include both mapping and charting options as well as "data dumps" into csv files for downloading.
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page last edited February 6, 2018 by JHM