R36US0002EU0100 Rev 1.00
Page 12
Aug 26, 2021
RTD120D-EVK Evaluation Kit Software Manual
9. To write this calibration point to flash memory, press:
10. Now you can turn off the gas supply valve if you are using a calibration gas canister, or otherwise remove the
reference gas source (or remove the kit form the gas chamber, plastic bag, etc.). If you are using outdoor air
as the reference gas then nothing more needs to be done.
11. Repeat the above steps for each remaining calibration point of CO
2
concentration. Note that it is okay if you
only click “Flash Write” once, after setting all of the calibration points, but it is a good idea to save after each one.
The EVK is now calibrated, and the kit will immediately begin computing and reporting the CO
2
concentration of
gas in the aluminum gas chamber. While DAQFactory is still connected to the kit, the “CO
2
Concentration” plot will
continuously display the CO
2
values over time.
It may take a minute or two for the calibration gas (especially 1000 or 2000 ppm) in the chamber to be replaced by
nearby ambient air, so the CO
2
concentration reading will gradually converge toward the measured value.
Note
: You can repeat the calibration steps at any time for any or all of the three or four calibration points (0, 1000,
400, and/or 2000 ppm) independently, and in any order. The last saved raw reading for any given calibration
points will be used in the CO
2
concentration calculation.
