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intelligent-environments-lab / utx000

Analysis related to the many studies under the UTx000 banner, a project under the Whole Communities, Whole Health initiative.
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CO - 5L Canister Calibration #87

Closed HagenFritz closed 3 years ago

HagenFritz commented 3 years ago

The CO sensors on the beacons were calibrated in the 8m3 chamber assuming a background concentration of approximately zero. However this might not be a fair assumption.

To test this, two batches of three beacons were placed in a 5L chamber with N2 continually pumped through it to remove any other gases. We can compare the results from calibrating with these data to what the results from the chamber were.

Beacons tested: 1, 11, 15, 16, 19 ,21

HagenFritz commented 3 years ago

Values are quite different than what was shown in the chamber. Will need to run more experiments to confirm.

Especially consider Beacons 6, 7, and 46

HagenFritz commented 3 years ago

Stabilization process takes about 8 hours, but that could be due to the warm-up period of the sensors rather than the actual experiment. Therefore, we should try to power on the devices for a few hours BEFORE turning on the N2 to limit the amount we use.

HagenFritz commented 3 years ago

N2 tank depleted, but these experiments might not be necessary. Closing this issue for now.