21/09/2021 03:00 CO analyser started reporting excessively extreme readings +128K

21/09/2021 07:00 CO analyser reading dropped to -9 Million ppm

CO Live reading -8820000 PPM
Reference ratio:-18440
Motor speed:-0.56%.

Motor speed should be 100%.

01/10/02021 13:00 CO level has risen to - 67000 PPM : but still far too high

Reported to Acoem, Ticket 412

04/10/2021 11:00 Machine turned off to avoid possibility of damage to analyser.

06/10/2021 10:35 - 12:40 Acoem Engineer callout

For Engineers Report see Urban Observatory Github

https://github.com/urbanobservatory/deployments/blob/master/Precision%20Station%20Reports/ST_JAMES/MB06102021_Newcastle%20Uni_St%20James%20Blvd_Callout_CO%20fault.xlsx

IR Source replaced.

11/05/2021 CO appears to be 'degrading'  much quicker than normally expected. Needs re-calibration.

CO Data during this period will be inaccurate and should be disregarded.