17/11/2022 10:30 - 18/19:30 O3 Analyser erratic values spiking to +/-5K . Then settled down to normal.

Ricardo notified -

22/11/2022 Acoem investigated (during 6 month service, informal, as no contract for O3) :

Alarms showing for flow sensor and for bulb intensity low. Engineer said issues could be caused by moisture entering the system. Subsequently found that the Zero scrubber was waterlogged, but this is only on during the zero phase.

Decided to remove the Zero scrubber, and see how system behaves over next week. Will probably need a new flow sesnor anyway.

15/09/2022 12:52 -15:24 Acoem engineer installed new O3 Flow transducer

https://github.com/urbanobservatory/deployments/blob/master/Precision%20Station%20Reports/ANGEL/15_12_2022_Gateshead%20Council%20(for%20Newcastle%20University)_Angel%20Of%20The%20North%20_Callout%20Instrument%20Fault_AML11053_Marius%20Barbulescu.pdf

Data will be missing during this period.