19/07/22 12:45 No readings. Ricardo notified.

Investigated. Aircon had gone into error state (H5) during heatwave. Analysers all hot, several warnings. Turned off NOX and O3 analysers (Fidas looked OK) and leave to cool down overnight.

20/07/22 09:45  Restarted O3 and NO2 - several warnings about temperatures in ovens, cooler etc but also Zero Ozonator flow alarm. This did not right itself - readinsg flat-lining after 24 hrs. (O3 recovered). Callout requested.

22/07/22 Engineer visited. Ozone flow sensor not working , so analyser won't read. Engineer turned off the analyser.

24/08/2022 12:25 - 14:150 Acoem engineer came to install ozonator.

Engineer Reports : Urban Observatory GitHub

https://github.com/urbanobservatory/deployments/blob/master/Precision%20Station%20Reports/TYNE_BRIDGE/22_07_2022_Newcastle%20University_Tyne%20Bridge%20_Callout%20Instrument%20Fault_11369_Marius%20Barbulescu.pdf

NOX data will be missing until this is fixed.