As a result of the service on 05/01/2020, the NOx gas cylinder was removed as being contaminated.

See Callout report, Urban Observatory Github

https://github.com/urbanobservatory/deployments/blob/master/Precision%20Station%20Reports/FOUR_LANE/MB05022020_Newcastle%20Uni_Four%20Lane%20Ends_Callout.xls

Quote received : 17/02/2020

Replacement ordered :18/02/20

Replacment installed : 13/03/20 11:00 Approx

NO Cylinder fitted (Cylinder No 4532).
Engineer also left a spare cylinder (114365) on site (originally was ordered extra for Coast Rd)

For details, See Airmonitors Engineers Report :

https://github.com/urbanobservatory/deployments/blob/master/Precision%20Station%20Reports/FOUR_LANE/MB13032020_Newcastle%20Uni_Four%20Lane%20Ends_Commissioning%20NO%20cyl.xls