25/11/2024 18:30 O3 level dropped to a flatline state.

26/11/2024 15:30 Investigated. Flow readings zero on both channels. No blockage found in sample tubes - diagnosis is internal pump failure. This analyser also needs the LED/optical unuit replaced, which is also several thousand pounds. Decision was made to turn off the O3 analyser at this site.

During this period , O3 data will be missing or inaccurate and should be ignored.