GPT & BLC Testing

22:05 UTC Begin equilibrating 100 ppb NO @ 5000 sccm with 15.7% lamp O3 (nominally 50 ppb in 2500 sccm)

00:06 UTC Begin NOxy cal GPT point

00:17 UTC Not much NO2 generated (if any), increased O3 to 18.1% lamp (nominally 100 ppb in 2500 sccm) to see the response

00:38 UTC Increase O3 lamp to 19.8%, some increase in NO2 (~3 ppb) between previous level and the first

01:10 UTC Unplugged power from BLC, NOx dropped ~3 ppb

01:22 UTC Plugged BLC power back in, no change

01:28 UTC Replugged BLC power, lamps back on

01:31 UTC Start zero air

01:38 UTC Resume sampling