ASI/TRACEGAS/M1 - Faulty NOy mass flow controller

NOy flow started dropping from the the expected 1.0 L/min at 08:27 UTC on 05/12/2016. It 
continued to fall gradually until on 05/12/2016 at 15:30 UTC it was down to .01 L/min. NOy 
MFC was replaced. As of 05/17/2016 12:22 UTC the instrument is back up and running with 
the correct flow.

Use data with caution

• One minute average of NOx values(nox)
• One minute average of NOy values using nominal sensitivity correction and
  nominal Mo converter efficiency(noy)
• One minute average of NO2 values calculated with nominal sensitivity correction
  and nominal BLC efficiency(no2)
• One minute sample flow average from NOy TEI (this varies as the PreR valve
  switches, so questionable)(noy_flow)
• One minute average of NO values calculated with nominal sensitivity correction(no)

• (Raw data stream - documentation not supported)