DQR ID | Subject | Data Streams Affected |
---|---|---|
D100715.3 | GRW/AOS/M1 - CCN Detector misalignment | grwaosccnM1.a1 |
D111005.3 | GRW/AOS/M1 - CCN signal decline | grwaosccnM1.a1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/02/2010 | 1800 | 07/13/2010 | 1600 |
Subject: | GRW/AOS/M1 - CCN Detector misalignment |
DataStreams: | grwaosccnM1.a1 |
Description: | The CCN signal was unusually low about 100 particles/cc. The %SS growth curves were asymmetrical. Upon consultation with the manufacturer, DMT, it was predicted that the OPC detector was clogged or misaligned. I had the tech, Carlos, remove the detector and ship it back to Boulder. The detector was cleaned. An o-ring for a lens wasn't properly seated. The OPC was sent back to GRW and installed. Data looks normal after the reinstallation on July 13th. |
Measurements: | grwaosccnM1.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/01/2010 | 0000 | 06/02/2010 | 1800 |
Subject: | GRW/AOS/M1 - CCN signal decline |
DataStreams: | grwaosccnM1.a1 |
Description: | There was a slow decline in the CCN signal from January to June of 2010 at GRW. The reason for this decline is unknown as all the instrument operating parameters appear normal. The decline was likely from a change in the CCN column thermal properties or a clogging of the detector inlet. |
Measurements: | grwaosccnM1.a1:
|