| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000203.3 | SGP/AOS/C1 - CN counter removed | sgpaosC1.a0 |
| D020709.3 | SGP/AOS/C1 - AOS Computer Failure | sgpaosC1.a0, sgpaosauxC1.a0 |
| D021007.1 | SGP/AOS/C1 - Ozone instrument out of service | sgpaosC1.a0, sgpaosauxC1.a0 |
| D980528.1 | SGP/AOS/C1 - Optical Particle Counter (PCASP-X) down | sgpaosC1.a0, sgpaosauxC1.a0 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/16/1999 | 0448 | 01/15/2000 | 0000 |
| 07/08/2002 | 1131 | 08/05/2002 | 1424 |
| Subject: | SGP/AOS/C1 - CN counter removed |
| DataStreams: | sgpaosC1.a0 |
| Description: | The AOS condensation particle counter performance degraded to unacceptable levels and was removed for repair. For the first time period: upon inspection of the internal condition of the instrument, it was found that oil was present in the intake line. It is unknown how this oil could have arrived in this position. The instrument was thoroughly cleaned and back-flushed, and returned to service during the maintenance visit. For the second time period: The degradation of began July 8th. Data collected during this time period are either incorrect or missing and should not be used. |
| Measurements: | sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/23/2002 | 2011 | 05/26/2002 | 2033 |
| 05/27/2002 | 0232 | 05/28/2002 | 1439 |
| 05/29/2002 | 0258 | 05/29/2002 | 1516 |
| 05/29/2002 | 2159 | 05/30/2002 | 1113 |
| 05/31/2002 | 2310 | 06/04/2002 | 1447 |
| Subject: | SGP/AOS/C1 - AOS Computer Failure |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The AOS computer started to experience periodic failures caused by an aging and failing system disk. Replacement of the AOS computer's system disk occurred between 2-4 June 2002. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/30/2002 | 0000 | 10/01/2002 | 1934 |
| Subject: | SGP/AOS/C1 - Ozone instrument out of service |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The ice storm of 30-31 January, 2002 shut down the AOS for ~2 weeks. A controlled power-up of the system found a problem with the ozone monitor. Smoke was observed to come from the ozone instrument, at which time it was shut down. The ozone monitor was removed from the AOS for remote troubleshooting. The cause of the smoke was identified as being from underneath a printed circuit board. At that point, Site Ops staff were requested to send the unit to Boulder for additional troubleshooting. NOAA staff received the unit on 20 February 2002. After a brief inspection, the cause of the smoking was discovered. A one-half inch hole was burned completely through the motherboard. The determination was made that this could not be repaired at the NOAA facility, and a purchase order was initiated to return the unit to Dasibi, Inc. (the manufacturer), for repair/replacement of the motherboard. On 4 March, 2002, NOAA personnel received the OK from ARM to return the instrument to Dasibi, Inc. for service. Dasibi, Inc., received the unit on or around 8 March, 2002. The manufacturer was to test the unit, repair or replace the damaged motherboard, and calibrate the unit according to the NIST standard protocol. On 8 May, 2002, NOAA personnel emailed SGP Site Ops personnel and asked them to check on the status of the repair, which was taking longer then expected. Upon trying to contact the manufacturer, it was discovered that they went out of business. The return of instruments from the manufacturer to customers was being handled by a contract company. The ozone monitor arrived back in Boulder, in an unrepaired state, on or about 1 July 2002. Since there were few other options, NOAA personnel undertook the difficult task of repairing the motherboard. This required the re-routing of several electrical conduits from the burned area in the multilayer board to other acceptable places on the board. This took a considerable amount of electronics technician time and effort. After the motherboard was repaired, extensive testing was required to verify that the repair was done successfully and that other problems were not caused in the unit by the board burning.. The repair was deemed successful on 24 September, 2002. The unit was shipped back to the SGP site immediately thereafter. It was installed during a NOAA AOS maintenance visit on 1 October, 2002. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/01/1997 | 0936 | 07/03/1997 | 1556 |
| 08/01/1997 | 1329 | 08/08/1997 | 1348 |
| 05/05/1998 | 0926 | 06/16/1998 | 1505 |
| 06/09/1999 | 0824 | 07/26/1999 | 2205 |
| 09/08/2000 | 0426 | 10/13/2000 | 1630 |
| 05/17/2002 | 0602 | 05/20/2005 | 1847 |
| 05/23/2002 | 2011 | 05/31/2002 | 1258 |
| 09/09/2002 | 0000 | 10/07/2002 | 1905 |
| Subject: | SGP/AOS/C1 - Optical Particle Counter (PCASP-X) down |
| DataStreams: | sgpaosC1.a0, sgpaosauxC1.a0 |
| Description: | The AOS Optical Particle Spectrometer (PCASP-X sizing probe) was down during these periods. This lowers the laser reference voltage and results in inaccurate sizing. |
| Measurements: | sgpaosauxC1.a0:
sgpaosC1.a0:
|