DQRID : D120608.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
10/01/2010154004/18/20112010Incorrect
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Subject:
SGP/AOS/C1 - CPC leak
DataStreams:sgpaosC1.a0, sgpnoaaaosC1.b1, sgpaoscpcC1.a1, sgpnoaaaosavgC1.b1, sgpnoaaaosC1.b0,
sgpnoaaaosavgC1.b0
Description:
There was a slow internal leak in the CPC instrument and the data slowly decreased over 
time. The CN concentration is a lower limit and is likely 5 to 20% lower than the actual 
value with higher errors toward the end of the DQR period. The problem was fixed by 
replacing the CPC saturator block.
Suggestions: 
Assume the concentration is low but that the daily trends are correct as they follow 

the CCN profiles.
Measurements:sgpaosC1.a0:
  • CPCPartConc
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sgpnoaaaosavgC1.b0:
  • N_CPC_1_N
  • N_CPC_1
  • N_CPC_1_std
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sgpnoaaaosavgC1.b1:
  • N_CPC_1_N
  • N_CPC_1_std
  • N_OPC_1_N
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sgpaoscpcC1.a1:
  • nozzle_pressure
  • orifice_pressure
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sgpnoaaaosC1.b0:
  • N_CPC_1
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sgpnoaaaosC1.b1:
  • N_CPC_1
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