Data Quality Reports for Session: 136378 User: cbrandau Completed: 07/24/2011

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D100715.3GRW/AOS/M1 - CCN Detector misalignmentgrwaosccnM1.a1


DQRID : D100715.3
Start DateStart TimeEnd DateEnd Time
06/02/2010180007/13/20101600
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:
  • AOS number concentration of CCN(N_CCN)
  • AOS CCN number concentration by bin(N_CCN_dN)
  • AOS bin number of lowest channel of OPC include in summation of N_CCN(N_CCN_bin_number)

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