DQRID : D150511.7
Start DateStart TimeEnd DateEnd Time Data Quality Metric
10/15/2014000002/10/20151530Incorrect
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Subject:
ENA/ACSM/C1 - Clogged critical orifice
DataStreams:enaaosacsmC1.a1
Description:
The inlet pressure of the ACSM at Eastern north Atlantic exhibited a decline beginning 
around 2014-10-15.  This can be seen in the inlet pressure history and the N2 and airbeam 
signal.  The cause for this is an obstruction in the 100 ┬Ám critical orifice.  The 
instrument was shut down in December while waiting for a new critical orifice to be delivered to 
the site in the Azores.  A new procedure for cleaning the critical orifice that did not 
require an ultrasonic bath was tried in 2015-02-10 was successful in unblocking the 
orifice.  This could be a result of large sea salt particles in the system because of the 
proximity of the site to the ocean.
Suggestions: 
Do not use data
Measurements:enaaosacsmC1.a1:
  • sulfate
  • nitrate
  • total_organics
  • ammonium
  • chloride
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