ENA/ACSM/C1 - Clogged critical orifice

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 ?m 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.

Do not use data

• Mass concentration of sulfate, ambient aerosol in air.(sulfate)
• Mass concentration of nitrate, ambient aerosol in air(nitrate)
• Mass concentration of total organics, ambient aerosol in air(total_organics)
• Mass concentration of ammonium, ambient aerosol in air(ammonium)
• Mass concentration of chloride, ambient aerosol in air.(chloride)