DQRID : D140304.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
11/16/2012000012/13/20122045Incorrect
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Subject:
MAG/HTDMA/M1 - Failed humidograph
DataStreams:magaoshtdmaM1.a1
Description:
On 11/29/2012 when the ship was in port it was noticed that the dry air flow into the 
humidigraph was low, about 5 l/min rather than not 20 l/min as required. The operators were 
directed to check the valve and the HEPA filter. This dry air comes from the Petras air 
drier. 

On 12/5/2012, the operators reported that the Petras air drier had failed totally and it 
was later determined that the air pump in the Petras air drier had failed. 

The HT-DMA was turned off 12/8, since dry air is used by this instrument.   The pump was 
replaced 12/13.

All data for this instrument from the beginning of data collection until 12/13 are 
missing, incorrect, or questionable.  Data for this period should be used with caution, if at 
all.
Suggestions: 
Measurements:magaoshtdmaM1.a1:
  • atomizer
  • aerosol_concentration
  • total_concentration
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