ENA/CPC/C1 - Butanol Exhausted

Butanol was not available for startup.  Operators were able get instrument started with 
small amount of butanol in the HTDMA.  Data recovery not possilble.  

Resumed operation with refill of butanol.

• East longitude(lon)
• laser_current
• nozzle_pressure
• time
• ambient_temp
• Computed concentration(concentration)
• time_offset
• optics_temp
• orifice_pressure
• condensation_temp
• Altitude above mean sea level(alt)
• saturation_temp
• North latitude(lat)
• base_time
• cabinet_temp

ENA/CPC/NEPH/PSAP/C1 - Impactor not installed

No impactor installed.  All data is the same as when impactor at 10 um setting.

• laser_current
• nozzle_pressure
• optics_temp
• orifice_pressure
• ambient_temp
• condensation_temp
• saturation_temp
• Computed concentration(concentration)
• cabinet_temp

ENA/CPC/C1 - Computer Failure

Data were lost due to a failed CPU unit

• East longitude(lon)
• laser_current
• nozzle_pressure
• time
• ambient_temp
• Computed concentration(concentration)
• time_offset
• optics_temp
• orifice_pressure
• condensation_temp
• Altitude above mean sea level(alt)
• saturation_temp
• North latitude(lat)
• base_time
• cabinet_temp

ENA/AOS/C1 - AOS Instrument Repair, Calibration and Modification: Mentor Site Visit

There was visit of 7 AOS instrument mentors to the ENA AOS during this period of 
instrument repair, calibration and modification. Instruments were occasionally off, or with no 
sample flow, or receiving calibration samples, etc. There was no productive sampling of 
ambient air during this period other than for testing. No data should be used for this period 
as ambient samples.

Note: Two datastream are missing. The CAPS Extinction Monitor and the Greenhouse gas 
instrument.

• laser_current
• nozzle_pressure
• optics_temp
• orifice_pressure
• ambient_temp
• condensation_temp
• saturation_temp
• Computed concentration(concentration)
• cabinet_temp

ENA/CPC/C1 - Instrument problem

Vacuum was lost very briefly to the instrument for an unknown reason.  The instrument then 
showed evidence of flooding by an increase in the frequency of the butanol fill cycles, 
increase in nozzle pressure, and decrease in orifice pressure.

• Computed concentration(concentration)

ENA/CPC/C1 - Instrument problem

It was found that the wrong vacuum source was connected to the vacuum port on the CPC and 
didn't provide enough pull for the instrument to run correctly.  While the problem was 
being rectified, there was a period where the CPC was sampling from the instrument cabin 
and not from the ambient.  Therefore data during this time is not representative of the 
ambient concentration of aerosol in the atmosphere and should not be used as such.

• Computed concentration(concentration)

ENA/CPC/C1 - Instrument Not Sampling due to repair and calibration

During this period the CPC was shipped back to the manufacturer to mitigate damage due to 
flooding. The instrument was found to be flooded. Repair and calibration was performed. 
Most of the down time was related to delays in shipment due to customs on Terceira Island.

• East longitude(lon)
• laser_current
• nozzle_pressure
• time
• ambient_temp
• Computed concentration(concentration)
• time_offset
• optics_temp
• orifice_pressure
• condensation_temp
• Altitude above mean sea level(alt)
• saturation_temp
• North latitude(lat)
• base_time
• cabinet_temp

ENA/CPC/C1 - Data reprocessed to account for vacuum port too low

Recorded calibrations relating the effect on flow of reduced nozzle and orifice pressure 
was used to correct the data.

When the CPC was put back in operation, the external vacuum port was connected to a vacuum 
line, which didn't provide enough pull.

• Computed concentration(concentration)

ENA/CPC/C1 - Reprocess: reprocessing from raw data in preparation for not-yet-released b1 
level

End to end reprocessing to generate new a1 datastreams is needed so that when the 
harmonization software is released to production, we will be ready with the a1 datastreams that 
are input to the subsequent processing software.

• East longitude(lon)
• laser_current
• nozzle_pressure
• time
• ambient_temp
• Computed concentration(concentration)
• time_offset
• optics_temp
• orifice_pressure
• condensation_temp
• Altitude above mean sea level(alt)
• saturation_temp
• North latitude(lat)
• base_time
• cabinet_temp

ENA/CAPS-PMEX/CPC/NEPHELOMETER/PSAP/C1 - Impactor not switching

AOS tech was working in the AOS and accidentally unplugged the impactor power supply. This 
left the impactor in the 10 micron state.

• laser_current
• nozzle_pressure
• optics_temp
• orifice_pressure
• ambient_temp
• condensation_temp
• saturation_temp
• Computed concentration(concentration)
• cabinet_temp

ENA/CAPS-PMEX/CPC/NEPHELOMETER/PSAP/C1 - Impactor size switch not connected

Impactor installed and plumbed, HOWEVER, the impactor's 'size read' switch NOT connected.

• laser_current
• nozzle_pressure
• optics_temp
• orifice_pressure
• ambient_temp
• condensation_temp
• saturation_temp
• Computed concentration(concentration)
• cabinet_temp

ENA/C1 - Reprocess: Slightly incorrect location fields

Some of the instruments are being processed with the previous "GRW-Azores" lat/lon/alt 
instead of the new "ENA-Azores" lat/lon/alt. The differences are minor, but will be 
corrected. The respective GRW and ENA lat, lon, and alt values are as follows:
 
GRW  lat = 39.0911 ;
ENA lat = 39.0916 ;
GRW  lon = -28.0297 ;
ENA  lon = -28.0257 ;
GRW  alt = 26 ;
ENA  alt = 30.48 ;

• East longitude(lon)
• Altitude above mean sea level(alt)
• North latitude(lat)

ENA/AOS/C1 - incorrect data

During a measurement of the inlet flow rate, the cpcf inlet became plugged and the 
instrument was flooded with butanol.  After removing the butanol and allowing the system to dry, 
the cpc returned to normal operation.

• Computed concentration(concentration)

ENA/CPC/C1 - New pump slightly under pressure

Due to a pump failure, a different pump was used on the system.  The orifice pressure was 
lower with this additional pump and the system may have been slightly under the pressure 
required to maintain critical flow on the CPC's critical orifice. Flow rate measurements 
during this time show very little change in the output flow rate.

• Computed concentration(concentration)

ENA/AOS/C1 - Flow problem affecting concentrations

Due to a flow problem with another instrument on the same sample line, the concentrations 
reported by the CPC are not representative of the atmospheric concentration of particles

• Computed concentration(concentration)

ENA/AOS/C1 - Instrument mentors working at the site

Instrument mentors working at the site. Sample lines and electrical connections being 
reconfigured. Instruments that had no work done on them may still be affected.

• dilution_flow_setpoint
• laser_current
• nozzle_pressure
• ambient_temp
• fraction_full
• ambient_pressure
• Computed concentration(concentration)
• liquid_level
• dilution_valve_position
• optics_temp
• orifice_pressure
• condensation_temp
• saturation_temp
• cabinet_temp
• dilution_flow_reading