Filter Media; Data Safety - Aethlabs microAeth MA Series Operating Manual

Example Response Message for AethLabs Implementation of Bayern-Hessen Protocol
The following hypothetical dataline (DualSpot) that might be available on the instrument at the time
the 'DA' command message is issued:
MA200-0011,25157,18,1,1.08,2018-12-06T20:29:01.00,-480,37.746172547,-122.
420371919,0.146,60,64,100,342,-611,
-24357,1,100.00,99.99,58.56,41.43,32.95,23.97,9.69,100596.00,33.62,DS-UV-B-G-R-IR,
681907,622183,917573,25.9730,18.4158,-0.0198,780829,620878,736176,19.5300,13.7320,
-0.0103,781964,625168,706936,16.6708,11.6571,0.0168,806763,690497,782392,13.4350,9.3264,
-0.0353,675814,773992,951767,9.4010,6.3921,
-0.1671,415,374,274,396,376,330,427,478,594,377,340,255,510,410,198,5D91
Expected response message:
MD07 001 +2740+02 00 00 011 000000 002 +3300+02 00 00 011 000000 003 +5940+02 00 00 011
000000 004 +2550+02 00 00 011 000000 005 +1980+02 00 00 011 000000 006 +1000+02 00 00 011
000000 007 +1000+00 00 00 011 000000
Expected response message values:
Blue BCc 330
Green BCc 594
Red BCc 255
FlowTotal 100
Tape Position 1

5.10. Filter Media

The sample collection and analysis is performed on a roll of polytetrafluoroethylene (PTFE) filter tape that is
housed in the filter tape cartridge. As the aerosol sample is drawn through the filter media by the instrument's
integrated, internal sample pump, the aerosol sample collects gradually on the filter medium to create a
gray spot 3mm in diameter. The microAeth determines the optical attenuation as the accumulated particles
increase the optical density of the filter spot. After the optical density reaches a certain level, which is set by
the ATN Tape Trigger setting, the filter spot must be replaced to maintain measurement integrity. The filter
tape roll is automatically advanced to provide a new clean spot location for sampling. IMPORTANT: Do not
rewind the filter tape cartridge, or use previously sampled filter tape sampling locations.
The tape position counter counts each time the filter tape cartridge advances. This counter is reset every time
the tape clamp mechanism is released and then reclamped. The instrument does not specifically know the
position of the filter tape in the filter tape cartridge in relation to the beginning or end of a filter tape cartridge.
The user is responsible for keeping track of this process using the counter as a guide. The instrument is able
to know and notify the user when a filter tape cartridge has reached the end of the tape.

5.11. Data Safety

AethLabs highly recommends keeping a prestine backup of the original data collected on the instrument in an
exported file.
52 microAeth MA Series MA200, MA300, MA350 Operating Manual
®
UV BCc 274
IR BCc 198
6. Viewing and Analyzing Measurement Data
6.1. Data File Structure
The data files exported through the microAeth Manager are plain text with the extension .csv. Each data
file consists of a header containing descriptive information; a line identifying the data columns; and then a
number of data lines with each item separated by a comma. As the microAeth is starting a new sampling and
measurement session, the first few minutes of data do not contain the BC calculation; all subsequent lines of
data show this value except during an automatic tape advance.
Exported Data File Structure:
Serial number, Datum ID, Session ID, Data format version, Firmware version, App version, Date / time local,
Timezone offset (mins), Date local (yyyy/MM/dd), Time local (hh:mm:ss), GPS lat (ddmm.mmmmm), GPS long
(dddmm.mmmmm), GPS speed (km/h), GPS sat count, Timebase (s), Status, Battery remaining (%), Accel
X, Accel Y, Accel Z, Tape position, Flow setpoint (mL/min), Flow total (mL/min), Flow1 (mL/min), Flow2 (mL/
min), Sample temp (C), Sample RH (%), Sample dewpoint (C), Internal pressure (Pa), Internal temp (C), Optical
config, UV Sen1, UV Sen2, UV Ref, UV ATN1, UV ATN2, UV K, Blue Sen1, Blue Sen2, Blue Ref, Blue ATN1,
Blue ATN2, Blue K, Green Sen1, Green Sen2, Green Ref, Green ATN1, Green ATN2, Green K, Red Sen1, Red
Sen2, Red Ref, Red ATN1, Red ATN2, Red K, IR Sen1, IR Sen2, IR Ref, IR ATN1, IR ATN2, IR K, UV BC1, UV
BC2, UV BCc, Blue BC1, Blue BC2, Blue BCc, Green BC1, Green BC2, Green BCc, Red BC1, Red BC2, Red
BCc, IR BC1, IR BC2, IR BCc
Exported Data File Structure Details
Header
Serial number
Datum ID
Session ID
Data format
version
Firmware
version
App version
Date / time local
Timezone offset
(mins)
Date local
(yyyy/MM/dd)
AethLabs AethLabs
Units / Format Example Data
Model and number
MA200-0001 Unique identification number for the Instrument.
(MAxxx-xxxx)
Identification number assigned to each line of
Whole number 1
recorded data.
Identification number assigned to each sampling
and measurement session. This value is incremented
Whole number 1 each time a new sampling and measurement
session is started (changes from STOPPED to
SAMPLING mode).
Unique identification number for exported data file
Natural number 1 structure used when exporting data from microAeth
Manager software.
Unique identification number for firmware running on
Decimal number 1.08
instrument when measurement was recorded.
Unique identification number for microAeth Manager
Decimal number 1.03
software that was used to export data file.
Year, month, day,
Local date and time calculated from instrument's
hours, minutes,
2018-03-21T14:17:00 internal clock using Coordinated Universal Time
seconds (yyyy-MM-
(UTC) and Timezone offset.
ddTxx:xx:xx)
Timezone offset from Coordinated Universal Time
Minutes (Integer) -420
(UTC) in minutes.
Local date calculated from instrument's internal
Year, month, day
2018/03/21 clock using Coordinated Universal Time (UTC) and
(yyyy/MM/dd)
Timezone offset.
microAeth MA Series MA200, MA300, MA350 Operating Manual
®
Description
53