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User's manual – Ver. 1.53 July 2015 6/75
The Aethalometer Model AE33 has been developed with input from the research and
monitoring communities, and is designed for reliable operation under all conditions ranging
from state-of-the-art research to compliance monitoring.
The leading innovations incorporated into the Model AE33 include:
1. The DualSpot™ measurement method, which solves the effects common to all filter-
based real-time monitors, in which the instrumental response factor shows a dependence on
the loading of material on the filter.
2. Features for automatic ‘dynamic zero’ testing under a flow of internally-generated
clean air; ‘span’ testing of the response of the optical sources and detectors; calibration of the
response of the internal mass flow meters, if an external standard flow calibrator is connected;
and validation of the photometric response by use of a kit of ‘Neutral Density’ optical filters
whose properties may be traced to reference standards.
3. User and communications interfaces, permitting remote monitoring of operation; data
retrieval; performance of internal tests; and reporting of ‘state-of-health’ parameters.
4. Modular construction designed for ease of routine maintenance service.
In addition to the above features, the Aethalometer Model AE33 offers real-time aerosol
absorption analysis at up to ten optical wavelengths, with rapid time resolution to 1 second
even in 10-wavelength mode. This permits the measurement of optically-absorbing aerosols –
‘Black’ Carbon and ‘Brown’ Carbon components of particulate matter – in applications
including routine monitoring of ambient air quality for regulatory purposes; measurements of
the concentration of BC in urban, suburban, regional, rural and remote locations; source
testing; and laboratory-based research.
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