1-4 Model 3321 Aerodynamic Particle Sizer
Spectrometer
Syste m H istory
The first APS™ spectrometer manufactured by TSI was designated the
Model 3300. It consisted of a sensor with a parallel interface to an Apple II+
computer. This sensor was the first self-contained real-time instrument to
give aerodynamic particle size in the 0.5 to 15 µm range. The sensor was
based on work done by Agarwal and Fingerson (1979), and was in
production from 1982 to 1987.
In 1987 the Model 3310 APS™ spectrometer was released. It used a serial
interface to an IBM PC. This sensor had timer improvements allowing it to
detect particles from 0.5 to 30 µm.
In 1993, the Model 3310 APS™ spectrometer received a face-lift and some
minor engineering changes. This brought the instrument up-to-date in
terms of electrical compliance and replaced obsolete parts. A new color
scheme brought the APS™ spectrometer into line with the family of TSI
scientific particle instruments.
The Model 3320 APS™ spectrometer is a complete redesign of earlier
APS™ spectrometer models and began shipping in early 1997. This
smaller, ruggedized sensor includes improvements such as: a front panel
display, solid-state laser and avalanche photodetector, automatic flow
control, barometric pressure compensation, and error reducing signal
processing. Collecting and analyzing data from the Model 3320 is possible
with the Windows
®
XP or Vista
®
(32-bit only), or Windows 7 (32 or 64-bit),
Aerosol Instrument Manager
®
software.
The Model 3321 has several slight design and significant performance
improvements over the 3320 for qualitative mass weighted distributions.
The sample eduction nozzle has been redesigned to more effectively
transport particles out of the detection region to the exhaust. This
effectively eliminates recirculating particles under most operating
conditions giving much better mass calculated distributions. The Model
3321 also has improved signal and data processing allowing more
aerodynamic size resolution in correlated mode with only slightly less pulse
height resolution than the Model 3320.
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