TSI Instruments SIZER 3321, User Manual

Page: 27 / 101

3-1
C H A P T E R 3
D e s c r i p t i o n o f t h e
A P S
™
S p e c t r o m e t e r
This chapter describes the front panel, back panel and internal
components of the Model 3321 Aerodynamic Particle Sizer
®
(APS
™)
Spectrometer.
The front panel features LEDs to provide basic on/off status for five
instrument functions and an LCD display and control knob that work
together to provide continuous real-time sampling information and access
to a menu of system functions. Through this menu you can perform initial
sample setup and view detailed instrument status.
The back panel provides power and communications connections as well
as sample exhaust outlet.
Internal components consist of the flow system, the optics system, and the
signal processing electronics.
F r o n t P a n e l
The main components of the front panel are the LCD display, the control
knob, and the five status LEDs as shown in Figure 3-1.
The LCD display is used as a local interface to the APS
™
sensor. Although
most users will want to use a computer connected to the APS
™
spectrometer to display, collect and save data, the LCD display allows the
user to change settings and display data in various formats at the sensor
itself.