TSI Incorporated 8587A, Operation And Service Manual

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3-1
C H A P T E R 3
T e c h n i c a l D e s c r i p t i o n
This chapter identifies the basic features of your Model 8587A Laser
Photometer and provides general technical information. Detailed
instrument specifications are provided in
Appendix A .
C a b i n e t
Cabinet dimensions (WDH): 17.8 cm

33.0 cm

25.4 cm
(7 in.

13 in.

10 in.)
Cabinet weight: 5.5 kg (12 lb.)
F r o n t P a n e l
Front panel features include a 2-line liquid crystal display (LCD), a 3-button
membrane keypad and instrument status lights. The display presents the
photometer signal voltage and indicates the current operation mode, i.e.,
UPSTREAM, PURGE, DOWNSTREAM.
The keypad control buttons are found under the display and are used to
select the sampling mode indicated on the button face, UPSTREAM,
DOWNSTREAM, and PURGE. When sampling upstream or downstream,
the instrument draws sample from the respective sample port at the back
of the Laser Photometer (see the following section). When the photometer
is in the PURGE mode, particle free air is drawn at a high airflow rate into
the photometer
’s laser optics chamber and through the purge air filter
shown in the schematic of Figure 3-3.
Keypad and LCD Display
The keypad enables manual switching for sampling from the different
sample ports (UPSTREAM and DOWNSTREAM) and to place the
instrument in a PURGE mode. The keypad buttons are labeled as to
function, UPSTREAM, UPSTREAM, and PURGE.
Note: When switching between UPSTREAM and DOWNSTREAM it is
necessary to pass through the PURGE mode by pressing the
PURGE keypad button.