SSi Manual 4559
Page 6 of 26
3-Gas Analyzer PGA3500
Revision Level - D
Basic Operating Description
The Model PGA 3500 has been designed for the simultaneous analysis of CO, CO2 and CH4 in
heat-treat furnace atmosphere gases. It has a 16 line by 40-character LCD display and a 4 x
4 keypad for the operator interface. Information is presented to the operator on various
screens. The operator selects the appropriate page and enters the number using the keypad.
Keypad Assignments
All of the functions of the PGA3500 are controlled from the keypad. The functions of each
button are as follows:
0 – 9 are used to enter numeric data that
can vary with each page.
“.” is used to enter a decimal point where
necessary for data entry.
Enter is used when entering numeric data
from the keypad or initiating automatic
functions.
and
are used to navigate through the
menu options or scroll through data on a
specific page.
Esc is the escape key. This clears any entered text, and if continuously pressed toggles
between the main page and the menu list.
On most pages, this key can be used to turn the pump on and off (without using Screen
4). On some screens it is used to change a selection or view additional data.
Analyzer Start-Up Procedure
Turn the power switch ON and allow the instrument to warm up until numbers appear on the
default screen instead of ********. This process should take approximately three minutes.
During this time, the user will be prevented from accessing the calibration screens since the
sensors have not had enough time to provide accurate data. It is recommended that the
instrument is powered on for four or five minutes prior to use, although measurements can
be taken within only three.
Sampling Criteria
Accurate readings are only possible if the sample is taken from a clean (free of excess carbon
buildup) sample port. The current state-of-the-art technology associated with infrared gas
detection requires that a clean, soot free sample be available for analysis. This will also
increase the life of the filter elements, and reduce the possibility that soot will enter the unit
and contaminate the sensors.
1
2
3
4
5
6
ENTER
7
8
9
ESC.
0