SSi Manual 4559
Page 12 of 26
3-Gas Analyzer PGA3500
Revision Level - D
large changes in CO Factor or Process Factor should be verified by shim stock analysis or
other means to confirm the significance of the change.
Combustion Display – Menu Page 3
The combustion display shows the current
reading in % excess oxygen. Also shown is
the relative flow rate of the sample by a fuel
gauge on the left-hand side of the screen.
The sample pump may be turned on or off
by pressing the circular arrow key.
This screen is not intended to measure
oxygen as accurately as a probe. It is
intended only to serve as a method of
checking to see if there is oxygen
contamination in the sample. This sensor
measures oxygen to a tenth of a percent,
where a probe will provide accuracy in the
parts per million.
Pump Control - Menu Page 4
The pump control page is used to set the pump
mode. The sample pump mode can be changed from
OFF to ON to AUTO by pressing the circular arrow
key. Auto mode will turn the pump on when the flow
is below approximately 1.5 SCFH and off when it is
above approximately 1.5 SCFH. Also shown is the
relative flow rate of the sample by a fuel gauge on
the left-hand side of the screen. There is also a
traditional flow meter located in the lid of the PGA.
Although the flow indicator on the screen has been
calibrated at the factory, the most accurate flow
measurements should be taken with the flow meter
inside the lid.
Set Display Values – Menu Page 5
This page is used to adjust the display values.
The backlight brightness and contrast are
factory set to 51%, which should be
appropriate for most viewing conditions. Their
values can range from 0 to 100% if desired.
Also shown on this page is the Backlight ON
Time. This is a power saving feature that will
enhance battery life by turning the backlight
off if no buttons are pressed within a pre-
determined number of minutes. When it turns