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2-6
GENERAL INFORMATION FIRST RESPONDER CG - USER HANDBOOK
Oxygen, 0 – 25%
(CSM and PURGE modes only)
This range displays the percentage Oxygen content of the
sample. The instrument range is displayed in the top right
corner of the LCD. The digital display resolves the signal to
0.1% O
2
from 0 to 21%, and 1% O
2
from 21% to 25%. The
analogue bar graph follows in 4% steps. Figure 2-7 illustrates
the Oxygen display.
The gas level is determined using an electrochemical cell,
which like toxic sensors is sensitive to pressure transients.
The oxygen cell has an expected life of two years.
Fig. 2-7 Oxygen Range