36 • Measuring Mode, Normal Operation
EAGLE 2 Operator’s Manual
•
Some gases such as silicone vapors, chlorinated hydrocarbons, and sulphur
compounds can contaminate the detection elements inside the combustible sensor
damaging the sensor and result in reduced response to combustible gas. Make every
effort to avoid these gases. The catalytic combustible sensor has an integral H
2
S
scrubber for protection from H
2
S exposure resulting from normal use, but you should
avoid exposure to high levels of H
2
S and other sulphur compounds.
Monitoring Combustible Gas in the PPM or %Volume Range
The standard factory configuration for the EAGLE 2 allows the user to use the RANGE
▼
SHIFT button to change the displayed detection units of the catalytic combustible channel
between %LEL, ppm, and %volume. It is possible to disable this capability and set the
EAGLE 2 to display only one of the detection units by using the Catalytic Units menu
item in Setup Mode. See “Setting the Catalytic Detection Units” on page 105 for
instructions to set this Setup Mode Menu item.
The detection range of the combustible catalytic channel when set for ppm or %volume
will correspond to 0 - 100% LEL for the configured gas. For example, the LEL for
methane (CH
4
) is 5% volume, or 50,000 ppm. So if the catalytic combustible channel is
displayed in terms of %volume, the full scale is 5.00% and if it is displayed in terms of
ppm, the full scale is 50,000 ppm.
If the Catalytic Units menu item in Setup Mode is set to
CHANGE OK
, the standard
factory setting, then you can change the catalytic combustible channel’s units by pressing
and releasing RANGE
▼
SHIFT.
CH4 0%LEL
OXY 20.9vol%
H2S 0.0ppm
CO 0ppm
CH4 0.00vol%
OXY 20.9vol%
H2S 0.0ppm
CO 0ppm
RANGE
SHIFT
CH4 0ppm
OXY 20.9vol%
H2S 0.0ppm
CO 0ppm
RANGE
SHIFT
RANGE
SHIFT
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