34 • Measuring Mode, Normal Operation EAGLE 2 Operator’s Manual
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.
Monitoring Combustible Gas in the PPM Range
There are special considerations that must be taken into account when
monitoring combustible gas in the ppm range with the catalytic combustible
channel. Because of the high sensitivity in the lower part of the ppm range,
the catalytic combustible channel needs more time than the warm-up period
to stabilize after the EAGLE 2 is turned on if it is going to be used for ppm
level detection. The reading increments in the ppm range are smallest in the
lower part of the range and increase as the reading increases as follows:
• 5 ppm increments from 0 ppm to 200 ppm
• 10 ppm increments from 200 ppm to 1,000 ppm
• 50 ppm increments from 1,000 ppm to 10,000 ppm
• 250 ppm increments from 10,000 ppm to 50,000 ppm
If the catalytic combustible channel is configured for the user defined gas in
Setup Mode (see “Configuring the Combustible Gas” on page 109), the ppm
ratio defined for the gas must be considered. For example, if the ppm ratio is
set higher than 50,000 ppm, then when the display units are set as ppm, the
reading will not go above 50,000 ppm which is equivalent to 33 % LEL and 5
%volume. So if the gas reading is higher than 50,000 ppm, the ppm unit
reading will indicate 50,000 ppm and also indicate an overscale condition.
CH4 0%LEL
OXY 20.9vol%
H2S 0.0ppm
CO 0ppm
CH4 0.00vol%
OXY 20.9vol%
H2S 0.0ppm
CO 0ppm
CH4 0ppm
OXY 20.9vol%
H2S 0.0ppm
CO 0ppm
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