RKI Instruments EAGLE 2 Manual - Manual (Page 45)

EAGLE 2 Operator’s Manual Measuring Mode, Alarms • 35
The %LEL and %volume unit readings will still increase up to 100% LEL
and 15 %volume respectively, which are equivalent to 150,000 ppm.
The catalytic combustible sensor is slightly affected by humidity. This is not
apparent when the EAGLE 2 is used for %LEL or %volume detection, but
because of the high sensitivity in the ppm range, significant humidity
changes can affect the ppm reading, especially in the lower part of the range.
Take care to allow the unit to acclimate to a new environment for about a
minute and perform a demand zero in a fresh air location when you move
between areas of different humidity.
CAUTION: If the catalytic combustible channel is being calibrated with a
gas concentration of 1000 ppm or lower, the a 24 inch
humidifier must be used for accurate calibration. See “Chapter
4: Calibration Mode” on page 55 for more explanation and
instructions for calibration.
To monitor for combustible gas in the ppm range:
1. Start up the EAGLE 2 as described in “Start Up” on page 22.
2. Allow the EAGLE 2 to run for 3 - 5 minutes after the startup sequence is
complete and it is in Measuring Mode. This allows the catalytic
combustible sensor to stabilize sufficiently for ppm monitoring.
NOTE: This extra stabilization period is not necessary if monitoring in the
%LEL or %volume range.
3. Set the catalytic combustible channel’s units to be ppm by using the
RANGE ▼ SHIFT button.
4. Perform a demand zero as described in “Performing a Demand Zero” on
page 27.
5. Proceed to monitor for gas as described in “Monitoring an Area” on
page 30.
Measuring Mode, Alarms
This section covers alarm indications in Measuring Mode. It also describes
how to reset the EAGLE 2 after an alarm has occurred and how to respond to
an alarm condition.
NOTE: False alarms may be caused by radio frequency (RF) or
electromagnetic (EMI) interference. Keep the EAGLE 2 away from
RF and EMI sources such as radio transmitters or large motors.