34 • Measuring Mode, Normal Operation
EAGLE 2 Operator’s Manual
Using Optional Sample Hoses
The standard sample hose for the EAGLE 2 is 5 feet long. Optional hoses are available up
to 125 feet long. If you are considering using a longer hose, keep in mind that a longer
hose will increase the EAGLE 2’s response time and the flowrate may decrease close to
the low flow alarm point.
CAUTION:
Sample hose lengths of more than 125 feet are not recommended for the
EAGLE 2 because of flow rate reduction and increased response time.
Consult RKI Instruments, Inc. for hose lengths longer than 125 feet.
The chart below illustrates how response time is affected by the sample hose length.
Using Exhaust Tubing
The EAGLE 2’s exhaust fitting has a female 10-32 thread to allow for the installation of a
hose barb fitting with a 10-32 thread to which a flexible exhaust tube can be connected. If
you utilize this feature, the tubing used must have a minimum internal diameter of 1/8
inch. RKI Instruments, Inc. recommends using flexible polyurethane tubing with a
maximum exhaust tube length of 20 feet. Consult RKI Instruments, Inc. for exhaust tubing
lengths longer than 20 feet.
Combustible Gas Detection
There are three issues to keep in mind when monitoring for combustible gas.
•
The catalytic combustible sensor will respond to any combustible gas. The standard
calibration gas for the EAGLE 2 catalytic combustible channel is methane (CH
4
). If
the instrument is calibrated to a different combustible gas, such as hexane or propane,
the gas name for the catalytic combustible channel will reflect the target gas.
The table below lists the conversion factors for several hydrocarbon gases
if the
EAGLE 2 is calibrated to methane
. To use this table, multiply the display reading on
the combustible gas channel by the factor in the appropriate row to obtain the actual
gas concentration. For example, if you are detecting pentane and the display reads 10%
LEL for the catalytic combustible channel, you actually have 10% LEL x 1.95 = 19.5%
LEL pentane present.
Table 4: EAGLE 2 Response Time vs. Sample Hose Length
Hose Used
Typical Time to 90%
of Response (T90)
Probe Only
12 seconds
Probe & 5 Foot Hose
15 seconds
Probe & 25 Foot Hose
25 seconds
Probe & 50 Foot Hose
35 seconds
Probe & 75 Foot Hose
45 seconds
Probe & 100 Foot Hose
60 seconds
Probe & 125 Foot Hose
75 seconds
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