31 • Measuring Mode, Normal Operation GX-6000 Operator’s Manual
Using Optional Sample Hoses
The standard sample hose for the GX-6000 is 3 feet long. Optional samples
hoses and probes with longer hoses are available from 5 - 50 feet in 5 foot
increments (see “General Parts List” on page 137). If you are considering
using a hose and probe with a longer hose, keep in mind that a longer hose
will increase the GX-6000’s response time and the flowrate may decrease
close to the low flow alarm point.
CAUTION: Sample hose lengths of more than 50 feet are not recommended
for the GX-6000 because of flow rate reduction and increased
response time. Consult RKI Instruments, Inc. for hose lengths
longer than 50 feet.
The chart below illustrates how response time is affected by the sample hose
length.
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 GX-6000 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 GX-6000 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 1.56 = 15.6% LEL
pentane present.
Table 4: GX-6000 Response Time vs. Sample Hose Length
Hose Used
Typical Time to 90%
of Response (T90)
Probe & 3 Foot Hose (standard) 10 seconds
Probe & 10 Foot Hose 15 seconds
Probe & 30 Foot Hose 30 seconds
Probe & 50 Foot Hose 40 seconds
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