RKI Instruments GP-01 - Manual (Page 17)

Model GP-01 Operator’s Manual Operation • 12
• The GP-01 provides the combustible sensor with some protection
against exposure to high levels of combustible gas. It does this by
turning off the sensor power temporarily when it determines that an
over scale (more than 100% LEL) concentration of combustible gas is
present that may damage the sensor. Nevertheless, concentrations of
combustible gas of more than 100% LEL can still affect the zero level or
calibration of the combustible sensor if the concentration is high
enough.
CAUTION: Do not expose the combustible sensor to high concentrations
of combustible gas such as that from a butane lighter.
Exposure to high concentrations of combustible gas may
adversely affect the performance of the sensor.
• The H
2
S scrubber disks are not normally installed in the GP-01 as
shipped from the factory. If H
2
S is present in the monitoring area, the
H
2
S scrubber disks should be installed to protect the sensor from H
2
S
exposure. However, if the H
2
S scrubber disks are used, then response
to solvent gases such as IPA, toluene, or styrene will be slowed and
decreased. If the GP-01 is to be used for solvent gas applications, do
not install the H
2
S scrubber disks.
Table 3: LEL Hydrocarbon Conversions
Gas
LEL Conversion
Factor (Methane
Calibration)
Gas
LEL Conversion
Factor (Methane
Calibration)
Acetone 1.92 Iso Butane 1.56
Acetylene 2.00 MEK 1.92
Benzene 2.00 Methane 1.00
Ethane 1.25 Methanol 1.65
Ethanol 1.75 Pentane 1.35
Ethylene 1.20 Propane 1.52
Heptane 1.92 Propylene 1.33
Hexane 1.65 Toluene 2.00
Hydrogen 1.00 Xylene 2.00
IPA 2.50