GX-6000 Operator’s Manual IR HC Start Up and Normal Operation • 196
IR HC Start Up and Normal Operation
For instructions to startup and use a GX-6000 that includes an infrared
hydrocarbon sensor, reference “Start Up” on page 19, “Measuring Mode,
Normal Operation” on page 29, and “Measuring Mode, Alarms” on page 36.
0-100 %LEL/2.0-30.0 %vol Autoranging
The infrared hydrocarbon sensor can be factory set to detect gas in a 0-100
%LEL configuration or an autoranging configuration. The autoranging
configuration detects gas on a 0-100 %LEL and a 2.0-30.0 %vol scale. The
gas reading will be displayed in %LEL until the gas level reaches 100 %LEL,
or 2.0 %vol for isobutane. Once the gas reading is above 100 %LEL, it is
displayed in %vol. Alarm points exist for the %LEL range but do not exist
for the %vol range. If %LEL range alarms are not silenced (see pg.159 for a
description of the alarm silence feature) and the gas level increases to %vol
levels, the alarms will continue to sound but no new alarms will occur.
• If a CO sensor is installed and its charcoal filter becomes saturated, the
presence of hydrocarbons may produce a reading on the CO channel.
• If a PID sensor is installed in your instrument, the presence of
hydrocarbons that the IR HC sensor is intended to detect may produce
upscale readings on the PID channel.
IR CH
4
Start Up and Normal Operation
For instructions to startup and use a GX-6000 that includes an infrared
methane sensor, reference “Start Up” on page 19, “Measuring Mode, Normal
Operation” on page 29, and “Measuring Mode, Alarms” on page 36.
0 - 100 %LEL/5.0 - 100.0 %vol Autoranging
The infrared methane sensor can be factory set to detect gas in a 0-100 %LEL
configuration or an autoranging configuration. The autoranging
configuration detects gas on a 0-100 %LEL and a 5.0-100.0 %vol scale. The
gas reading will be displayed in %LEL until the gas level reaches 100 %LEL,
or 5.0 %vol for methane. Once the gas reading is above 100 %LEL, it is
displayed in %vol. Alarm points exist for the %LEL range but do not exist
for the %vol range. If %LEL range alarms are not silenced (see pg.159 for a
description of the alarm silence feature) and the gas level increases to %vol
levels, the alarms will continue to sound but no new alarms will occur.
• If a PID sensor is installed in your instrument and concentrations of
methane greater than 100 %LEL are present in the monitoring
environment, the PID channel’s reading will be suppressed.
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