GX-6000 Operator’s Manual
Appendix G: Infrared Sensors • 201
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 25, “Measuring Mode, Normal Operation” on
page 35, and “Measuring Mode, Alarms” on page 41.
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.147 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 25, “Measuring Mode, Normal Operation” on page 35, and
“Measuring Mode, Alarms” on page 41.
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.147 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.