16 Columns and Ovenï€
Operation Manual 233
Hydrogen Sensor
The optional Hydrogen Sensor module checks for uncombusted free hydrogen in the GC
column oven. During normal operation with hydrogen as a carrier gas, leaks from the inlets or
detectors could possibly put hydrogen gas directly into the oven. Hydrogen–air mixtures are
potentially explosive in concentrations of 4–74.2% hydrogen by volume. The sensor monitors
the free hydrogen level in the oven and will trigger a shutdown of all hydrogen gas flows if the
hydrogen level in the oven is > 1%.
In the event of a hydrogen safety shutdown, the GC records the event in its Event log.
See the Troubleshooting manual for more information about GC shutdown events and how to
clear them.
The GC can only shut down hydrogen gas flows that have been configured properly. Always
configure the gas types used for the inlets, detectors, and so forth.
Instrument logs
The GC will log the following hydrogen sensor events in its event logs:
• Hydrogen safety shutdowns initiated by the hydrogen sensor
• Calibrations
• Hydrogen sensor tests
Calibration
The hydrogen sensor requires periodic calibration for optimal performance. If the sensor is not
calibrated on schedule or if a calibration fails for any reason (for example, a lack of calibration
gas), the sensor continues to use its existing calibration data.
Status information
If a calibration fails, a notification will appear on the diagnostics tab.
Operation with an Agilent data system
Using the hydrogen sensor with an Agilent data system provides additional features. Use the
data system to:
• Print calibration reports. The report includes a plot of all calibration data stored in the GC,
• Access the automated calibration schedule control (on/off).
• Store lot number and expiration date information for the calibration gas cylinder.
• View the hydrogen sensor status information in the GC status user interface. The status
shows the current percent hydrogen level and any messages related to the hydrogen
sensor.
• Plot the measured hydrogen level as a diagnostic signal, if desired.
• View and print all logged entries for calibrations, cylinder information, and shutdowns.
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