Maintaining the GC 3
Maintaining Your GC 25
To Change the Hydrogen Sensor Calibration Gas Cylinder
Replace the calibration gas cylinder when you cannot adjust it
to provide the correct flow rate during calibration, or if it
expires.
1 Make sure the old cylinder is empty.
2 Turn the pressure regulator completely off and set the
output pressure as low as possible (full CCW).
3 Remove the pressure regulator from the old cylinder and
install it onto the new cylinder.
4 Install the new cylinder into the stand.
5 Turn on the pressure in the new cylinder.
6 Open the GC oven door and connect a flowmeter tube to the
sensor tube in the oven.
7 Press [Options] then go to Calibration > Hydrogen Sensor and
press [Enter].
8 Scroll to Start Calibration Cycle? and press [On/Yes]. The
calibration cycle begins. The hydrogen sensor module will
wait to stabilize, then will begin to send calibration gas
across the sensor.
Connect only the Agilent calibration gas to the hydrogen sensor
fitting. The calibration gas is 2% hydrogen in air and is not
potentially explosive. Gases with higher concentrations of
hydrogen can create a dangerous condition in the oven or damage
the hydrogen sensor.
&RQQHFWWKHÁRZ
meter to the
hydrogen sensor
tube next to the
oven heater shroud
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