Additional Refill Information - Agilent Technologies 490 Micro GC Field Casen User Manual

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Installation and Use
N O T E

Additional refill information

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When the Refill Assembly has been sufficiently purged,
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tighten the Fill 1(2) nut.
7 While watching the pressure gauge on the Refill Assembly,
slightly open the refill valve. When the pressure on the
gauge reads 10,000 to 12,000 kPa, close both valves on the
Refill Assembly and the gas supply cylinder.
It is possible that the relief valve may have started to blow,
this is normal. The relief valve is meant to limit the pressure
in the carrier gas cylinder.
Disconnect the 1/8 inch tube from Fill 1(2). Now escaping gas
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comes from the Refill Assembly letting off pressure. Cap off
the Fill 1(2) port.
The carrier gas cylinder can only be filled to the maximum when the
pressure in the gas supply cylinder has sufficient pressure to allow that. If
the gas supply pressure has dropped below the set point of the relief valve,
the gauge on the refill assembly will indicate this pressure when both
valves are open.
In case the carrier supply tank depressurized completely and is
possibly contaminated with air:
Install the Refill Assembly onto the gas supply cylinder.
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Check and ensure that the valve on the Refill Assembly is
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closed.
Close Valve 1(2).
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At the back of the Field Case, disconnect the tubing
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connecting the Carrier 1(2) and Carrier gas 1(2).
At the front of the Field Case, remove the 1/8 inch nut at
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Fill 1(2).
Connect the 1/8 inch tube from the Refill Assembly to
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Fill 1(2) port on the front panel. Finger-tighten and loosen
the nut 1/4 turn.
First open the valve on the gas supply cylinder, then slightly
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open valve on the Refill Assembly just a little and listen for
gas leaking through the nut. (This purges the Refill
Assembly so that no air enters the carrier gas cylinder).
8 When the Refill Assembly has been sufficiently purged,
tighten the Fill 1(2) nut.
Fill the carrier gas cylinder to about 1,500 kPa.
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490 Micro GC Field Case User Manual