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Problems when starting evacuation
5. No ready status after automatic start
Check the GC settings.
□ Is an appropriate carrier gas pressure set at the GC?
An inappropriate carrier gas supply can result in no pressure increase at the column
inlet, so that the automatic startup sequence does not begin (and the rotary pump
does not operate). Check that the set carrier gas conditions are suitable for the
column.
Check the rotary pump.
□ Is the rotary pump rotating?
If not, check the wiring.
If the wiring is correct, see section 4.4 Main Power Assy.
Check for leaks.
□ Is the unit front door completely closed?
Occasionally, dust can cause minute leaks. Check that no dust is sticking to the
O-ring contact faces before closing the front door.
□ Is there any leakage from the interface column connector?
Leakage can occur from the interface unit after repeated analysis with heating.
Tighten the connector slightly (about 1/6 turn).
Caution: Fully tightening the connector with the wrench supplied could damage the
screw threads. If slight re-tightening does not stop the leakage, replace the ferrule.
□ Is the column broken?
It is impossible to maintain a vacuum if the column breaks near the interface unit. If
the column is scratched during maintenance, it tends to break at the scratch.
□ If the analysis tube was opened during maintenance, is there any leakage from it?
If a normal vacuum could be maintained before maintenance but not after it, initially
check the positions where maintenance work were conducted and the interface
column connector (the temperature has been dropped).
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