12 Injection Port
12.3 Removing and inserting the glass insert
119
GC-2010 Plus
(12) Wait five minutes. Confirm that the inlet pressure is 125 and 175 kPa.
If the inlet pressure is above 175 kPa, loosen the column nut slightly to reduce the pres-
sure.
If the inlet pressure is below 125 kPa, increase the pressure from the gas cylinder
slightly.
(13) Verify that the total flow is less than 2 ml/min. If the flow is above 2 ml/min, a leak exists.
(14) Press [On/Off] (PF menu) on the [FLOW] key screen to stop AFC control.
(15) In case of fluoride rubber O-ring, verify that the pressures does not drop more than
215 kPa in one hour or 2.5 kPa in 10 minutes.
In case of graphite O-ring, verify that the pressure does not drop more than 21 kPa in
one hour or 3.5 kPa in 10 minutes.
If it does, a leak exists.
(16) If there are no leaks, restore the connections and operational status of the GC-2010 Plus.
Q Resolving leaks
If the leak test procedure reveals the presence of an injection port leak, use the following
procedure to resolve the problem.
Use Snoop or a similar leak detection fluid to check the column connection for leaks. Tighten
the connections at the septum nut, injection port nut, split and purge vents (if the blank nuts
are inplace for the leak test), and gas supply tubing.
NOTE Take precautions when using Snoop or similar soap solution not to drip onto electronic parts or wiring.
This could cause an electric shock. In some sensitive analyses, Snoop can interfere with proper detec-
tion. In those situations, use an electronic leak detector.
If a leak is found, replace the offending part.
Leaking part Replacement
Near septum nut Replace septum
Around injection port nut Tighten the glass insert nut
Replace glass insert O-ring
At column connection Replace graphite ferrule and column nut
At split or purge vent (during leak test) Replace blank nut
CAUTION
Do not use the leak detecting fluid nor soapy water for gas leak check
on the connections above the carrier and detector gas controllers
(AFC/APC).
The drips may damage the controller.
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