7-5
Ver.1.36
If the remedies mentioned above do not work, the gas leak may be due to a damaged quartz
pyrolysis tube.
Remove the tube from the pyrolyzer and inspect it for damage; replace it with a new one if
damage is observed (quartz pyrolysis tube, P/N: PY1-3018A)
(2)
Checking clogging of ITF needle
If no gas leakage is found, check to see if the ITF needle may be clogged.
Set the carrier gas total
flow to 100 mL/min and the column flow rate to 1 mL/min, and make sure that the readings are equal
to the set values. If the actual flows are equal to the set values and the problem persists, the ITF
needle opening may be clogged with septum or sample residues. If this is the case, the symptoms
shown below will be observed. After addressing the needle clogging, loosen the septum cap nut a bit,
and then repeat the leak check.
・
When the sampler is removed, the injector pressure drops very slowly or does not drop.
It should
drop to zero in 1 to 2 seconds.
・
The carrier gas total flow is unstable and eventually goes to zero.
・
When the sampler is removed from the pyrolyzer a gas releasing sound is heard.
If your problem persists contact your nearest sales office or Frontier Laboratories:
Fig. 7.1 Checking gas leakage
Graphite Vespel
ferrule
Pyrolysis tube
ITF union
Metal ferrule
ITF needle
Nut
c. Liquid sampler
b.
ITF union
O-ring (2 pcs.)
Quartz pyrolysis tube
a. Three screws at
sampler base
