SRA IST16, Руководство пользователя

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IST16 User manual – Version 8.0
SRA INSTRUMENTS
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RCS Lyon B 342 068 731
APE 4669B
SIRET : 342 068 731 00054
Code TVA FR 40342068731
p. 46 / 59
11.3 Problem of memory effect
Memory effect comes from the IST16 transfer line and
loops, or from the TGA oven.
Check the condition of the union and Teflon® tube; change
them if necessary.
Disconnect the IST16 from the TGA. Connect your reactive
gas directly to the IST16 without passing through the TGA.
Run storage and analysis with 3 to 16 loops.
Clean the TGA oven with a dedicated method.
If the memory effect is constant or
increases, most of the time it comes from
the IST16 transfer line.
Clean it with a solvent.
Run storage and analysis again.
If there is really a significant contamination,
it is possible to change a loop or the
transfer line.
If the memory effect decreases run after
run , it means that the problem comes from
the TGA oven.
Run some blanks and storages with an
empty crucible using your current TGA
method.
11.4 Problem of high level of air in MS
Lower the temperature of the GC injector to 50 °C.
Disconnect the transfer line from the IST16 and turn the
3-way valve to let the carrier gas flow directly into the GC.
Wait 5 minutes and check the air level in the MS again.
Is it still high?
The problem comes from the IST16
Refer to the leak test procedure:
No flow in GC
No pressure in GC
GC can’t hold the pressure set-point
(§ 11.1)
The problem comes from the GC
inlet, column, MS connection or
carrier gas quality.
Check all these elements, change
the septum.
Contact your GC support company if
needed.
NO
YES