Operating TOPwave
42
6.3.2 Handling of pressure vessels QX 20 / QX 22
CAUTION
Rupture discs and pressure vessels!
Observe the safety instructions in the sections "
Safety instructions" p. 8 and "Performing
" p. 33.
Never use more than one rupture disc per vessel!
-tighten the quartz glass lids. Excessive tightening can destroy the vessels!
CAUTION
Observe maximum sample quantity!
The maximum sample quantity dep
ends on the vessel type
see section "Technical Data" p. 71).
Observe minimum fill amount!
In each pressure vessel, at least approx. 7 ml of liquid sho
uld be employed so that the
temperature sensor can determine the sample temperature precisely.
The microwave oven requires a certain minimum load of approx. 20 ml of liquid. If lower
volumes of liquid must be used, at least 3 vessels must be used for each
run in order to
achieve the required total load.
If the fluid amount employed is too small, the oven may be damaged during longer ope-
ration! An inadequate liquid load can also result in rotor overheating and, in the worst
case, in rotor damage.
The procedure for the quartz glass inserts QX 20/QX 22 with pressure vessels PM 60/PL
100 is largely identical to the procedure for pressure vessels without quartz glass inserts.
Only the changes in the steps of the procedure are therefore described here.
Visually inspect the rupture disc. In case of extensive traces of corrosion or other vi-
sible damage to the rupture disc, it must be replaced for safety reasons. A bulge in
the center of the rupture disc after use is normal and will not affect its functions.
After weighing in sample and adding acid pull the cent-ring sleeve over the quartz
vessel.
Seal the vessel using the TFM locking lid. When pressing on the lid clear resistance
must be felt. If this is not the case, the sealing lip must again be expanded as descri-
bed above (see section "Handling of PM 40, PM 60 and PL 100 Pressure Vessels" p.
38).
Place the rupture disc onto the rupture disc holder. Place both onto the TFM locking
lid.
Insert the closed quartz vessel QX 20 / QX 22 into the pressure vessel PM 60 / PL
100.
Assembling and locking
vessels
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