BUCHI Syncor Polyvap - Manual (Page 32)

Syncore ® Accessories
30 version E
Function test
Tightness
Tightness is tested at slight gas excess pressure.
To do so, the vacuum connection must be sealed with the
SVL22 lid.
The inert gas cover (or the inert gas module in connection
with a vacuum cover) is placed onto the 24 test tubes in rack
R-24. The inert gas cover is fastened to the test tubes using
the two tightening nuts (safety screws). Gas is supplied via
a valve in a controlled manner.
The gas discharge takes place via a tube, connected with
a gas wash bottle a or a bubble counter. A slight counter
pressure forms in the gas wash bottle or bubble counter
via water b or an other liquid. The inert gas connection is
to be completely sealed by tightening the tightening screws
via the individual sealing discs c of the test tubes, visible
via gas bubble formation d at the exit in bubble counter
or gas wash bottle.
In order to prevent backflushing of the sealing liquid, con-
nect the second gas scrubbing bottle as depicted in the
figure 40.
If no tightness is achieved when the tightening nuts are
moderately tightened, the test tubes used are to be checked
for unevenness, if necessary, individual test tubes, sealing
rings or sealing washers are to be replaced and the function
test repeated.
If the problem still persists, you should notify the supplier.
Figure 38: Gas flow and bubble counter
a
b
c
d e
Function,putting into operation, operation and maintenace