Mounting
ASD 531, Technical description, T 140 416 en
59 / 105
5.5.7.2
Transition to a flexible tube
The transition from rigid to flexible tube can be made in principle using any type of fitting. The parts shown in
for that purpose.
For a rigid sampling pipe made of
PVC
a
PVC threaded ring
with M20 internal thread is glued into the exit side of the fitting.
The M20 quick-release coupling is screwed into the adapter for the flexible tube.
If the rigid sampling pipe is made of
halogen-free ABS
, the procedure is identical to that for PVC. Instead of the PVC
threaded ring, however, a suitable
threaded ring made of ABS
is used.
The flexible tube is simply snapped into the quick-release coupling and snapped out of it again just as easily for maintenance
work.
Warning
Make sure the interfaces of the flexible tube are implemented “cleanly” so that the sealing ring in the quick-relea-
se coupling is not damaged.
When clicking the flexible tube into place, make sure the tube and the quick-release coupling are pressed firmly
against each other to prevent the intake of any leakage air.
For transitions from flexible tubes to sampling fixtures, proceed in the reverse order described above.
Fig. 24 Transition from fittings to flexible tube
Transition from PVC or ABS fittings to flexible tube
Sleeve
Angle or
arc
or
or
T-piece
PVC or ABS
threaded ring,
M20
M20 quick-release
coupling
Flexible tube
Ø 16/21 mm
= glued (PVC or ABS glue)
= screwed
= snapped in
1
1
2
2
3
3
