28/07/2020
VACUUM LEAK DETECTOR
VLXE .. Ex M and VLXE .. Ex MMV
- 19 -
a liquid stop valve is not required if the end of the exhaust is in
an area which is made liquid-tight (e.g. with collecting area).
-
Caution:
An exhaust line which ends outdoors must not in any cir-
cumstances be used to detect leaks (e.g., by “sniffing”). Attach
warning signs if necessary.
5.3.3 Several pipelines interstitial spaces are connected in parallels
- Lay connection lines at a downward angle to the interstitial space
or the manifold. If there are low points in the connection lines and
lines are laid out of doors as well install condensate traps at all low
points!
- Lay suction and measuring lines at a downward angle to the mani-
fold. If this is not possible, place condensate traps at all low points.
- Connect a liquid stop valve to each connection line to the intersti-
tial space, against the valve direction.
This prevents leaking liquids from entering the interstitial spaces of
the other pipelines.
- If stop valves are installed in the connection line shut-off cocks,
then they should be sealable in open position.
- For applications with pressure compensation vessel (see 5.7.4 and
5.7.5):
Length of the measuring line from the pressure compensation ves-
sel (V=0.1 l)
8
:
Type 230…330:
L
max
16 m
Type
410
L
max
12 m
Type
500
L
max
10 m
Type
570
L
max
8 m
CAUTION:
The bottom edge of the pressure compensation vessel
must not be lower than the node point; the upper edge of the pres-
sure compensation vessel must not end more than 30 cm above
the node point.
For each 10 ml of the condensate trap(s) used in the measuring
line between the pressure compensation vessel and leak detector,
L
max
is reduced
by 0.5 m
- OR (alternatively to the pressure compensation vessel) 50% of the
overall length of the measuring line must be laid with a 0.5 to 1%
gradient to the node point. L
min
= 0.5 x total length of the measur-
ing line.
5.3.4 Several pipeline interstitial spaces are connected in parallel
The liquid stop valves installed against the direction of flow (27*) pre-
vent that the other interstitial spaces become filled with liquid in case
of a leak in a pipeline. The interstitial space volumes of the connected
pipes must meet the following conditions:
3
∙
V
ÜR 1
> V
ÜR 1
+ V
ÜR 2
+ V
ÜR 3
+ V
ÜR 4
and
3
∙
V
ÜR 2
> V
ÜR 2
+ V
ÜR 3
+ V
ÜR 4
etc.
V
ÜR (number)
is the volume of the respective interstitial space. No. 1 is
the interstitial space the suction line is connected to (see 5.7.6)
8
If this volume is multiplied, L
max
. is multiplied in the same way.
Mounting
Summary of Contents for VLXE Ex M Series
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