SGB VLR 230, Documentation, Page: 10 / 45

VACUUM LEAK DETECTOR VLR ..
2020-06-29 7
(8) Mount the liquid stop valve in the suction line (heed pressure resistance specified in 4.1).
(9) Exhaust line must lead with slope to the tank ventilation outlet. In the case of laying with
lowest points, use condensate traps.
Alternatively: The exhaust line can terminate out in the open, at a non-dangerous spot. In
this case, provide for a condensate trap and liquid stop valve in the exhaust line
7
.
(10) Conduits for connecting lines have to be sealed gas- and liquid tight at the inlet and outlet
points.
(11) For applications using a pressure compensating vessel in the measuring line, if suction and
measuring line are connected together in a node point, the following shall apply:
Per 0.1 litre volume
8
of the pressure compensating vessel, the length of the measuring line
(L
max
) may only be a maximum of
VL(R) 330 16 m 36 m
VL(R) 410 12 m 28 m
VL(R) 500 10 m 22 m
VL(R) 570 8 m 18 m
NOTE: The lower edge of the pressure compensating vessel must not be lower than the
node point, the upper edge of the pressure compensating vessel must not be more than 30
cm above the node point.
Per 10 ml of the condensate trap(s) mounted in the measuring line between pressure com-
pensating vessel and leak detector,
L
max
is reduced by :
0.5 m (6 mm clearance)
1 m (4 mm clearance).
ALTERNATIVELY: In place of the pressure compensating vessel, the measuring line can
be laid from the node point over 50% of the measuring line length (=L
min
) with approx. 1%
slope to the node point.
4.3.1 In case several interstitial spaces for pipes are connected parallel to a leak detector.
(1) Route connecting lines with slope to the interstitial space or to the manifold. In the case of
lowest points in the connecting lines with the lines routed in the open, mount condensate
traps at all the lowest points.
(2) Route the suction and measuring line with slope to the manifold. If this is not possible, use
condensate traps at all the lowest points.
(3) Connect a liquid stop valve in each of the connecting lines to the interstitial space, against
the stop direction.
These prevent leaked liquid entering the interstitial spaces of the other ducts of the double
walled pipe.
4.4. Mounting the probe (VLR ../E ONLY)
4.4.1 Probe requirements
(1) Approval as overload protection or as leak probe is required.
(2) Voltage supply identical to voltage supply of the leak detector.
(3) Current consumption of the probe P < 200 W
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Condensate trap and liquid stop valve are not required if the exhaust pipe ends above a liquid-proof
area (e.g. filling area, leak containment room).
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Multiplying this volume leads to a multiplication of L
max
. Dividing this volume leads to a division of L
max
.