VACUUM LEAK DETECTOR VLX ../A-Ex
29/06/2018
(10) Leak detector side flame arresters:
Are necessary, when either the suction line or the exhaust line (or both) are connected
to zone 0.
Are not necessary, if both the suction line and the exhaust line are NOT connected to
zone 0.
(11) For applications with pressure-compensating vessel (see drawing L/M-01 to L/M-03):
Length of the measuring line from the pressure-compensating vessel (V=0.1 l)
:
Type 330:Lmax 8 m
For every 10 ml of the condensate trap(s) used in the measuring line between the
pressure-compensating vessel and leak detector, Lmax is reduced by 0.4 m.
Alternatively: 50 % of the overall length of the measuring line must be laid horizontally, or
with a 0.5 to 1 % gradient to the node point. Lmin = 0,5 x total length of the measuring line
(compare with L/M-01 top drawing).
(12) When using the V4A version, as a rule, stop cocks should be provided on the interstitial
space side.
4.4.1 Installation of the exhaust line
(1) The following lengths may not be exceeded for the exhaust line:
Pipe with 6 mm inside clearance: 50 m (F 501 for explosion group IIA + F 502)
If these lengths are not sufficient, the manufacturer must be consulted.
(2) The exhaust line is generally routed to the tank vent, in which case an explosion protection
device must be installed on the tank vent side.
Exceptions:
Tanks with interior overlay pressure, tanks according to DIN 4119 with double-layered floor,
or comparable:
A) The exhaust line can lead outside to a safe
area, outside of the explosion area:
Provide a condensate trap and liquid stop valve in the exhaust. The area within 1 m
diameter of the end of the exhaust is considered as having zone 1 conditions; attach a
warning sign if necessary.
B) The exhaust ends in zone 1 (e.g. remote fill chamber or collection space):
An explosion protection device
must be provided at the end of the exhaust line.
Condensate traps must be provided at low points; a liquid stop valve is not required if
the end of the exhaust is in an area which is made liquid-tight according to water
protection laws.
(3) Caution: An exhaust line which ends outdoors must not in any circumstances be used to
detect leaks (e.g. by “sniffing”). Attach warning signs if necessary.
4.4.2 Connecting several pipe interstitial spaces parallel to a leak detector via a
distributor (see L/M 02)
If this volume is multiplied, Lmax.is multiplied in the same way.
Amongst other things, not accessible to the public traffic/people
The explosion protection device is not required if the exhaust is routed so that it is frost proof, and it can be
guaranteed that the exhaust will not become kinked or clogged.
