1. Object
Vacuum leak detector of the type VLR ..(dots stand for alarm vacuum) as part of a leak detec-
tion system in the following versions:
a) VLR ..
b) VLR .. /E (extended version, i.e. either a leak probe or solenoid valve or both can be con-
nected in addition)
Leak probe: Either in place of the liquid stop valve if special installation conditions or
resistancy matters make it necessary or as a probe used separately (e.g.
in the leakage containment).
Solenoid valves: Must be used whenever tanks are operated at more than 5 bar overlay
pressure or if resistancy requirements make them necessary (system is
then executed resistant up to the solenoid valves).
2. Area of application
2.1. Interstitial space requirements
• Vacuum resistance to the operating vacuum of the leak detector, also taking fluctuations in
temperature into account.
• Assurance of the suitability of the interstitial space as part of a leak detection system (e.g.
DIN standards, proofs of usability issued by the building inspection authorities, determina-
tion of suitability etc.)
• No leak detection liquid in the interstitial space (see App. A if this is nevertheless the case)
• The pipes listed under section 2.4 meet the above requirements acc. to App.E.
• The volume of the space monitored by the leak detector may not exceed 8 m
3
for tanks and
10 m
3
for pipes. The manufacturer recommends not exceeding 4 m
3
.
2.2. Material to be conveyed
Liquids hazardous to water with a flash point > 60°C (for Germany > 55°C acc. TRGS 509 and
751), where no potentially explosive vapour-air mixtures occur.
If different liquids are conveyed in individual pipes and monitored with one leak detector, these
liquids may not have a negative influence on one another nor lead to chemical reactions.
2.3. Resistance / materials
For the leak detector VLR .. the material polyamide (PA) in connection with brass (MS-58) or
(1.4301, 1.4306, 1.4541)
, as well as the material of the connecting tubes used has
to be sufficiently resistant to the material to be stored/conveyed.
If the materials mentioned above are not sufficiently resistant, correspondingly resistant sole-
noid valves can be used in the tanks.
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