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A vacuum (underpressure) is generated in the interstitial space.
Untightnesses lead to a vacuum loss, which can be compensated to a small extent by integrated pumps to ensure trouble-free operation.
Relevant leaks lead reliably to an optical and acoustic alarm.
The tank design, the height of the tank and the density of the stored goods determine the underpressure to be applied.
Minimum alarm pressure = 30 mbar + tank height (cm) * density (g/cm3) * 0,98
(for underground tanks: density at least 1 g/cm3)
(for flat bottom tanks: minimum alarm pressure 255 mbar)
calculation of minimum alarm pressure (excel-file).
The alarm pressure is given in mbar in the type designation, e.g. VLXE 330.
The operating pressures are higher than the respective alarm pressures. The tank's interstitial space must withstand these underpressures.
Ex vacuum leak detectors VLX .. can monitor liquids that form explosive vapor-air mixtures.
There are differences in the categories of the construction groups and their installation inside or outside of Ex areas as well as in the version without or with an integrated pump.
Internally partially explosion-proof, with integrated pump, for one tank, for wall mounting, outside of Ex areas, preferably outdoors.
VLX .. A-Ex with LAE
Explosion-proof working unit (leak detector) with integrated pump, category 2, for one tank, for wall mounting outdoors,
in zone 1, leak indicating unit LAE for wall mounting indoors, outside of Ex areas.
VLX .. Ex
Fully explosion-proof version with integrated pump, category 2, for one tank, for wall mounting outdoors, in zone 1.
Leak detection technology combined for a maximum of 12 tanks or pipes in a free-standing housing for outdoor installation with
central pumps for the tank and/or pipe monitoring. Category 2 up to the ventilation level at 1 meter above the floor.
The solution for filling stations whose tanks or pipes cannot withstand overpressure in the interstitial space.
VLX 350 SA-Ex with LAE
Without integrated pump, category 2, for one tank, installation of the leak detector VLX 350 SA-Ex on the tank in zone 1, leak indicating unit LAE for wall mounting indoors, outside of Ex areas.
VLX-S 350 M with LAE
Without integrated pump, category 2, installation of 1–6 leak detectors in the immediate vicinity of the tank in zone 1, leak indicating unit LAE for 1, 3, 4, 5 and 6 detectors for wall mounting indoors, outside of Ex areas.
Installation of 1–32 explosion-proof sensors (category 2) in the immediate vicinity of the monitoring chambers in zone 1, with separate central Ex vacuum sources, leak indicating unit LAE for wall mounting indoors, outside of Ex areas.
The discriminating sensors indicate whether there is an air leak or petrol/diesel if there is a leak in the inner wall or groundwater if there is a leak in the outer wall.
> The requirements of the respective documentation must be observed!
> Adequate ventilation must be provided when installing Ex components in the building.
> Equipment that can come into contact with stored goods or their vapors must be made sufficiently durable.