|In addition to the following vacuum leak detectors for the low-pressure principle the types IIIF , V13 , V33, V80Ex H and V90 H can be used, provided the technical approval of the leak protection lining allowes the connection of a leak detector for vacuum systems with > -325 mbar alarm vacuum.
The technical approval of the container must permit expressly the connection of a suitable leak detector or in individual cases
with a certificate of the leak detector testing facility of TÜV NORD, or aptitude of the local water authority.
The requirements and conditions in the respective reports, standards and approvals of the tank or interstitial space must be observed.
This also applies to the operating limits in terms of density and viscosity of the fluid bearing.
The same applies to the operating limits mentioned in the individual building approval of the leak detector.