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Limit switches

Limit switches are safety devices within the meaning of water legislation, installed in tank vehicles and acting together with overfill prevention devices to interrupt the filling operation before the maximum permitted filling level in the tank has been reached. Limits switches are special types of overfill prevention devices. They are primarily installed in heating oil and fuel tanks.

Regulatory framework

DIBt grants national technical approvals (abZ) for limit switches not covered by the harmonised standard DIN EN 13616, usually in combination with a general construction technique permit (aBG) for the application.

The national technical approvals/general construction technique permits for these construction products and techniques confirm that both the construction and the water law requirements have been met. The products and construction techniques are thus deemed to be suitable in accordance with Section 63 of the Water Resources Act (WHG).

National procedure

To prepare an abZ/aBG for your construction product, we need an application from you. We recommend that you contact us prior to doing so. Feel free to send us your enquiry informally via email to dibt(at)dibt(.)de or to the competent technical contact listed in the top right.

For a first assessment, please send us the following information:

  • Description of the construction product and its intended field of use
    • e.g. material, configuration, number of sizes, variants, dimensions
    • e.g. use in walls, ceilings, interior construction, building services
  • Description of the construction technique and its field of application
    • e.g. design of walls, ceilings, elements, etc., and interaction of components
    • e.g. application in foundation engineering, reinforced concrete construction, building insulation; as load-bearing or non-load-bearing component; under static and quasi-static loading; fire exposure; other environmental exposures
  • Information regarding impact on regulatory concerns
    • in particular structural integrity, fire protection, health and environment protection, sound insulation as well as thermal performance
  • Explanation of need for an abZ/aBG
  • Contact details
    • preferably email address and/or telephone number, as well as name, organisation/company, and postal address

We will then contact you to clarify the next steps.

If you already hold a DIBt approval and/or construction technique permit and wish to apply for an amendment, supplement, or renewal, please use the form provided below.

abZ+aBG

Z
new decision
E
supplement
Ä
amendment
V
renewal
G
valid until
Subject concerned Applicant Decision no. Validity
from / to
Schwimmerschalter, eingebaut in die Steuerkette eines Grenzwertgebers, als Sicherheitseinrichtung für Lagertanks Afriso-Euro-Index GmbH Lindenstraße 20 74363 Güglingen Z-65.17-182 Z: 16.08.2023
G: 16.08.2028
Drucküberwachungs-Sicherheitssystem Typ "F-Stop® GWG-DEV" und Überfüll-Sicherheitssystem Typ "F-Stop® GWG-FSS" sowie Kombination Drucküberwachungs-Überfüll-Sicherheitssystem Typ "F-Stop® GWG-FSS-DEV" als Sicherheitseinrichtungen in Lagertanks GOK Regler- und Armaturen- Gesellschaft mbH & Co. KG Obernbreiter Straße 2-18 97340 Marktbreit Z-65.17-495 Z: 10.07.2025
G: 20.10.2027