Construction products detail

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

A national technical approval (abZ) and/or oder general construction technique permit (aBG) is granted upon application (see Model Building Code (MBO), Sections 16a(2) and18(2) and (4)). This also applies to amendments and supplements to, or renewals of existing approvals and/or construction technique permits.

No formal requirements apply. The following information is needed: name and address of the applicant, description of the product and/or construction technique and its field of use or application, type of decision required (new decision, amendment or supplement to, or renewal of, an existing decision).

Please feel free to use the template below.


new decision
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: 21.09.2022
G: 20.10.2027