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Leak Detection Systems Overview
Operating Principles of Leak Detection Systems
Container Design
Liquid / Gas Medium
   ASF Leak Detector Type D26 - Pressure Principle

   General Design Permit (DIBT) No. Z-65.26-249 (Tested by TÜV Nord, Hamburg)
   Available as 2/4 bar Version (pressureless pipeline) and 8/10 bar Version

Print Version

  • The leak detector is used for monitoring of underground and aboveground double-walled pipelines.
  • For monitoring of water-polluting liquids and flammable liquids with a flash point < 55°C.
  • The max. allowable operating pressure is 17 bar.
  • The alarm switching value must be min. 2 bar above the operating pressure of the inner tube.
  • Also other monitoring pressures than the specified default values can be set (for details please see the technical description).
  • The leak detector can be connected to multiple pipelines by using an appropriate manifold.

The leak detector must be mounted outside the hazardous area (ex-zone)!

  • The leak detector works according to the pressure principle.
  • The interstitial space is filled with inert gas - nitrogen (N2). When connected to a (stationary) inert gas supply, the required monitoring pressure is balanced on demand via the built-in solenoid valve and timer.
  • The monitoring pressure must be set at a minimum of 4 bar when using depressurized pipelines.
  • With built-in potential-free relay.
  • The leak detector is pressure-proof up to max. 25 bar.

Standard Switching Values:
At working pressure Po of:


0 bar

6 bar

17 bar


4 bar

10 bar

21 bar

Alarm ON PAE

2 bar

  8 bar

19 bar

For further data please see the data sheet of the D26 leak detector.

Operating Conditions
  • The interstitial space of the double-walled piping must be suitable for connecting the leak detector.
  • The double-walled pipeline must have the General Building Inspection Certificate (formerly Prüfzeugnis) or an admission of an other certified office.


Mounting kits (MBS) and manifolds.

Mounting Examples

Please click on the picture for a larger view!

Picture a Picture b
Picture c
Product Images

Leak Detector Type D26 - Pressure

Installation and Operation Manual D26Installation and Operation Manual D26
Data Sheet D26Data Sheet D26
General Design Permit (DIBT) D26General Design Permit (DIBT) D26
D25 AccessoriesD26 Accessories & Assembly Kits


Print Version

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