Leak Tester | Flow Meter

The right Tester for every Case

Leak tests with compressed air or tracer gas

Always a good idea – guaranteed for your testing task too. We work daily with the devices that we sell and install in our test benches.

Since our foundation in 2011, we have specialised in the field of industrial leak testing and are now one of the market leaders. Whether leak testing or flow measurement: we are independent of manufacturers, so that you receive the right device from us for every testing task – tested by us and optimally integrated into your existing processes. We pay particular attention to user-friendly handling and intuitive operation in order to increase productivity.

The major advantage of leak testers compared to sensors and controllers is the self-contained measuring chain. This enables the use of DakkS calibrated devices. This is recommended, for example, in the automotive industry (certification according to IATF 16949).

In the event of servicing, the devices can be replaced quickly, thus ensuring short system downtimes.

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Overview of Test Methods

Dichtheitsprüfgeräte für Prüfmethoden mit Druckluft
Process with compressed air
Relative Pressure

In relative pressure measurement, a test part is pressurised and the change in pressure is then measured in the set time. In the positive pressure test, the test pressure is higher than the ambient pressure. If the test pressure is lower, the method is referred to as negative pressure or vacuum testing.

Advantages of the method: The relative pressure or absolute pressure method is characterised by a compact test setup with a large measuring range and offers a high level of automation potential within the test processes.


Differential Pressure

Beim Differenzdruckverfahren wird neben dem Prüfling ein Referenzteil mit Druckluft beaufschlagt. Ein Differenzdrucksensor ermittelt während der Messphase die Differenz zwischen Prüfling und Referenzteil und damit die Leckrate.

Vorteile gegenüber der Relativdruckmessung: Das Differenzdruckverfahren stellt bei höherem Prüfdruck eine Messwertauflösung und somit größere Messgenauigkeit sicher.


Pressure Increase

With pressure rise measurement, the test part is pressurised on the primary side and the pressure escaping in the event of a leak is measured on the secondary side. This method is suitable, for example, for valves, injection valves, sprinklers or parts with a known leakage point.

Theadvantage of this method is high test pressures of up to 500 bar on the primary side. Reduction of temperature effects, as a low control pressure is used on the secondary side.


Cavity Testing

In the classic leak test, the product to be tested is pressurised with compressed air from the inside and the pressure loss is measured. However, there are test parts that are encapsulated or sealed and do not have an opening for pressurisation, but still need to be tested for leaks. This is where the cavity leak test (cavity test, bonnet test or bell test) is used. As experts in special machine construction, we produce simple to highly complex cavities in-house, e.g. on our CNC machining centre.

Possible test parts: electrical sensors with cables or plugs, blister packs, lights, vials or industrial cameras, car keys, electric toothbrushes and much more.


Mass Flow Measurement

The mass flow measurement provides a measurement signal that is independent of the size of the test volume. It is a thermal method that is also independent of the level of pressure and temperature in the atmosphere.

The measurement signal corresponds directly to the leak rate in standard cm3/min.
The built-in pressure regulator keeps the measuring pressure constant even with high leakages. For smaller leaks, the air flows in from a reference / reservoir volume in order to obtain a constant measurement signal.

Advantages and features: large-volume test parts / small leaks, measuring unit standard cm3/min


Flow Measurement

In flow measurement, the volume of air flowing through the measuring element is measured. A distinction is made between the mass flow method and the volume flow method.

Advantages or applications: Testing of pressure equalisation elements / diaphragms (DAE) Detection of blocked ducts in e.g. cooling circuits, cross-section detection


Bubble Test

The bubble test or underwater test (visual inspection under water) is a frequently used test method. Here, a pressurised test specimen is completely immersed in a test liquid or wetted with a test medium which, for example, throws bubbles when air escapes. If the test processes are carried out professionally and carefully, the method delivers very accurate results.

Advantages of the method: low costs due to a comparatively simple test set-up, localisation of the leakage point, temperature insensitive


Dichtheitsprüfgeräte für Prüfverfahren mit Helium oder Tracergas
Process with tracer gas
Helium Testing

For leak tests with helium, the test part is filled with helium and placed in a test chamber with a vacuum. Leaks are identified by the increasing helium concentration inside the test chamber.

Another method is "sniffing". Here, the test part is pressurised with helium and a sniffer probe is used to check whether helium is escaping at the potential leakage points.

Advantages of the method: The method is ideal for testing tasks where very low leak rates need to be detected with high accuracy. Temperature effects only play a subordinate role compared to the compressed air method.

Examples of test specimens include battery housings, heat exchangers, heat pumps, fuel lines, generators for air conditioning systems, sensors, medical accessories and much more.


Forming Gas

Works exactly like the helium test only the leak rates are not as low (max. 10-5mbar*l/s)

Take advantage of our expertise and experience. Our experts will be happy to advise you without obligation and answer your questions.