Dichtheitsprüfung

Leak testing

Leak testing is at home in many different industries, from the automotive sector to thermal or medical technologies, and is a crucial part of the quality control. Leak tightness is the decisive factor and criterion for a large number of products. We are concentrating on our core competencies in helium and ultrasonic leak testing.

Helium leak test

The helium leak test is a fast and process-reliable semi or fully automatic test method that can be used for reliably detection and localization of even very small leaks. And that both in the laboratory and in large-volume series production.

Ultrasonic leak test

The universally applicable ultrasonic leak test is the new dimension of gas bubble detection in the water bath. This is an objective, worker-independent, semi or fully automatic leak test method for industrial series production. A particular advantage is that the leakage points can also be automatically localized very precisely.

Leak testing systems for series production

Various sensors are used for leak testing in series production. An extremely important point is that in leak testing procedures, it is not uncommon to mention the detection limit of the sensor but not the detection limit or detectable leakage rate of a leak testing system or device. The determination of the leakage rate of a leak testing system always depends on the respective application and test object. There are several methods in the field of leak testing. Which leak test method is the right one always depends on the type of application. The following overview shows the most frequently used sensors and their detection limits.

Procedure
Helium vacuum
Helium atmosphere
Ultrasonic
Sensor

Mass spectrometry

e.g. Wise TechnologyTM

Ultrasonic probe

What is measured / detected?

Current 10 – 15 A.

2 ⋅ 10–10 A

Air bubble < 0,1 mm Ø

Detection limit

10–12 mbar ⋅ l/s

10–6 mbar ⋅ l/s

10–8 mbar ⋅ l/s
(Idealized examination in a laboratory measuring unit)

Procedure
Sensor
Helium vacuum

Mass spectrometry

Helium atmosphere

e.g. Wise TechnologyTM

Ultrasonic

Ultrasonic probe

Procedure
What is measured / detected?
Helium vacuum

Current 10 – 15 A.

Helium atmosphere

2 ⋅ 10-10 A

Ultrasonic

Air bubble < 0,1 mm Ø

Procedure
Detection limit
Helium vacuum

10–12 mbar ⋅ l/s

Helium atmosphere

10–6 mbar ⋅ l/s

Ultrasonic

10–8 mbar ⋅ l/s
(Idealized examination in a laboratory measuring unit)

Procedure
Sensor
Hydrogen

Semiconductor sensor

Pressure difference

Pressure sensor

Worker examination

Eye

Procedure
What is measured / detected?
Hydrogen

Electricity

Pressure difference

1 – 0,1 Pa

Worker examination

Air bubble 1 mm Ø

Procedure
Detection limit
Hydrogen

10–6 mbar ⋅ l/s

Pressure difference

10-4 mbar ⋅ l/s at 1 Pa, 0,1 l volume and 10s

Worker examination

2,6 x 10–5 mbar ⋅ l/s in 20s

Procedure
Helium vacuum
Helium atmosphere
Ultrasonic
Sensor

Mass spectrometry

e.g. Wise TechnologyTM

Ultrasonic probe

What is measured / detected?

Current 10 – 15 A.

2 ⋅ 10-10 A

Air bubble < 0,1 mm Ø

Detection limit

10–12 mbar ⋅ l/s

10–6 mbar ⋅ l/s

10–8 mbar ⋅ l/s
(Idealized examination in a laboratory measuring unit)

Procedure
Hydrogen
Pressure difference
Worker examination
Sensor

Semiconductor sensor

Pressure sensor

Eye

What is measured / detected?

Electricity

1 – 0,1 Pa

Air bubble 1 mm Ø

Detection limit

10–6 mbar ⋅ l/s

10-4 mbar ⋅ l/s at 1 Pa, 0,1 l volume and 10s

2,6 ⋅ 10–5 mbar ⋅ l/s in 20s

Procedure
Hydrogen
Pressure difference
Worker examination
Sensor

Semiconductor sensor

Pressure sensor

Eye

What is measured / detected?

Electricity

1 – 0,1 Pa

Air bubble 1 mm Ø

Detection limit

10–6 mbar ⋅ l/s

10-4 mbar ⋅ l/s at 1 Pa, 0,1 l volume and 10s

2,6 ⋅ 10–5 mbar ⋅ l/s in 20s

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