Leak test systems for industrial serial production
For leak testing in industrial serial production different sensors are used. Often the detection limit of the sensor is mixed-up with the detection limit of the leak test system, the so called detectable leak rate. To determine the exact leak rate that can be detected by a leak test system depend on the specific application and test object. The following table shows an overview about the sensors that are most commonly used and their detection limit as well as the “real” detection limit. In connection with the table we look at the different methods regarding the use in leak testing. There are a number of methods and techniques for leak testing. Which of the different methods is the right and correspondent one always depends on the application and test object. We Show the different methods and for which application it is suitable. Furthermore the definition, calculation and conversion of leak rates are listed. Do you have more issues or questions regarding the diverse methods and applications. Please send us an email or give us a call. Together we will find the ideal solution for your specific application.
| Operation | Helium-Vacuum | Helium-Atmosphere | Ultrasonic |
|---|---|---|---|
| Sensor | mass spectrometer | 10-15 A(current) | 10-12 mbar x l/s |
| Was is measured/detected? | z.B. Wise TechnologyTM | 2 x 10-10A | 10-6mbar x l/s |
| Detection limit | ultrasound transducer | air bubble < 0,1 mm | 10-8 mbar x l/s in 60s |
| Operation | Hydrogen | Differential pressure | Underwater visual testing |
|---|---|---|---|
| Sensor | semi-concudor sensor | pressure sensor | eye |
| What is measured/detected | current | 1 – 0,1 Pa | air bubble 1 mm Ø |
| Detection limit | 10-6 mbar x l/s | 10-4 mbar x l/s at 1 Pa, 0,1 l volume and 10s | 2,6 x 10-5 mbar x l/s in 20s |