Leak testing using compressed air can be used to test the leak tightness against liquids, as the viscosity of air is lower than that of liquids. The differential pressure test method is often used here, in which the leakage-related pressure drop is measured as a pressure difference against a tight reference volume. The minimum leak rates that can be detected with this method are in the order of ^10-3 mbar*l/s. If the leak only consisted of a single hole, this would have a diameter of around 20 micrometers at a test pressure of one bar.

The size of the products that are tested for leaks ranges from small-volume microswitches with a volume of 0.1 milliliters to tanks with a capacity of 1,000 liters. Depending on the application, Ceta leak testers with overpressure or differential pressure sensors are used. Available pressure ranges are between minus one and 30 bar up to 400 bar with the pressure increase method (e.g. testing injection valves).

Leak testing
Typical leak testing tasks include testing for oil or water leaks. Many products can be tested using suitable methods: products that can be filled directly (housings, gearbox covers, containers, lights), objects whose internal and external tightness must be ensured (ball valves, gears), components with pressure equalization elements (diaphragms) and encapsulated test parts (sensors, microassemblies, clocks).

Leak testers with calorimetric mass flow sensors and various measuring ranges (up to 600 ml/min) are used to detect the smallest leaks in large-volume test parts. Here, the mass flow caused by the leakage is determined directly. Very low leakage rates down to ^10-6 mbar*l/s (corresponds to a hole diameter of 0.1 micrometers at one bar test pressure) can be detected with hydrogen leak testers. The patented and highly sensitive method is based on the detection of gases or vapors that escape from the test part in the event of a leak. It can be used to detect forming gas (five percent hydrogen, 95 percent nitrogen), alcohols, solvents and generally volatile organic gas or vapor mixtures. These are either present in the test part per se or are introduced beforehand as tracer gas.

Flow test
In addition to leak testing, there are products that are tested for flow rate. With the Ceta flow testers, a range from 3 ml/min to 200 l/min can be mapped with different laminar measuring sections. Typical products for which the flow rate is tested are pipes, cooling ducts, valves, exhaust systems and membranes. The test devices are usually integrated into automated series production lines. Various industrial interfaces are available for the connection.

Customers from the automotive, e-mobility, fittings, heating and air conditioning, medical technology, packaging and household appliance industries use Ceta test devices for quality assurance and production validation. The company is certified according to DIN ISO 9001 and the calibration laboratory (D-K-19566) is accredited as a DAkkS calibration laboratory (according to DIN EN ISO/IEC 17025) for the measurand pressure up to 60 bar (also for on-site calibrations).

The decision as to which test method is suitable depends on many factors, including the special properties of the test part, the test parameters, the production cycle and the specifications for measuring equipment capability. as

Hall 3, Stand 3320