Frequently Asked Questions

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Adlema is a company that researches, develops and produces leak testing devices for the needs of the industry at global standards. In addition to advanced leak testing devices using the pressure decay method, Adlema designs and manufactures quick connectors required for leak tests.

Many of the products manufactured in different industries must have leakproof property. The leakproof property is found in all products where it is not desired for fluids to pass from inside the product to the outside or from the outside environment into the product. Even if the products are designed with leakproof property, leaking problems may be encountered due to casting, assembly and material faults during the production stages. In order to detect the errors that occur due to the nature of the production, the products must be subjected to leak tests. According to industry standards and usage area the tests can be applied by taking samples or applied to all products passing through the production line. The products tested according to the determined parameters are divided into two categories as defect-free/leaking.

The product to be tested must be sealed before the leak test. The sealing of the product can be done using the CZ Series Quick Connectors, or it can be done with the help ofas well as with specially designed automation systems. In applications with small volumes or where there is no hole to let air into the product, the products are placed inside the EP60 IP standards Leak Test Kits. In this way, the external volume of the product can be pressurized. In the second stage, the leak test method to be used must be determined. These methods can be pressure decay, helium mass spectrometry or helium sniffer.

The traditional leak test methods consist of pressure monitoring with a transmitter and monitoring forming bubbles after immersing the product in water. The new generation test methods are differential pressure decay method, flow test and helium tests.

In the leak tests using the pressure decay method, the openings of the part are sealed. This sealing process can be done with CZ Series quick connectors as well as with specially designed automation systems. After this stage, the product is pressurized with air. The test pressure, which is monitored with the differential measurement method, at 0.1 Pa accuracy, decreases in case of leakage of the product. As a result of the tests carried out with air, the leakproof property of the product for gasses and liquids is tested.

Many products are required to have leakproof property. When manufacturers invest in quality control in the leak testing area, they expect a “0” leak to be detected in leak testing devices. But there is no product with “0” leakage. Every product leaks even if the leak is very little. The important thing is that these leaks, which will occur when the product is functioning, do not disturb the operation of the product and its safety. Discarding products that leak within the tolerance range returns unnecessary financial burden to businesses. In engineering applications parts produced are measured according to tolerances in industry standards. While it is sufficient to measure a part produced by machining with a caliper, it is not meaningful to examine it under the microscope and analyze errors in the scale of nanometers. The expectation of products in impossible standards is not sustainable for both the producer and the consumer.

In addition to determining the test pressure and leakage parameters, the material and product are also critical. It is necessary to develop different approaches for metal, glass, plastic etc. materials and different applications. Leak rates are determined using theoretical and practical experimental methods as well as the industry standards.

Leak Tests

The factors affecting the leak tests using the pressure drop method derive from the ideal gas equation. -PV=nRT- Test pressure, volume and temperature are important factors.

Although the ideal test time varies depending on the test pressure, the volume of the product and the desired precision, it is the minimum period in which the predetermined maximum leak amount can be detected.

The change in temperature also changes the pressure, so it is important to test in the most ideal conditions. For products with a very high thermal conductivity coefficient, testing can be done with the reference product, and leak tests can be performed without being affected by temperature changes.

In cases where the inside of the product can be pressurized, pressure can be introduced and the leak test can be performed. In cases where the inside of the product cannot be pressurized, the external environment of the product should be pressurized. In such applications, the control environment outside the product is pressurized by using the Adlema EP60 leak test kits. It is checked whether air is leaking into the product. If the pressure of the control environment leaks into the product, the pressure of the control environment will drop. In this way, it is checked whether the product is leaking or not.

In the pressure test, the product is filled with air at a pressure above atmospheric pressure, while in the vacuum test the product pressure is lower than the atmospheric pressure. If the product is leaking, the product pressure increases.

Adlema is on your side in choosing the most suitable leak test for your product. With our experience in the field of leak testing, we support you with our team expert in all matters such as test method, selection of test parameters, and testing.

Product volume is one of the important factors affecting leak tests. In flexible products, the change in the volume of the product by stretching affects the test. For this reason, the problems that may arise from the stretching of the product are prevented by using the pre-filling method.

The product is pressurized in pressure decay leak tests. If the product is leakproof, there will be no pressure change. With the differential measurement method, the product pressure is monitored with the accuracy of 0.1 Pa and it is decided whether the product is leakproof.

The product pressure of the vacuum leak tests is lower than the atmospheric pressure. By monitoring the vacuum pressure with an accuracy of 0.1 Pa, it is decided whether the product is leakproof.

Leak test is performed on products that are expected to have leakproof property. It is a quality control test performed in cases where fluids should not leak from inside the product or from the outside of the product. In leak tests, the amount of fluid passing through the outer surface of the product is measured. The reasons for performing the leak test may be consumer health, as well as the control of the leakproof property , which can be critical for the operation and efficiency of the product. In many industries, there are regulations determined by lawmakers for reasons such as environmental protection, sustainability or life safety.

Installation and Service

The training required for the operator to use the device includes device menus and how to perform the test. Predetermined test parameters cannot be changed by the operator without the authorization key, so you can be sure that you are testing with the correct parameters.

Adlema is a company that researches develops and produces leak testing devices using all available leak testing methods. With its expertise on leak testing, it works with manufacturers to determine parameters and test products on mass production lines.

The warranty period starts from the delivery date of the product and is 1 year. The warranty covers the product and all parts inside the product. It covers free repair for malfunctions caused by workmanship, assembly or material faults. A product with similar features is allocated to the user during the period the product is in service.
Every device produced is tested before being delivered to the user. All devices have a calibration certificate. Devices need to be calibrated once a year. During the calibration, a product with similar features is allocated to the user. Leak jets can be used to test the amount of leakage of products and the calibration of the device. Leak jets are designed to produce a specific amount of leakage. It can turn your defect-free product into a leaking sample.

Adlema BT4000 Series Leak Testing Devices can manage conveyor systems thanks to the built-in PLC module. Adlema Leakage Testers can work compatibly with your mass production lines.


No. A network connection is not required for the device to operate or to access data. The device can work without a network connection and data can be accessed with the help of USB. However, if desired, devices can be connected to the internet, test results and reports can be accessed from anywhere.

The electronic regulator is a proportional pressure regulator that works with an electrical signal. It is used to automatically adjust the test pressure without having to manually adjust it. Manual Regulator is a regulator that is used to reduce the pressure to the test pressure with a mechanical system. Pressure adjustment must be made manually.

There are several factors that affect the leak tests. Volume and temperature are factors to consider. In order to prevent the factors affecting the test, especially during the testing of large volumes or products that are open to temperature changes (heat exchanger), reference product application is conducted. The factors affecting the test quality are ruled out when tested product is also connected to the reference port on the Adlema BT4000 series devices from the tested products.

You can share the data you receive from the device with a USB or network connection with anyone you want.

Your test results can be transferred from the device with a USB or network connection and monitored in the desired format.

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