Direct Pressure Air Tightness Tester: Principle Diagram and Technical Specifications

Direct pressure basic principle diagram

'Direct pressure' type air tightness testers are used to determine the integrity of sealed systems by applying pressure and measuring the rate of pressure loss. This method is commonly employed in various industries, including automotive, aerospace, and medical device manufacturing.

The principle of direct pressure testing involves pressurizing the system under test with a known gas (typically air) and then measuring the rate of pressure decay over time. A leak is detected when the pressure inside the system drops faster than expected, indicating that gas is escaping. The rate of pressure decay is directly proportional to the size of the leak.

Technical parameters of direct pressure type air tightness tester:

• Pressure range: The maximum pressure that the tester can apply to the system under test. This parameter is critical for ensuring that the tester can provide sufficient pressure to adequately test the system.
• Pressure accuracy: The accuracy with which the tester can measure the applied pressure. This parameter is important for ensuring the reliability of the test results.
• Leak rate sensitivity: The smallest leak that the tester can detect. This parameter determines the sensitivity of the test and its ability to detect small leaks.
• Data logging: The ability of the tester to record and store test data. This feature is important for documentation and analysis of test results.
• Communication interface: The availability of interfaces for connecting the tester to other devices, such as computers or data acquisition systems. This allows for automated data collection and analysis.

The selection of a direct pressure air tightness tester depends on the specific requirements of the application, such as the size and pressure of the system under test, the desired sensitivity of the test, and the need for data logging and communication capabilities.