The sealing leak detector is an air tightness leak detector that uses compressed air detection method. It is widely used in product sealing testing and waterproof leak detection.

Air tightness leak detectorcharacteristic:

 Equipped with high sensitivity sensor and pressure regulating valve, the minimum resolution can reach0.01pa，Extremely small internal volume (1.5cc) ensures maximumAir tightness detectorstability.

Full-color graphic touch screen operation, using a large-size touch screen as the human-machine interface display, unique pneumatic sealing technology to ensure test accuracy, small size (254X280X400), wide air pressure range (0-0.4MPA) and can realize multiple sets of pressure sequential tests to meet the requirements.

Intuitive and easy-to-use user interface, realistic and accurate curves, accurately grasp every aspect of the testing process.

Air tightness leak detectorBuilt-in multiple sets of serial ports, Ethernet ports and PLC I/O interfaces can control peripheral fixtures or equipment, and programming is simple

Equipped with powerful host computer software, it can realize network management and instant control of operating status. It only requires a simple calibration process and only needs to change one parameter to complete the calibration.The system has up to 60 subroutines. Each subroutine can be individually parameterized and tested in parallel. The subroutines can also be connected in series for testing to achieve complex testing processes.

Air tightness testerThe instrument comes with 6 switching inputs and 8 switching relay outputs for users to use.Users can make these input and output ports achieve the actions desired by the user through simple programming on the touch screen.Control peripheral fixtures.

Item 2: Parameter introduction

Common seal testing methods

Traditional seal testing methods

Bubble method: Pour a certain pressure of gas into a closed workpiece cavity, sink the workpiece into water (or other liquids), and observe whether bubbles overflow.Or apply soapy water on the surface of the workpiece and observe whether bubbles are formed.(The test efficiency of this method is not high. Human factors have a greater impact on the test results. There is no accuracy at all. The data cannot be quantified, making it inconvenient to track and determine the cause. It causes secondary pollution to the product and requires drying and wiping. The only advantage is that it can be foundleakagepoint, this method is quite backward) In many cases, very small bubbles are not easily detectable by the naked eye.• In many cases, very small bubbles are not easily detected by the naked eye. Therefore, it is not the most suitable sealing test method, but is only used as a simple test method.

The following reasons can also cause inaccurate sealing detection:leakage-But no bubbles are produced:

 A. Surface tension of water&– Water molecules may block leaks

 B. In the case of extremely small leakage, gas molecules can be integrated into the water - no bubbles are generated.

C. Extremely dependent on human judgment and lacks rigor!!

new typeSealing leak detectionmethod 

1. Pressure drop method:

Mainly used in Seal inspection of small household appliances,Medical device seal testing，Stainless steel container leak detection, the principle is to pass a certain pressure of gas into a closed workpiece cavity, wait for a period of time to stabilize the pressure, then cut off the compressed air supply to the component (the valve is closed), and then measure the pressure change after another measurement time.If a leak is present, the sensing pressure will drop.

At the same time, compressed air is filled into the measured object and the reference object located at both ends of the differential pressure sensor.Detect the small pressure difference generated on the differential pressure sensor due to leakage within a certain period of time.The air tightness leak detector quantitatively calculates the pressure of the measured object based on the output changes of the differential pressure sensor.Air leakageThe amount is not the leakage rate that is usually mentioned.The existence of the benchmark minimizes the impact of testing when the external environment and the work itself are different.It overcomes the shortcomings of the above methods and improves the efficiency, accuracy and reliability of detection.

2. Pressure difference method:

Hirays air tightness testerMainly used forValve and fitting seal testing, stainless steel weldingProduct seal testing, Sand hole micro-leakage test for sealing detection of aluminum alloy die-casting products.The principle is similar to the pressure drop method, but the method is better.Pour a certain pressure of gas into the sealed workpiece cavity, and at the same time, pass the same pressure of gas into a standard tank, and wait for a while to observe the pressure in the standard tank and the workpiece, and the tiny pressure difference generated on the differential pressure sensor due to leakage.The leak detector quantitatively calculates the air leakage of the object under test based on the output changes of the differential pressure sensor.The existence of the benchmark minimizes the impact of testing when the external environment and the work itself are different.It overcomes the shortcomings of the above methods and improves the efficiency, accuracy and reliability of detection.

3、leakageCollection method:

Suitable for testing situations with low requirements.like:IP ratingWaterproof test，Such as waterproof testing of outdoor electrical products, the method is to pressurize one side of the cavity, collect leakage gas on the other side (cavity), and reduce the volume of the cavity as much as possible to increase the rate of pressure change per unit leakage.

4. Air flow Air tightness leak detector: Use the method of instantaneous loss of flow to test the product under testTightness test.The main principle is that the sensor directly detects the leakage rate of the product and displays it in real time, which can basically save the leakage test accumulation time in the original pressure leakage test method. This product has fast testing speed and can directly display the leakage unit, which is suitable for products that require testing efficiency.The measurement signal of flow measurement has nothing to do with the test volume, unlike pressure measurement where the measurement signal decreases as the test volume increases.This is an advantage during calibration. The measurement signal corresponds directly to the gas flow through the leak calibrator. The exact test volume no longer needs to be known during the calibration process, nor does it need to be considered to determine the leak rate.The volume flow method is generally not used for leak detection but for flow control, such as flow monitoring of free channels in a gas system before performing a pressure reduction leak test using the same measuring element (differential pressure sensor). In the mass flow method, the test signal is not only independent of the test volume but also the test pressure, but directly corresponds to the standard leakage rate Std cm3/min, unlike the pressure method measurement where the allowable leakage rate must be calculated.

Hai RuisiWith rich experience in the air tightness leak detection industry, we can choose the most suitable testing equipment according to the customer's situation and provideAir tightness testEquipment customization design, as well as education and training work.