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Sealing leak detector is a kind of air tightness leak detector using compressed air detection method, which is widely used in product sealing test and waterproof leak detection

Sealing leak detector is a kind of air tightness leak detector using compressed air detection method, which is widely used in product sealing test and waterproof leak detection

Air tightness leak detectorcharacteristic:

Equipped with high sensitivity sensor and pressure regulating valve, the minimum resolution can be achieved0.01pa

Minimal internal volume (1.5cc), maximum guaranteeAir tightness detectorThe stability of the system.

Full color graphic touch screen operation, using large size touch screen as human-machine interface display

Unique pneumatic sealing technology, ensure the test accuracy, small size (254x280x400)

Wide pressure range (0-0.4mpa), and can realize multiple pressure sequence test, meet the requirements.

Intuitive and easy-to-use user interface, practical and accurate curve, accurately grasp each link of the test process.

Air tightness leak detectorBuilt in multiple serial port, Ethernet port and PLC I / O interface, can control peripheral fixture or equipment, programming is simple

Air tightness leak detector可扩展性强可以灵活配置输入输出设备,如:条码扫描仪和打印机等

Realize real-time data storage and product traceability, and the history can be expanded infinitely.

Equipped with powerful upper computer software, it can realize network management and temporary control operation status.

It only needs a simple calibration process and only needs to change a parameter to complete the calibration.

The system has up to 60 subroutines, each subroutine can be set individually parameters, parallel test, can also be connected in series subroutines, test, you can realize the complex test process.

Air tightness testerThe instrument has 6-way switch input and 8-way switch relay output for users. The user can make these input and output ports achieve the desired action by simple programming on the touch screen. Control peripheral fixture.

Item 2: introduction of parameters

Common sealing test methods

Traditional seal test method

气密性检漏仪

Bubble method: put a certain pressure of gas into the closed workpiece cavity, sink the workpiece into water (or other liquid), and observe whether there is bubble overflow. Or apply soapy water on the surface of the workpiece to observe whether there are bubbles( The test efficiency of this method is not high, human factors have great influence on the test effect, there is no accuracy to speak of, the data can not be quantified, and it is not convenient to track and judge the cause. Cause secondary pollution to the product, need to dry, wipe. The only advantage is that it can be foundleakIn many cases, tiny bubbles are not easily detected by the naked eye; bull; In many cases, tiny bubbles are not easy to be detected by the naked eye, so it is not the most suitable test method for tightness, but a simple test method.

The following reasons can also cause inaccurate seal detection, such asleak-But there are no bubbles

A. Surface tension of water & amp; ndash; Water molecules may block the leak

B. In the case of minimal leakage, the gas molecules can melt into the water - no bubbles

C. Extremely dependent on human judgment, lack of rigor!!

NewSealing leak detectionmethod

1. Pressure drop method:

Mainly used inSeal detection of small household appliances,Sealing test of medical devicesLeak detection of stainless steel containerThe principle is that a certain pressure gas is injected into the closed workpiece cavity, and the pressure is stabilized for a period of time, then the compressed air supply of the component is disconnected (the valve is closed), and then the pressure change is measured after another measurement time. If there is a leak, the sensing pressure will drop.

At the same time, the measured object and the reference object at both ends of the differential pressure sensor are filled with compressed air. In a certain period of time to detect the leakage caused by the differential pressure sensor on the micro differential pressure. According to the output change of the differential pressure sensor, the leak detector can quantitatively calculate the leakage of the measured objectleakIt's not the usual leakage rate. The existence of the reference object minimizes the impact of the test 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 the detection.

2. Pressure difference method:

气密性检漏仪

Hermetic testerMainly used forValve and pipe seal inspection, stainless steel weldingProduct seal testSand hole microleakage test for sealing inspection of aluminum alloy die casting products. The principle is similar to the pressure drop method, but the method is better. A certain pressure of gas is injected into the closed cavity of the workpiece, and the same pressure of gas is injected into a standard tank at the same time. After standing for a period of time, observe the pressure in the standard tank and the workpiece, and observe the tiny pressure difference on the differential pressure sensor due to leakage. According to the output change of the differential pressure sensor, the leak detector can quantitatively calculate the air leakage of the measured object. The existence of the reference object minimizes the impact of the test 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 the detection.

3、leakCollection method:

It is suitable for testing occasions with low requirements. For example:IP levelWaterproof testSuch as outdoor electrical products waterproof testingThe method is that one side of the cavity is pressurized, and the other side (cavity) collects the leakage gas and reduces the volume of the cavity as much as possible, so as to increase the change speed of the pressure per unit leakage.

4. Air flowAir tightness leak detector: use the method of instantaneous loss flow to test the productSealing test。 The main principle is that the sensor can directly detect the leakage rate of the product and display it in real time, which can basically save the cumulative time of leakage test in the original pressure leakage test method. This product has fast test speed and can directly display the leakage unit, which is suitable for products with requirements for test efficiency. The measurement signal of flow measurement has nothing to do with the test volume, which is different from that of pressure measurement. This is an advantage in calibration. The measurement signal directly corresponds to the gas flow through the leakage calibrator. In the calibration process, it is no longer necessary to know the exact test volume or to determine the leakage rate. Volume flow method is generally not used for leakage detection, but for flow control. For example, before using the same measuring element (differential pressure sensor) to carry out the leakage test of depressurization method, the free channel in the gas system is monitored for flow. In the mass flow method, the test signal is not only independent of the test volume and the test pressure, but directly corresponds to the standard leakage rate STD cm3 / min, unlike the allowable leakage rate in the pressure method.

HarrisWith rich experience in air tightness leak detection industry, we can choose the most suitable test equipment according to the situation of customers, and can provideAir tightness testCustomized equipment design, education and training.

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