How to choose the air tightness tester? An article to read a variety of waterproof sealing equipment testing principles and methods

Air tightness tester（简称airtightness meter)Mainly used for waterproof sealing test of products or componentsIt ensures that there are no defects in the measured object that could lead to water or air leakage, hence the nameWaterproof Test Equipment,airtightness leak detector,Sealing TesterThe

Jingcheng Gongke airtightness tester in the automated production line application — *Precision EngineeringAir tightness testerApplications in industrial production lines*

Air tightness meter is a widely used in new energy, household appliances, automobile parts, consumer electronics, medical equipment, security lighting, valves, pipelines, wire connectors and other seals air tightness test equipment, can be used as an industrial production line batch test, but also can be used as a factory quality sampling or corporate laboratory.

根据不同检测原理划分，Air tightness tester的常见检测方式主要有以下七种：

Article Catalog harbor (i.e. keep sth hidden)

I. Positive pressure

II. Negative Pressure

III. Quantitative

IV. Flow type

V. Differential pressure type

VI. Positive and negative pressure

VII. Helium mass spectrometry

Summarize

Ⅰ.positive pressure

Pressure decay method is also called pressure drop method, first, the workpiece under test is inflated, after reaching the target value, the inflation valve is closed, and the pressure change from inflation to pressure maintaining multi-stage is monitored, so as to determine whether the product under test is leaking or not.
Tips. If the pressure drops beyond the set standard threshold within a certain period of time, the airtightness of the product under test is considered to be unqualified; conversely, the airtightness is qualified within the test criteria.

1. Direct pressure test principle — *Positive Pressure Detection Schematic*

Instrument characteristics:Waterproofing test for any open, inflatable hole product.
Applications:Speakers, outdoor LED lighting, water purifier cartridges, etc.

Ⅱ.suction

First of all, through the instrument will be tested product sealing cavity pumping to the target negative pressure value, monitoring the pumping process pumping and testing process of each stage of the pressure change, to determine whether the product leakage.

2. Negative pressure test principle — *Negative Pressure Detection Principle*

Instrument characteristics: For open type products (with holes for air extraction), the pressure inside the product is made less than the external atmospheric pressure.
Applications:Automotive, home appliances, medical, valve bodies and electronic components.

III.quantitative

The workpiece under test is first inflated, and the mass volume of gas filled into the product under test is monitored to determine whether the product is leaking or not by judging the mass and pressure changes in the mass volume.

3. Volume Quantitative test principle — *Quantitative Detection Principle*

Instrument characteristics:Applicable to any fully enclosed, airtight products, compatible with open type. (JC-LZ10020 quantitative air tightness meter compatible with direct pressure test mode)
Applications:Watches, bracelets, cell phones, stopwatches, GPS locators, electric toothbrushes, etc.

IV.flow-through

By real-time monitoring of the gas flow changes into the product under test, based on the flow changes to determine whether it meets the test standards.

4. Gas Flow test principle — *Flow Detection Schematic*

Instrument characteristics:Suitable for leakage and blockage detection of open pipelines or vessels.
Applications:Various types of valves, vacuum pumps, piping, capillary tubes, etc.

V.differential pressure

Differential pressure method is through the instrument internal differential pressure sensor, in the test holding pressure process in real time to monitor the pressure difference between the tested parts and the standard parts, so as to determine whether there is a leakage exceeding the standard.

5. Differential Pressure test principle — *Differential Pressure Detection Schematic*

Instrument characteristics:For any high pressure, high precision product under test.
Applications:Die castings, new energy motor shells, new energy control boxes, etc.

VI.positive and negative pressure

Integrates both positive and negative pressure test modes, supporting both positive and negative pressure methods.

6. Positive & Negative Pressure test principle — *Positive and negative pressure detection principle*

Instrument characteristics:For open type products (with holes for pumping or inflating), the test pressure can be adjusted according to the real product protection level status.
Applications:Speakers, LED lamps, automotive, home appliances, medical, valves and electronic components.

VII.helium mass spectrometry

By spraying helium into the sealed part of the measured workpiece, and then analyzing the helium concentration from the opposite direction by vacuuming or probe monitoring, the size of the leakage value is calculated to determine whether the product is leaking or not.

9. Helium Detection Test Principle — *氦质谱检测原理图*

仪器特点：检测灵敏度高，可探测 3×10⁻¹³Pa·m³/s 级微小检漏率，定位泄漏位置，但是设备较为昂贵，氮气成本高。
Applications: medical equipment, valves and piping, water-cooled panels, etc.

此外在选择Air tightness tester时，还需要考虑这些因素：
1. Detection accuracy:The accuracy of the testing instrument is critical for some applications. If you need to test low or high pressure applications, then accuracy is very important.
2. Detection speed:Inspection speed is also important for some applications. If you need to inspect a large number of products quickly, you need to choose an instrument that can do it in a short period of time.
3. Scope of testing:不同的Airtightness testing equipment有不同的检测范围。因此，在选择检测仪器时，需要考虑您需要检测的产品的大小和形状。
4. Reliability:The reliability of the testing instrument is very important for the application on the production line. Therefore, a reliable instrument needs to be selected to ensure that the production line is not shut down due to instrument failure.

Summarize

Different models of instruments have different characteristics and application scenarios, thein choosingAirtightness testing equipment时，需要根据自己的应用需求和预算选择适合的仪器The

Shenzhen Jingcheng Engineering as a focus on airtightness testing more than 10 years of equipment manufacturers, has always been committed to China's smart manufacturing, to support the waterproofing products in various industriesAir tightness tester定制和全自动气密性检测方案供应。