Airtightness Tester (referred to as airtightness instrument) is mainly used for waterproof sealing detection of products or components, to ensure that there is no water leakage or air leakage defects in the object under test, and is therefore also called waterproof test equipment, airtightness leakage tester, airtightness tester.
Divided according to different testing principles, the common testing methods of the airtightness tester are mainly the following eight: 1, direct pressure:Pressure decay method is also called the pressure drop method, first of all, the interior of the workpiece under test is filled with compressed gas, and then turn off the gas source, and then observe the change in pressure over a period of time, through the detection of changes in the pressure drop to determine whether the product is leaking. (If the pressure drop exceeds the set standard threshold within a certain period of time, the airtightness of the product under test is considered to be unqualified; on the contrary, the airtightness is qualified within the test standard)
Direct Pressure Detection Principle Diagram
Instrument Features: Waterproof test for any open type, products with inflatable holes.
Applications: speakers, outdoor LED lighting, water purifier cartridge, etc..
2, negative pressure type:Pressure attenuation method is also called pressure drop method, first of all, the sealing chamber of the workpiece will be filled with gas, and then the negative pressure pump to pump out the gas in the sealing chamber, through the detection of changes in the amount of gas pumped out to determine whether the product leakage.
Negative pressure type detection principle diagram
The instrument features:? For open type products (with holes to pump gas), so that the pressure inside the product is less than the external atmospheric pressure.
Applications: automotive, home appliances, medical, valve body and electronic components.
3, quantitative:preferred to the measured workpiece volume inflatable, filled with a standard product to set the volume ratio, pressurized to the container inflatable, full and then inflatable with a fixed volume gas to the product, by comparing it with the standard product to determine whether the product leakage.
Quantitative detection schematic
Instrument features: applicable to any fully enclosed, closed products, compatible with open type. (JC-LZ10020 quantitative airtight instrument compatible with direct pressure test mode)
Applications: watches, bracelets, cell phones, code watches, GPS locators, electric toothbrushes and so on.
4, flow type:The flow method is used to detect airtightness by measuring the flow of gas into or out of the object under test. First, the object under test is connected to an accurate flow meter, and then the gas tightness of the object under test is evaluated by measuring the gas flow into or out of the object. If the flow rate exceeds a set standard threshold, the product under test is considered to be airtight; conversely it is airtight within the test criteria.
Flow Type Detection Principle Diagram
Instrument Features: Suitable for leakage detection and blockage detection of open pipelines or vessels.
Application scope: all kinds of valves, vacuum pumps, pipelines, capillary tube and so on.
5, differential pressure type:Differential pressure method is to produce a pressure difference between the inside and outside of the measured workpiece, and then measure the leakage rate through the workpiece to determine whether the product is leaking.
Differential pressure type detection principle diagram
Instrument characteristics: for any large pressure and high precision of the product being measured.
Applications: die casting, new energy motor shell, new energy control box, etc..
6, positive and negative pressure:Integrated positive and negative pressure two test modes, support positive and negative pressure type two methods.
Positive and negative pressure testing schematic diagram
Instrument features: for open type products (with holes for pumping or inflating), the pressure of the test can be adjusted according to the real state of product protection level.
Applications: speakers, LED lamps, automobiles, home appliances, medical, valve body and electronic components, etc.
7, bursting type:Bursting method is used to test the airtightness and pressure resistance of the workpiece, it is through the product inside the compressed air, the product or part of the internal and external pressure difference between the product or component, and measure the product or part of the time required to burst open.
Burst test schematic diagram
The instrument features: for airtightness, burst pressure, flip test.
Applications: new energy battery packs, power batteries, lithium batteries, rupture discs, breathing valves and so on.
8, Breathing cycle:Breathing cycle test is used to test the pressure impact fatigue resistance of new energy batteries or components, which is used to assess whether the life and safety of the battery meets the requirements by cyclic inflation and deflation of the battery interior, and then observing the change of the pressure inside the battery or the bursting pressure over a period of time.
Breathing cycle test schematic diagram
Features: Applicable to new energy products air tightness, breathing cycle, life test.
Application scope: new energy battery cells, power batteries, lithium batteries, explosion-proof sheet, battery cover, etc..
Additionally when choosing a hermeticity tester, you need to consider these factors:Testing Accuracy: The accuracy of the testing instrument is very critical for some applications. If you need to test low or high pressure applications, then accuracy is very important.
Inspection 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.
Testing range: Different airtightness testing instruments have different testing ranges. Therefore, when choosing a testing instrument, you need to consider the size and shape of the product you need to test.
Reliability: The reliability of the testing instrument is very important for the application on the production line. Therefore, you need to choose an instrument with high reliability to ensure that the production line will not be shut down due to instrument failure.
Summary:
Different models of instruments have different characteristics and application scenarios, and when choosing an air tightness testing instrument, you need to choose the right one according to your application needs and budget.
To learn more detailed airtightness testing program and application cases, please pay attention to the Precision Industrial Technology airtightness