A Comprehensive Analysis of Waterproof Test Performance Using Waterproof Test Machine

What is the working principle of the water pressure waterproof test Air tightness waterproof test can be divided into many kinds, according to the detection method, can be divided into positive pressure, negative pressure; mainstream method); according to the purpose of detection, it can be divided into leak detection, blockage detection, and flow detection. No matter what kind of air tightness and waterproof test, it uses compressed air as the medium for detection.

I.Waterproof test

How to detect waterproof Airtight waterproof detector is also called airtight waterproof test, airtight waterproof testing machine, airtight waterproof detector, the instrument uses compressed air as the medium, and uses differential pressure detection for detection. Through a series of adjustment and detection processes such as differential pressure sensors and precision pressure reducing valves, the excellent judgment of the tested product is completed. It can meet the detection requirements of the national waterproof level IP67/IP68 or even higher.

LISUN JL-X waterproof test machine is according to IEC60529:1989 +A1:1999 +A2：2013 《Degrees of protection provided by enclosures(IP Code)》, IEC60598, IEC60335 and IEC 60034-5, GB/T-2423.2, GB4208, GB7000.1. The JL-X includes the following test grades: IPX1, IPX2, IPX3, IPX4, IPX5, IPX6, IPX7 and IPX8 (Refer to page 51 of IEC60529). It is widely used in the authentication test organization for the products such as electrical & electronic products, LED luminaires as well as in the relevant quality control department for the waterproof detection of the enclosures protection grades.

II.Air tightness and waterproof testing machine
The principle of air-tightness and waterproof testing equipment is to put the product to be tested into a fixture that is relatively sealed and conforms to the shape of the product, and then inflate or pump air to the fixture, and check the change of air pressure inside the sealed cavity of the fixture According to the situation to determine the sealing and waterproofing of the product, to judge whether the sealing has reached the predetermined requirements, if the sealing is passed, then the product will not have water seepage, and the waterproof function of the product will be achieved.

Is there any equipment for IP level waterproof testing? The instrument for IP level waterproof testing is actually a waterproof tester. In essence, it is an air tightness tester or a differential pressure leak detector. It is called a waterproof tester according to the purpose of the test. Density detector, etc., the main principle is one.

At present, most of the long-term waterproof detectors on the market use differential pressure detection. Compared with direct pressure detection, the data of differential pressure detection is more accurate and reliable. Its working principle is very simple. It is like a balance. The two ends of the balance are the detection end of the workpiece to be inspected and the standard end (completely sealed) that comes with the instrument. The two ends of the balance are filled with equal pressure gas. If there is leakage at the detection end, Then the balance must be unbalanced, use the differential pressure sensor to read the value of the difference between the two ends, which is the leakage value of the workpiece to be inspected.

As for linking IP waterproofing with airtightness, it is mainly based on the IP level standard to be achieved, and the water pressure is converted into the corresponding air pressure for testing. At present, most waterproof products such as mobile phone accessories, watches, lamps, speakers, etc. are tested by waterproof testers.

At present, there are many domestic manufacturers of such instruments, and the quality is also uneven. The quality of imported products is good, but the price is slightly higher. According to their internal structure, I personally think that Europe and the United States are better. At present, individual manufacturers of domestic instruments are not inferior to imported instruments in product quality, which is also a good choice.

III.What are the waterproof testing equipment for watches?
Here we first briefly explain some specific definitions of IP XX
IPXX means degree of protection
The first X number is dustproof and foreign object intrusion prevention. The second X number represents the moisture-proof and waterproof level
The first is divided into 0~6 and the second is 0~8 or 9 (different standards may be different). If you are interested, you can directly find out about it on Baidu.
It can be seen from the regulations that generally those with a waterproof level are IP6X, because if the first number is not 6, basically there is no waterproofing.

IV. The problem of waterproof level test.
In the test experiment of water discharge level, there are relatively clear test conditions and test methods, but there are only qualitative test standards, and most of them have no quantitative test standards. In fact, it is not difficult to see that most of the test methods in the test standards are suitable for laboratory sampling testing, but not suitable for product testing on production lines.
At present, the online testing of most products is basically carried out by air-tightness testing instruments.

At present, there are many brands of air-tightness testing instruments. Some manufacturers have also launched special leak detectors for waterproof level testing for publicity. In fact, for the IP6X waterproof test, the general test pressure is not very high, and the relatively allowable leakage range is relatively large. It should be said that it is not a difficult project in the leak test industry. The leak detectors produced by regular domestic professional manufacturers are completely competent, and there is no need to choose imported instruments. But at the same time, there are great differences in domestic products, so choose carefully.

V. So what kind of leak detector is more suitable for the detection of IP6X products?
First the product you want to test

1. The test pressure of the product, if the pressure of the test product is low, do not choose a high-pressure car instrument. Some people choose to import 700Kp test equipment even though the test pressure is only 10kPa, not to mention that the price is almost doubled. The accuracy of the pressure regulator and pressure sensor is not ideal.

2. The cavity of the workpiece to be tested. If you are testing an electronic device with a relatively small cavity, the cavity of this product is very small. At this time, you’d better choose an instrument with a smaller inner cavity for testing. The cavity of the instrument is relatively large, and the cavity of the workpiece is relatively small, so the accuracy and efficiency of the test will be compromised. The idea is that if the workpiece is larger, the requirements for the cavity are less stringent.

3. Whether it is used by a single unit or by multiple units at the same time. When multiple units are used, individual differences in instruments, differences in tooling fixtures, differences in connecting pipelines, etc., will cause errors in the data generated by testing the same workpiece. This requires the instrument to have a certain data correction function when processing data, so that Guarantee the consistency of the test results of multiple instruments.

4. Clarify the allowable leakage range of your product, whether this value exists, and if so, what unit is it. Is it Pa or Pa/s or ml/min. This is a very critical thing. What is the neutralization of the cavity connecting the pipeline and the workpiece during the test, and the change of this value will completely change the test result.

VI.Basic knowledge of leak detector
The leak detector we are talking about now refers to using air as the medium (or nitrogen, etc.), and judging whether there is a workpiece exceeding the allowable leakage range of the tested part through a small pressure (pressure) change. Most of them use differential pressure sensors for testing.

1.At present, there are imported and domestic products in the market from the place of origin.
The imported products have relatively mature technology, good workmanship and many functions, but their prices are relatively high, and most of them have foreign language interfaces. For ordinary operators, setting up and using them is a nightmare. For the IP6X sealing test, it is a bit extravagant to use imported instruments for testing. If it is not designated for special purposes, there is really no need to choose those imported instruments that are expensive and difficult to set up.

Domestic products are mixed, and the reason why many people still choose imported instruments is mainly because many domestic products are afraid to buy. They all say they are perfect, but some of them are bought back, and there are many problems, which affect production. In the end, it didn’t work and I had to buy it again. It is difficult to choose an instrument, and it is difficult to go to the blue sky!

2.The main difference in the structure of the current differential pressure instrument is the shut-off valve.
There is a simple instrument that uses a solenoid valve. This should be a product of the last century, so there are many shortcomings. When buying, ask what kind of valve the other party is. If it is a solenoid valve, it doesn’t matter where it is made, just say goodbye It works, but there are many problems)

There is another kind, which is the cylinder pressure valve. This technology is still available in imported Japanese machines, and some domestic companies also use it again, but not many can master its internal technology. Many products are demos when they do not borrow common parts. Okay, but there are often various unstable factors when connecting to the workpiece test.There is a kind of translation sealing valve commonly used in European and American instruments. The principle of this valve determines its stability and reliability.

3.The second is the sensor of the instrument. Some manufacturers advertise how high-precision their sensors are. In fact, the sensor is only an important part of the leak detector, but the reliability, repeatability and other design accuracy of the instrument have nothing to do with you. The valve body, software, and circuit have a lot to do with it. It is a good instrument if it is installed with an imported sensor. If so, the leak detector will have no technology at all. Choosing unsuitable devices everywhere can only increase costs for consumers.

4.Multi-channel leak detector. There are dual-channel leak detectors and multi-channel leak detectors on the market. This kind of instrument can test 2~4 workpieces at a time. It is a good solution for the current situation of high labor costs. Choice is also the development direction of the instrument market.

Tags：JL-X