How to handle situations encountered during testing in a programmable constant temperature and humidity test chamber

2024-10-18

How to handle situations encountered during testing in a programmable constant temperature and humidity test chamber

The handling of interruptions in programmable constant temperature and humidity test chambers is clearly defined in GJB 150, which considers three types of interruptions: interruptions within tolerance range, interruptions under under under test conditions, and interruptions under over test conditions. Different situations have different handling methods. For interruptions within the tolerance range, when the test conditions during the interruption period do not exceed the allowable error range, the interruption time should be considered as a part of the total test time; For the interruption of under test conditions, when the test conditions are below the lower limit of allowable error, the predetermined test conditions should be reached again from the point below the test conditions, and the test should be resumed until the predetermined test cycle is completed; Rework the test sample. If the test conditions do not directly affect the interruption of the test conditions, and if the test sample fails in future tests, the test result should be considered invalid. In practical work, we adopt the method of retesting after repairing the test sample for interruptions caused by faults in the test sample; For test interruptions caused by experimental equipment reasons (such as sudden water or power outages, equipment failures, etc.), if the interruption time is not very long (within 2 hours), we usually handle it according to the under test conditions specified in GJB 150. If the time is too long, the test must be redone. The reason for applying the regulation of interrupting the test in this way is determined by the regulation of stable temperature of the test sample.

The determination of the duration at the test temperature in temperature testing is often based on the sample reaching temperature stability at that temperature. Due to differences in product structure, materials, and testing equipment capabilities, the time it takes for different products to reach temperature stability at the same temperature varies. When the surface of the test sample is heated (or cooled) and gradually transferred to the interior of the test sample. This thermal conduction process is a stable thermal conduction process, and there is a time delay when the internal temperature of the test sample reaches thermal equilibrium compared to the time when the surface of the test sample reaches thermal equilibrium. This time delay is the temperature stabilization time. For test samples that cannot measure temperature stability, the minimum required time is specified. That is, when not in operation and unable to measure, the minimum temperature stability time is 3 hours. When in operation, the minimum temperature stability time is 2 hours. In practical work, we use 2 hours as the temperature stability time. When the test sample reaches temperature stability, if the temperature around the test sample suddenly changes, there is a corresponding time delay for the test sample in thermal equilibrium, that is, in a short period of time, the temperature inside the test sample will not change too much.

During the experiment, if there is a sudden water or power outage or equipment failure, we should first seal the test chamber door, because when the test equipment suddenly stops running, as long as the door is sealed, the temperature of the test chamber door will not change sharply. In a short period of time, the temperature inside the test sample will not change too much; Then, determine whether the interruption has affected the test sample. If it has not affected the test sample and the test equipment can resume normal operation in a short period of time, we can continue the test according to the under test condition interruption handling method specified in GJB 150, unless the interruption has caused some impact on the test sample.

Dear customer:

Hello, our company is a high-quality development team with strong technical strength, providing high-quality products, complete solutions, and excellent technical services to our customers. The main products include walk-in constant temperature and humidity testing chambers, UV accelerated aging testing machines, rapid temperature change testing chambers, walk-in environmental testing chambers, UV aging testers, constant temperature and humidity chambers, etc. Our company adheres to the principle of building a business with integrity, maintaining quality, and striving for progress. With a more determined pace, we continuously climb new heights and contribute to the national automation industry. We welcome new and old customers to confidently choose the products they like. We will serve you wholeheartedly!

PCT Test Purpose and Application (1)

2024-10-18

PCT Test Purpose and Application (1)

PCT test is generally known as pressure cooker cooking test or saturated steam test, the most important is to test the product to be tested under harsh temperature, saturated humidity (100%R.H.)[saturated water vapor] and pressure environment, test the high humidity resistance of the test product, for printed circuit board (PCB&FPC), used to carry out material moisture absorption test, high pressure cooking test... For the purpose of the test, if the product to be tested is a semiconductor, it is used to test the moisture resistance of the semiconductor package. The product to be tested is placed in a harsh temperature, humidity and pressure environment. If the semiconductor package is not good, moisture will penetrate into the package along the colloid or the interface between the colloid and the conductor frame. Popcorn effect, open circuit caused by corrosion of dynamic metallized area, short circuit caused by contamination between package pins... And other related issues.

Pressure Digester test (PCT) Structure:

The test chamber consists of a pressure vessel, including a water heater that can produce a 100% (wetting) environment. The different failures of the product to be tested after PCT test may be caused by a large amount of water vapor condensation and penetration.

Bathtub curve:

Bathtub curve (Bathtub curve, failure period), also known as bathtub curve, smile curve, mainly shows the failure rate of the product in different periods, mainly including early death period (early failure period), normal period (random failure period), wear period (degradation failure period), according to the reliability test box of environmental test. It can be divided into screening test, accelerated life test (durability test) and failure rate test. "Test design", "test execution" and "test analysis" should be considered as a whole when conducting reliability tests.

Common failure periods:

Early failure (early death, Infant Mortality Region) : imperfect production, defective materials, unsuitable environment, imperfect design. Random failure period (normal period, Useful Life Region) : external shock, misuse, changes in environmental conditions fluctuations, poor compression performance. Degradation failure period (Wearout Region) : oxidation, fatigue aging, performance degradation, corrosion.

Environmental stress and failure diagram description:

According to the statistical report of Hughes Airlines, the proportion of environmental stress caused by electronic products failure, height accounted for 2%, salt spray accounted for 4%, dust accounted for 6%, vibration accounted for 28%, and temperature and humidity accounted for up to 60%, so the impact of electronic products on temperature and humidity is particularly significant, but due to the traditional high temperature and humidity tests (such as: 40℃/90%R.H., 85℃/85%R.H., 60℃/95%R.H.) takes a long time, in order to speed up the material's hypersonic rate and shorten the test time, accelerated test equipment (HAST[High accelerated life testing machine], PCT[pressure pot]) can be used to carry out relevant tests. It is also called (degenerate failure period, wear period) test.

#Pressure Cooker Test Chamber #PCT Machine #PCT Chamber #Accelerated Pressure Aging Test Machine #Customized Aging Chamber #PCT CHAMBER for Pressure Cooker Test

Laptop Test Conditions

2024-10-18

Laptop Test Conditions

Notebook computer from the early 12-inch screen evolution to the current LED backlit screen, its computing efficiency and 3D processing, will not be lost to the general desktop computer, and the weight is becoming less and less burden, the relative reliability test requirements for the entire notebook computer is becoming more and more stringent, from the early packaging to the current boot down, the traditional high temperature and high humidity to the current condensation test. From the temperature and humidity range of the general environment to the desert test as a common condition, these are the parts that need to be considered in the production of notebook computer related components and design, the test conditions of the relevant environmental tests collected so far are organized and shared with you.

Keyboard tapping test:

Test one:

GB:1 million times

Key pressure :0.3~0.8(N)

Button stroke :0.3~1.5(mm)

Test 2: Key pressure: 75g(±10g) Test 10 keys for 14 days, 240 times per minute, a total of about 4.83 million times, once every 1 million times

Japanese manufacturers :2 to 5 million times

Taiwan manufacturer 1: more than 8 million times

Taiwan Manufacturer 2:10 million times

Power switch and connector plug pull test:

This test model simulates the lateral forces that each connector can withstand under abnormal usage. General laptop test items: USB, 1394, PS2, RJ45, Modem, VGA... Equal application force 5kg(50 times), up and down left and right pull and plug.

Power switch and connector plug test:

4000 times (Power supply)

Screen cover opening and closing test:

Taiwanese manufacturers: open and close 20,000 times

Japanese manufacturer 1: opening and closing test 85,000 times

Japanese manufacturer 2: opening and closing 30,000 times

System standby and recovery switch test:

General note type: interval 10sec, 1000cycles

Japanese manufacturer: System standby and recovery switch test 2000 times

Common causes of laptop failure:

☆ Foreign objects fall on the notebook

☆ Falls off the table while in use

☆ Tuck the notebook in a handbag or trolley case

☆ Extremely high temperature or low temperature ☆ Normal use (overuse)

☆ Wrong use in tourist destinations

☆PCMCIA inserted incorrectly

☆ Place foreign objects on the keyboard

Shutdown drop test:

General notebook type :76 cm

GB package drop: 100cm

Us Army and Japanese notebook computers: The height of the computer is 90 cm from all sides, sides, corners, a total of 26 sides

Platform :74 cm (packing required)

Land: 90cm (packing required)

TOSHIBA&BENQ 100 cm

Boot drop test:

Japanese :10 cm boot fall

Taiwan :74 cm boot fall

Laptop main board temperature shock:

Slope 20℃/min

Number of cycles 50cycles(no operation during impact)

The U.S. military's technical standards and test conditions for laptop procurement are as follows:

Impact test: Drop the computer 26 times from all sides, sides and corners at a height of 90 cm

Earthquake resistance test :20Hz~1000Hz, 1000Hz~2000Hz frequency once an hour X, Y and Z axis continuous vibration

Temperature test :0℃~60℃ 72 hours of aging oven

Waterproof test: Spray water on the computer for 10 minutes in all directions, and the water spray rate is 1mm per minute

Dust test: Spray the concentration of 60,000 mg/ per cubic meter of dust for 2 seconds (interval of 10 minutes, 10 consecutive times, time 1 hour)

Meets MIL-STD-810 military specifications

Waterproof test:

Us Army notebook :protection class:IP54(dust & rain) Sprayed the computer with water in all directions for 10 minutes at a rate of 1mm per minute.

Dust proof test:

Us Army notebook: Spray a concentration of 60,000 mg/ m3 of dust for 2 seconds (10 minute intervals, 10 consecutive times, time 1 hour)

Thermal Shock Test Chamber

#Thermal Shock Test Chamber #High and Low Temperature Test Chamber #Environment-friendly Test Chamber #Heating and Cooling Test Chamber #Hot and Cold Temperature Test Chamber #Constant Temperature Change Test Chamber

Introduction to the Solar Simulation Radiation Test Chamber

2024-10-18

Introduction to the Solar Simulation Radiation Test Chamber

The solar simulation irradiation test chamber, also known as the "solar radiation protection test device", is divided into three types according to the test standards and methods: air-cooled xenon lamp (LP/SN-500), water-cooled xenon lamp (LP/SN-500), and desktop xenon lamp (TXE). The difference lies in the temperature, humidity, accuracy, time, etc. of the test. It is an indispensable testing instrument in the aging test chamber series.

The test chamber uses an artificial light source combined with a G7 OUTDOOR filter to adjust the system light source to meet the requirements of IEC61646 for solar simulators by simulating the radiation in natural sunlight. The above system light source is used to conduct the IEC61646 photoaging test on the solar cell module, and the temperature on the back of the module needs to be constantly controlled between 50 ± 10oC during the test. Can automatically monitor temperature; Configure a radiometer to control the irradiance of light, ensuring it remains stable at a specified level, while also controlling the testing time.

During the ultraviolet light cycle period in the solar simulation irradiation test chamber, photochemical reactions are usually not sensitive to temperature. But the rate of any subsequent reaction depends on the temperature. The rate of these reactions accelerates with increasing temperature. Therefore, controlling the temperature during UV exposure is crucial. In addition, it is necessary to ensure that the temperature of the accelerated aging test is consistent with the highest temperature at which the material is directly exposed to sunlight. In the solar simulation irradiation test chamber, the UV exposure temperature can be set at any temperature between 50 ℃ and 80 ℃ based on the illuminance and ambient temperature. The UV exposure temperature is adjusted by a sensitive temperature controller and blower system to achieve excellent uniformity in the temperature of this test chamber.

Dear customer:

Hello, our company is a high-quality development team with strong technical strength, providing high-quality products, complete solutions, and excellent technical services to our customers. The main products include walk-in constant temperature and humidity testing chambers, UV accelerated aging testing machines, rapid temperature change testing chambers, walk-in environmental testing chambers, UV aging testers, constant temperature and humidity chambers, etc. Our company adheres to the principle of building a business with integrity, maintaining quality, and striving for progress. With a more determined pace, we continuously climb new heights and contribute to the national automation industry. We welcome new and old customers to confidently choose the products they like. We will serve you wholeheartedly!

#constant temperature and humidity chamber #walk-in constant temperature and humidity testing chamber #rapid temperature change testing chamber #walk-in environmental testing chamber #environmental chamber temperature humidity control #humidity test chamber

Structural characteristics of temperature and humidity control test chamber

2024-10-18

Structural characteristics of temperature and humidity control test chamber

Suitable for various small electrical appliances, instruments, materials, and components for wet heat testing, it is also suitable for conducting aging tests. This test chamber adopts the most reasonable structure and stable and reliable control method currently available, making it aesthetically pleasing, easy to operate, safe, and with high precision in temperature and humidity control. It is an ideal equipment for conducting constant temperature and humidity tests.

(1) The test box body is in the form of an integral structure, with the refrigeration system located at the lower rear of the box and the control system located at the upper part of the test box.

(2) Inside the air duct interlayer at one end of the studio, there are devices such as heaters, refrigeration evaporators, and fan blades distributed; On the left side of the test box, there is a Ø 50 cable hole, and the test box is a single door (stainless steel embedded door handle)

(3) The double-layer high temperature and anti-aging silicone rubber seal can effectively ensure the temperature loss of the test chamber

(4) There are observation windows, frost prevention devices, and switchable lighting fixtures on the box door. The observation window adopts multi-layer hollow tempered glass, and the inner adhesive sheet conductive film is heated and defrosted. The lighting fixtures adopt imported brand Philips lamps, which can effectively observe the experimental changes in the studio from all angles.

The refrigeration cycle of the temperature and humidity control box adopts the reverse Carnot cycle, which consists of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is adiabatically compressed to a higher pressure by the compressor, and the work consumed increases the exhaust temperature. Then, the refrigerant exchanges heat with the surrounding medium through the condenser and transfers heat to the surrounding medium. After the refrigerant undergoes adiabatic expansion through the shut-off valve, the temperature of the refrigerant decreases. Finally, the refrigerant absorbs heat from the object at a higher temperature through the evaporator, causing the temperature of the cooled object to decrease. This cycle repeats itself to achieve the goal of cooling down.

The refrigeration system design of this test chamber applies energy regulation technology, which can ensure the normal operation of the refrigeration unit and effectively adjust the energy consumption and refrigeration capacity of the refrigeration system, so as to maintain the refrigeration system in the optimal operating state. By using Balanced Temperature Control (BTC), the control system automatically calculates the output of the heater based on the set temperature point through PID calculation when the refrigeration system is working continuously, ultimately achieving a dynamic balance.

Dear customer:

Hello, our company is a high-quality development team with strong technical strength, providing high-quality products, complete solutions, and excellent technical services to our customers. The main products include walk-in constant temperature and humidity testing chambers, UV accelerated aging testing machines, rapid temperature change testing chambers, walk-in environmental testing chambers, UV aging testers, constant temperature and humidity chambers, etc. Our company adheres to the principle of building a business with integrity, maintaining quality, and striving for progress. With a more determined pace, we continuously climb new heights and contribute to the national automation industry. We welcome new and old customers to confidently choose the products they like. We will serve you wholeheartedly!

#Hot And Cold Temperature #Temperature Cycling Test Chamber #Reliable Temperature And Humidity Test Machine #Programmable Constant Temperature And Humidity Test Chambers #High temperature aging chamber #Constant Temperature Test Chambe

Precision Oven Manual

2024-10-18

Precision Oven Manual

Precision ovens are suitable for semiconductor devices in the electronic industry, curing and aging of electronic components, high-temperature precision testing of plastic and rubber, molding processes for telephone handle wires, as well as experimental or workshop production lines in higher education research institutions and industrial and mining enterprises that require high product temperatures.

This instrument is equipped with a two-level temperature control system, dual protection, automatic cut-off for overheating, safe and reliable. The column alarm device has a temperature rise and constant temperature light display. When using this instrument in large quantities in the production workshop, which instrument has reached the constant temperature requirement and which one is still in the heating state can be clearly seen.

The instrument liner is made of high-quality mirror stainless steel, the outer shell is sprayed with plastic, and a safety door lock is installed. The front door adopts a high-temperature resistant glass observation window, which can observe the condition of the test piece inside the box at any time.

Dear customer:

Our company has products such as rapid temperature change test chambers, UV accelerated weather resistance testing machines, and temperature and humidity control chambers. You can call our service hotline through our website to learn more about our products. Our pursuit is endless, and we welcome new and old customers to choose their favorite products with confidence. We will be dedicated to serving you!

#Constant Temperature Test Chamber #Humidity Freezing Test Equipment #Test Equipment Walk-in Constant Temperature And Humidity Test Chambers #High temperature aging chamber #Industrial oven #Hot air drying oven

Service conditions for high, low temperature, and low pressure test chambers

2024-10-18

Service conditions for high, low temperature, and low pressure test chambers

One of the usage conditions for high, low temperature, and low pressure test chambers: environmental conditions

a、 Temperature: 15 ℃~35 ℃;

b、 Relative humidity: not exceeding 85%;

c、 Atmospheric pressure: 80kPa~106kPa

d、 There is no strong vibration or corrosive gas in the surrounding area;

e、 No direct sunlight exposure or direct radiation from other cold or heat sources;

f、 There is no strong airflow around, and when the surrounding air needs to be forced to flow, the airflow should not be directly blown onto the box;

g、 The influence of magnetic field on the control circuit of the interference free test box in the surrounding area;

h、 There is no high concentration of dust or corrosive substances in the surrounding area.

Condition 2 for the use of high, low temperature, and low pressure test chambers: Power supply conditions

a、 AC voltage: 220V ± 22V or 380V ± 38V;

b、 Frequency: 50HZ ± 0.5HZ

Condition Three for the Use of High, Low Temperature, and Low Pressure Test Chambers: Water Supply Conditions

It is advisable to use tap water or circulating water that meets the following conditions:

a、 Water temperature: not higher than 30 ℃;

b、 Water pressure: 0.1MPa~0.3MPa;

c、 Water quality: meets industrial water standards.

Condition 4 for the use of high, low temperature, and low pressure test chambers: Test load conditions

The load of the test chamber should meet the following conditions every week:

a、 The total mass of the load shall not exceed 80KG per cubic meter within the working chamber volume

b、 The total volume of the load shall not exceed 5/1 of the working chamber volume

c、 On any cross-section perpendicular to the prevailing wind direction, the sum of the load areas should not exceed 3/1 of the cross-sectional area of the working chamber at that location, and the load should not obstruct the flow of airflow when placed.

Dear customer:

Our company has products such as rapid temperature change test chambers, UV accelerated weather resistance testing machines, and temperature and humidity control chambers. You can call our service hotline through our website to learn more about our products. Our pursuit is endless, and we welcome new and old customers to choose their favorite products with confidence. We will be dedicated to serving you!

#Temperature Change Test Chamber #Constant Temperature Test Chamber #Humidity Freezing Test Equipment #Temperature Cycling Test Chamber #Programmable Constant Temperature And Humidity Test Chambers

The development prospects of high and low temperature wet heat test chambers are promising

2024-10-18

The development prospects of high and low temperature wet heat test chambers are promising

Nowadays, China's environmental testing equipment industry is rapidly developing, constantly innovating and surpassing. However, compared to the international level, China has only reached the technical level of the mid-1990s. The development of modern industrial testing equipment not only depends on the level of product technology, but also involves engineering application technology. But many products in our country have already reached the level of international mainstream products, with a wide variety, complete specifications, low prices, and are very competitive in the international market; For example, the high and low temperature wet heat test chamber has reached the international product level.

The high and low temperature damp heat test chamber in China has done very well both in terms of product reliability and product precision. Now the test chamber in China is becoming more and more intelligent and integrated into the Internet. As long as you have a computer, you can control it anywhere and anytime; And the price is relatively cheaper compared to foreign countries, with the same quality but different prices. However, it is still necessary to constantly innovate technological indicators, constantly surpass oneself, and become a leader in environmental testing equipment. From the current perspective, the development path of high and low temperature wet heat test chambers is bright.

On the other hand, China's environmental testing equipment industry is accelerating from laboratories to the forefront of production, and to people's homes and lives. Portable, handheld, and personalized instruments are developing in large numbers, and commodity testing, environmental testing, and health testing have become new demand hotspots; The current trend in the development of instruments and meters is on the rise. It is believed that soon, China's leading product in the environmental testing industry, the high and low temperature wet heat test chamber, will be far ahead in terms of technology, brand, and other aspects internationally.

Dear customer:

Hello, our company is a high-quality development team with strong technical strength, providing high-quality products, complete solutions, and excellent technical services to our customers. The main products include walk-in constant temperature and humidity testing chambers, UV accelerated aging testing machines, rapid temperature change testing chambers, walk-in environmental testing chambers, UV aging testers, constant temperature and humidity chambers, etc. Our company adheres to the principle of building a business with integrity, maintaining quality, and striving for progress. With a more determined pace, we continuously climb new heights and contribute to the national automation industry. We welcome new and old customers to confidently choose the products they like. We will serve you wholeheartedly!

#Constant Temperature Test Chamber #Hot And Cold Temperature #Temperature and Humidity Chamber #Temperature Cycling Test Chamber #Programmable Constant Temperature And Humidity Test Chambers #High temperature aging chamber

PCT Test Purpose and Application (2)

2024-10-18

PCT Test Purpose and Application (2)

θ 10℃ rule:

When discussing product life, the expression of [θ10℃ rule] is generally used, and a simple explanation can be expressed as [10℃ rule], when the ambient temperature rises by 10℃, the product life will be reduced by half; When the ambient temperature rises by 20 ° C, the product life will be reduced to a quarter. This rule can explain how the temperature affects the life of the product (failure), the opposite product reliability test, can also be used to increase the ambient temperature to accelerate the failure phenomenon, a variety of accelerated life aging tests.

Causes of failure caused by moisture:

Water vapor infiltration, polymer material depolymerization, reduced polymer bonding ability, corrosion, cavitation, wire solder joint detachment, leakage between leads, wafer and wafer bonding layer detachment, pad corrosion, metallization, or short circuit between leads. Effect of water vapor on the reliability of electronic packaging: corrosion failure, delamination and cracking, changing the properties of plastic sealing materials.

PCT failure mode for PCB:

Blister, Crack, SR de-lamination.

PCT testing of semiconductors:

PCT is mainly to test the moisture resistance of semiconductor packaging, the product to be tested is placed in a harsh temperature and humidity and pressure environment test, if the semiconductor packaging is not good, moisture will penetrate into the package along the colloidal or colloidal and wire frame interface into the package, common reasons for installation: Popcorn effect, open circuit caused by corrosion of dynamic metallized area, short circuit caused by contamination between package pins... And other related issues.

PCT reliability assessment for IC semiconductors:

DA Epoxy, wire frame material, sealing resin corrosion failure and IC: corrosion failure (water vapor, bias, impurity ions) will cause electrochemical corrosion of IC aluminum wire, resulting in open circuit and migration growth of aluminum wire.

Failure phenomena caused by moisture corrosion of plastic-sealed semiconductors:

Because aluminum and aluminum alloys are cheap and simple to process, they are usually used as metal wires for integrated circuits. From the beginning of the integrated circuit molding process, water and gas will penetrate through epoxy resin to cause corrosion of aluminum metal wires and thus open circuit phenomenon, which becomes the most headache for quality management. Although various efforts have been made to improve product quality through various improvements, including the use of different epoxy resin materials, improved plastic sealing technology and the improvement of inactive plastic sealing film, with the rapid development of miniaturization of semiconductor electronic devices, the corrosion problem of plastic sealed aluminum metal wire is still a very important technical topic in the electronics industry.

Corrosion process in aluminum wire:

① Water permeates into the plastic sealing shell → moisture permeates into the gap between the resin and the wire

② Water permeates the surface of the wafer to cause aluminum chemical reaction

Factors that accelerate aluminum corrosion:

① The connection between the resin material and the wafer frame interface is not good enough (due to the difference in expansion rate between various materials)

② When packaging, the packaging material is contaminated with impurities or impurity ions (due to the appearance of impurity ions)

③ The high concentration of phosphorus used in the inactive plastic encapsulation film

(4) Defects in inactive plastic encapsulation film

The Popcorn Effect:

The original refers to the IC encapsulated in the plastic outer body, because the silver paste used in the wafer installation will absorb water, once the plastic body is sealed without prevention, when the downstream assembly and welding encounter high temperature, the water will burst due to the vaporization pressure, and it will also emit a sound like popcorn, so it is named, when the absorbed water vapor content is higher than 0.17%, The [popcorn] phenomenon will occur. Recently, P-BGA packaging components are very popular, not only the silver glue will absorb water, but also the substrate of the serial board will absorb water, and the popcorn phenomenon often occurs when the management is not good.

Pressure Cooker Test Chamber

#Pressure Cooker Test Chamber #PCT Machine #PCT Chamber #Accelerated Pressure Aging Test Machine #Customized Aging Chamber #PCT CHAMBER for Pressure Cooker Test

UV accelerated aging testing machine with humid condensation environment and water spray system

2024-10-18

UV accelerated aging testing machine with humid condensation environment and water spray system

In many outdoor environments, materials can be kept moist for up to 12 hours per day. Research has shown that the main factor causing outdoor humidity is dew, not rainwater. GUV simulates outdoor moisture erosion through its unique condensation function. In the condensation cycle during the experiment, the water in the reservoir at the bottom of the testing chamber is heated to generate hot steam, which fills the entire testing chamber. The hot steam maintains the relative humidity in the testing chamber at 100% and maintains a relatively high temperature. The sample is fixed on the side wall of the testing chamber, so that the testing surface of the sample is exposed to the ambient air inside the testing chamber. The outward side of the sample exposed to the natural environment has a cooling effect, resulting in a temperature difference between the inner and outer surfaces of the sample. The occurrence of this temperature difference causes the sample to always have liquid water generated by condensation on its testing surface throughout the entire condensation cycle.

Due to outdoor exposure to moisture for up to ten hours a day, a typical condensation cycle typically lasts for several hours. GUV provides two methods for simulating humidity. The most commonly used method is condensation, which is the best way to simulate outdoor moisture erosion. All GUV models are capable of running condensation cycles. Because some application conditions also require the use of water spray to achieve practical results, some GUV models can operate both condensation cycle and water spray cycle.

For certain applications, water spray can better simulate the environmental conditions of final use. Water spraying is very effective in simulating thermal shock or mechanical erosion caused by temperature fluctuations and rainwater erosion. Under certain practical application conditions, such as sunlight, when the accumulated heat rapidly dissipates due to sudden showers, the temperature of the material will undergo a sharp change, resulting in thermal shock, which is a test for many materials. GUV's water spray can simulate thermal shock and/or stress corrosion. The spray system has 12 nozzles, with 6 on each side of the testing room; The sprinkler system can run for a few minutes and then shut down. This short-term water spray can quickly cool the sample and create conditions for thermal shock.

Dear customer:

Hello, our company is a high-quality development team with strong technical strength, providing high-quality products, complete solutions, and excellent technical services to our customers. The main products include walk-in constant temperature and humidity testing chambers, UV accelerated aging testing machines, rapid temperature change testing chambers, walk-in environmental testing chambers, UV aging testers, constant temperature and humidity chambers, etc. Our company adheres to the principle of building a business with integrity, maintaining quality, and striving for progress. With a more determined pace, we continuously climb new heights and contribute to the national automation industry. We welcome new and old customers to confidently choose the products they like. We will serve you wholeheartedly!

#Temperature Change Test Chamber #Temperature Cycling Test Chamber #Reliable Temperature And Humidity Test Machine #UV accelerated aging testing machines #walk-in constant temperature and humidity testing chambers #rapid temperature change testing chambers