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• The Applicability of Temperature Test Chambers to the Testing of Household Environmental Products

  Oct 18, 2025

  A variety of products used in home environments (more common test objects) such as televisions, air conditioners, refrigerators, washing machines, smart speakers, routers, etc., as well as environmental protection products used to improve the home environment: such as air purifiers, fresh air systems, water purifiers, humidifiers/dehumidifiers, etc. No matter which category it is, as long as it needs to work stably for a long time in a home environment, it must undergo strict environmental reliability tests. The high and low temperature test chamber is precisely the core equipment for accomplishing this task.   The home environment is not always warm and pleasant, and products will face various harsh challenges in actual use. This mainly includes regional climate differences, ranging from the severe cold in Northeast China (below -30°C) to the scorching heat in Hainan (up to over 60°C in the car or on the balcony). High-temperature scenarios such as kitchens close to stoves, balconies exposed to direct sunlight, and stuffy attics, etc. Or low-temperature scenarios: warehouses/balconies without heating in northern winters, or near the freezer of refrigerators. The high and low temperature test chamber, by simulating these conditions, "accelerates" the aging of products in the laboratory and exposes problems in advance.   The actual test cases mainly cover the following aspects: 1. The smart TV was continuously operated at a high temperature of 55°C for 8 hours to test its heat dissipation design and prevent screen flickering and system freezing caused by overheating of the mainboard. 2. For products with lithium batteries (such as cordless vacuum cleaners and power tools), conduct charge and discharge cycles at -10°C to assess the battery performance and safety at low temperatures and prevent over-discharge or fire risks. 3. The air purifier (with both types of "environmental product" attributes) undergoes dozens of temperature cycles between -20°C and 45°C to ensure that its plastic air ducts, motor fixing frames and other structures will not crack or produce abnormal noises due to repeated thermal expansion and contraction. 4. Smart door lock: High-temperature and high-humidity test (such as 40°C, 93%RH) to prevent internal circuits from getting damp and short-circuited, which could lead to fingerprint recognition failure or the motor being unable to drive the lock tongue.   High and low temperature test chambers are not only applicable but also indispensable for the testing of household environmental products. By precisely controlling temperature conditions, it can ensure user safety and prevent the risk of fire or electric shock caused by overheating or short circuits. Ensure that the product can work stably in different climates and home environments to reduce after-sales malfunctions. And it can predict the service life of the product through accelerated testing. Therefore, both traditional home appliance giants and emerging smart home companies will take high and low temperature testing as a standard step in their product development and quality control processes.

  hot Tags : High and Low Temperature Test Chamber High and Low Temperature Humidity Test Chamber Cold and Hot Environment Test Chamber Low Humidity Environment Test Chamber High Temperature Aging Test Chamber Reliability Testing Equipment

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• Lab Aging Test Chamber Working Principle

  Oct 17, 2025

  Many products (such as rubber, plastic, insulating materials, electronic components, etc.) will age due to the combined effects of heat and oxygen when exposed to the natural environment over a long period of use, such as becoming hard, brittle, cracking, and experiencing a decline in performance. This process is very slow in its natural state. The air-exchange aging test chamber greatly accelerates the aging process by creating a continuously high-temperature environment and constantly replenishing fresh air in the laboratory, thereby evaluating the long-term heat aging resistance of materials in a short period of time.   The working principle of Lab aging test chamber mainly relies on the collaborative efforts of three systems: 1. The heating system provides and maintains a high-temperature environment inside the test chamber. High-performance electric heaters are usually adopted and installed at the bottom, back or in the air duct of the test chamber. After the controller sets the target temperature (for example, 150°C), the heater starts to work. The air is blown through the heater by a high-power fan. The heated air is forced to circulate inside the box, causing the temperature inside the box to rise evenly and remain at the set value. 2. The ventilation system is the key that distinguishes it from ordinary ovens. At high temperatures, the sample will undergo an oxidation reaction with oxygen in the air, consuming oxygen and generating volatile products. If the air is not exchanged, the oxygen concentration inside the box will decrease, the reaction will slow down, and it may even be surrounded by the products of the sample's own decomposition. This is inconsistent with the actual usage of the product in a naturally ventilated environment. 3. The control system precisely controls the parameters of the entire testing process. The PID (Proportional-integral-Derivative) intelligent control mode is adopted. The real-time temperature is fed back through the temperature sensor inside the box (such as platinum resistance PT100). The controller precisely adjusts the output power of the heater to ensure that the temperature fluctuation is extremely small and remains stable at the set value. Set the air exchange volume within a unit of time (for example, 50 air changes per hour). This is one of the core parameters of the air-exchange aging test chamber, which usually follows relevant test standards (such as GB/T, ASTM, IEC, etc.).   The test chamber creates a high-temperature environment through electric heaters, achieves uniform temperature inside the box by using centrifugal fans, and continuously expels exhaust gases and draws in fresh air through a unique ventilation system. Thus, under controllable experimental conditions, it simulates and accelerates the aging process of materials in a naturally ventilated thermal and oxygen environment. The biggest difference between it and a common oven lies in its "ventilation" function, which enables its test results to more truly reflect the heat aging resistance of the material during long-term use.

  hot Tags : Temperature Test Chamber Aging Test Chamber Precision Oven Drying Test Chamber Weathering Test Chamber Aging Test Equipment

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• Lab Thermal Resistance Sensing Core Working Principle

  Oct 16, 2025

  The core of the thermal resistance induction in high and low temperature test chambers also utilizes the physical property that the resistance value of platinum metal changes with temperature. The core logic of the control system is a closed-loop feedback control: measurement → comparison → regulation → stability   Firstly, the thermal resistance sensor senses the current temperature inside the chamber and converts it into a resistance value. The measurement circuit then converts the resistance value into a temperature signal and transmits it to the controller of the test chamber. The controller compares this measured temperature with the target temperature set by the user and calculates the deviation value. Subsequently, the controller outputs instructions to the actuator (such as the heater, compressor, liquid nitrogen valve, etc.) based on the magnitude and direction of the deviation. If the measured temperature is lower than the target temperature, start the heater to heat up; otherwise, start the refrigeration system to cool down. Through such continuous measurement, comparison and adjustment, the temperature inside the box is eventually stabilized at the target temperature set by the user and the required accuracy is maintained.   Due to the fact that high and low temperature test chambers need to simulate extreme and rapidly changing temperature environments (such as cycles from -70°C to +150°C), the requirements for thermal resistance sensors are much higher than those for ordinary industrial temperature measurement.   Meanwhile, there is usually more than one sensor inside the high and low temperature test chamber. The main control sensor is usually installed in the working space of the test chamber, close to the air outlet or at a representative position. It is the core of temperature control. The controller decides on heating or cooling based on its readings to ensure that the temperature in the working area meets the requirements of the test program. The monitoring sensors may be installed at other positions inside the box to verify with the main control sensors, thereby enhancing the reliability of the system. Over-temperature protection is independent of the main control system. When the main control system fails and the temperature exceeds the safety upper limit (or lower limit), the monitoring sensor will trigger an independent over-temperature protection circuit, immediately cutting off the heating (or cooling) power supply to protect the test samples and equipment safety. This is a crucial safety function.   Lab thermal resistance sensor is a precision component that integrates high-precision measurement, robust packaging, and system safety monitoring. It serves as the foundation and "sensory organ" for the entire test chamber to achieve precise and reliable temperature field control.

  hot Tags : High Temperature Test Chamber Low Temperature Test Chamber Thermal Shock Test Chamber Programmable Temperature Test Chamber Precision Oven Intelligent Testing Instruments

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• Cascade Compression Refrigeration Working Principle

  Oct 15, 2025

  Cascade compression refrigeration mainly consists of two independent refrigeration cycles and a heat exchanger connected to them. The high-temperature stage recycles medium-temperature refrigerants, high-temperature stage compressors, high-temperature stage condensers, expansion valves, and evaporative condensers. The low-temperature stage recycles components such as low-temperature refrigerants, low-temperature stage compressors, and expansion valves.   The work mainly includes four processes: compression, condensation, throttling and evaporation. Low-temperature stage cycle: The low-temperature refrigerant is compressed in the low-temperature stage compressor, with its pressure and temperature increasing. The high-temperature and high-pressure low-temperature refrigerant vapor then enters the evaporative condenser. Here, it is not cooled by ambient air or cooling water, but by the refrigerant liquid that evaporates and absorbs heat in the high-temperature stage cycle, thereby releasing heat and condensing into a high-pressure liquid. This is the core of the cascade system! Subsequently, the high-pressure low-temperature refrigerant liquid passes through the low-temperature stage throttling valve, where the pressure drops sharply, transforming into a low-temperature and low-pressure gas-liquid two-phase mixture. This gas-liquid mixture enters the low-temperature stage evaporator, absorbing the heat of the object to be cooled (such as the heat inside the freezer), and completely evaporates into low-temperature and low-pressure vapor, thereby achieving the purpose of refrigeration. The low-temperature and low-pressure vapor after evaporation is once again drawn into the low-temperature stage compressor to complete the cycle. 2. High-temperature stage cycle: The high-temperature refrigerant is compressed in the high-temperature stage compressor, with its pressure and temperature increasing. The high-temperature and high-pressure refrigerant vapor enters the condenser (usually cooled by air or water), releasing heat to the ambient medium and condensing into a high-pressure liquid. The high-temperature refrigerant liquid under high pressure passes through the high-temperature stage throttling valve, causing a sudden drop in pressure and transforming into a medium-temperature and low-pressure gas-liquid two-phase mixture. The mixture enters the evaporative condenser, absorbing the heat released by the refrigerant vapor from the low-temperature stage cycle (i.e., serving as the cold source for the low-temperature stage), and evaporates into low-pressure vapor. The low-pressure vapor after evaporation is once again drawn into the high-temperature stage compressor to complete the cycle.   Cascade refrigeration can reach a temperature range of -60°C to -150° C. Each stage of the cycle operates within its own reasonable compression ratio range, ensuring high compressor efficiency and reliable operation. Compared with the single-stage cycle that barely achieves low temperatures, the cascade system has a higher energy efficiency ratio under the design conditions. At the same time, it avoids problems such as excessively high exhaust temperature and deterioration of lubricating oil in single-stage systems at high compression ratios, and enables the selection of the most suitable refrigerants for the temperature zones of the high and low-temperature stages respectively.

  hot Tags : Two Chambers of Thermal Shock Test Chamber Three-chamber Thermal Shock Test Chamber Basket Impact Test Chamber Thermal Shock Equipment High and Low Temperature Testing Experiment High and Low Temperature Test Chamber Equipment Refrigeration

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• The Function of Adding Nitrogen Input to Industrial Ovens

  Oct 14, 2025

  The core function of adding nitrogen input in industrial ovens is to create an inert atmosphere environment with low oxygen or no oxygen. This is usually referred to as "nitrogen protection" or "nitrogen-filled baking".   Preventing oxidation is the most common and primary purpose. When heated in the air (with an oxygen content of approximately 21%), many materials will undergo oxidation reactions, thereby affecting product quality. Adding nitrogen input to industrial ovens can prevent the formation of oxide scale (such as rust) on the surface of metal products during heating, keep the metal bright and clean, and improve the quality of subsequent processes such as electroplating and spraying. Or to prevent the oxidation of component pins, pads and precision films at high temperatures, ensuring the quality of soldering and the long-term reliability of the product. At the same time, it can also prevent chemical and powder materials from undergoing chemical reactions with oxygen at high temperatures, thereby altering their chemical properties. 2. Some materials pose a risk of fire or explosion in high-temperature and oxygen-rich environments. Increasing nitrogen input can suppress combustion and explosion. In industries such as printing and coating, a large amount of flammable organic solvents (such as alcohol, acetone, and toluene) are volatilized during the baking process. Introducing nitrogen to reduce the oxygen concentration below the limit oxygen concentration can completely eliminate the risk of fire and explosion, which is an important safety measure. For metal and plastic powders, when they reach a certain concentration in the air, they are highly prone to explosion when exposed to open flames or high temperatures. Nitrogen protection can create a safe processing environment. 3. Improve process control and product quality. Heating in an oxygen-free or low-oxygen environment can avoid many side reactions caused by oxygen. In processes such as chip manufacturing and solar cell production, extremely high cleanliness and an oxygen-free environment are essential to prevent the oxidation of silicon wafers, metal electrodes, etc., ensuring extremely high product yield and performance. 4. While filling the oven with nitrogen, the air that originally contained moisture and oxygen inside the oven will also be "driven out". This not only prevents oxidation but also plays an auxiliary drying role, making it particularly suitable for products that are extremely sensitive to moisture.   In conclusion, adding nitrogen input to industrial ovens is to actively control the heating environment rather than passively heating in the air. This is an important technical means used in high-end manufacturing and precision processing.

  hot Tags : Industrial Oven Vacuum Oven Dust-free Oven Hot Air Circulation Oven Explosion-proof Oven Experimental Drying Oven

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• Lab Dust Free Oven Environmental Test Condition

  Oct 11, 2025

  Internal environmental conditions Benchmark cleanliness: At the beginning of the test, the chamber must reach the highest cleanliness level it claims (such as ISO Class 5 / Class 100). This is the premise of all tests. Before the test, the oven needs to run a long period of "self-cleaning" until the particle count shows that the concentration is stable below the standard for multiple consecutive times. Temperature and Humidity: Although the oven is a heating device, its initial state needs to be clearly defined. The initial environment for testing is usually normal temperature and humidity, for example, a temperature of 20±5°C and a relative humidity of 30-60% RH. This is crucial for testing the heating time and temperature uniformity. If the process has requirements for the dew point of the environment, it may be necessary to record the initial absolute humidity. Airflow state: The test should be conducted under the specified airflow pattern, typically in a vertical or horizontal laminar flow state. The fan must operate at the rated speed, with stable air pressure and air volume. Test load: The test is divided into two conditions: no-load and full-load. No-load is the benchmark test for equipment performance. Fill the effective working space with a fully loaded simulated load (such as metal, pallets, etc.) to simulate the harshest working conditions. Full-load testing can truly reflect the impact of products on air flow and temperature fields in actual production.   External environmental conditions 1. The cleanliness level of the external environment must be lower than or equal to the cleanliness level designed by the oven itself. For instance, when testing an oven of Class 100, it is best to do it in a room of Class 1000 or cleaner. If the external environment is too dirty, it will seriously interfere with the measurement results of the internal cleanliness of the oven when opening and closing the door or when water seeps through gaps. 2. The laboratory requires a stable temperature and humidity environment. It is generally recommended to conduct the test under standard laboratory conditions, such as 23±2°C and 50±10% RH. Avoid testing in extreme or highly volatile environments. 3. The test area should be free of strong convective winds and it is best to maintain a slight positive pressure to prevent external contaminants from entering the test area. 4. The power supply voltage and frequency should be stable within the range required by the equipment. 5. The equipment should be placed on a ground or base with less vibration. There are no large stamping equipment, fans or other strong vibration sources around.   When testing a dust-free oven, controlling the external environment is as important as measuring the internal environment. An unstable, dirty or strongly interfering external environment can lead to distorted test data and fail to truly reflect the performance of the equipment. All test conditions should be clearly recorded in the final verification report to ensure the traceability and repeatability of the tests.

  hot Tags : Industrial Oven Environmental Testing Equipment Precision Oven Dust Free Oven Clean Oven Industrial Clean Oven

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• Walk-in Temperature Test chambers Packaging and transportation Requirements

  Oct 08, 2025

  Before designing a packaging and transportation plan, it is necessary to first understand the characteristics of the equipment and the potential risks it faces: Firstly, the equipment is usually large in size (tens of cubic meters) and can weigh several tons. This determines that its transportation falls within the category of large item logistics. Meanwhile, the foam insulation layer of the box body is vulnerable to bumps and cuts, and the surface spraying is afraid of scratches and depressions. Refrigeration units such as compressors, evaporators and condensers are afraid of severe vibration and tilting. The electrical control system and sensors are afraid of shock, etc.   To address the above challenges, foam blocks, pearl cotton and other fillers must be used inside the equipment to fix the sample racks, air ducts and other movable parts to prevent them from shaking and colliding inside the box. The door must be locked from the inside with a special lock or strap to prevent it from opening and closing during transportation. Usually, cushioning materials are placed at the door gap to prevent the door from directly hitting the door frame. The main packaging is the most crucial part. It is recommended to adopt a multi-layer protective structure, such as moisture-proof and dust-proof, cushioning protection, as well as wooden box frame and external protection.   The transportation plan mainly includes The first choice for domestic land transportation is flatbed trucks. It is convenient for top hoisting and side loading and unloading, and is suitable for extra-wide and extra-high goods. The second choice is a box van, which can offer better protection against rain and dust, but it is necessary to ensure that the internal dimensions and load-bearing capacity are sufficient. But the key lies in the fact that airbag vehicles or air-suspended vehicles must be used to maximize shock absorption. 2. Sea transportation is the most commonly used in international transportation. The equipment packaging must be able to withstand the jolts, humidity and salt spray environment inside the container. It is recommended to use a 40-foot super high cabinet. When necessary, place desiccants inside the container. Air freight is extremely costly and is only suitable for urgent or ultra-short lead time projects. There are strict restrictions on the weight and size of the packaging. 3. Loading and unloading must be carried out using cranes or forklifts. It is strictly prohibited to directly fork at the equipment body. The technical specifications of the equipment usually clearly specify the maximum tilt Angle (such as 15° or 30°). Strict compliance must be maintained during transportation and handling; otherwise, it may lead to compressor damage or refrigerant leakage. Finally, it is necessary to confirm the on-site passage dimensions, ground load-bearing capacity and elevator capacity with the customer in advance, and formulate a detailed positioning plan.   The packaging and transportation of walk-in temperature test chambers is essentially a professional task that treats industrial equipment as "precision goods". Any negligence in any link may lead to huge economic losses and project delays. Therefore, investing sufficient resources and efforts in the packaging and transportation plan is a key prerequisite for ensuring the safe arrival and smooth operation of the equipment.

  hot Tags : Walk-in Environmental Test Chamber Environmental Testing Equipment Walk-in High and Low Temperature Test Chamber Walk-in Artificial Climate Chamber Large-scale Environmental Testing Chamber Walk-in Constant Temperature and Humidity Chamber

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• The Principle of Balancing the Temperature inside the Test Chamber by the Air Valve

  Sep 22, 2025

  Its core principle is a closed-loop negative feedback system of "heating - measurement - control". In simple terms, it is to precisely control the power of the heating elements inside the box to counteract the heat dissipation caused by the external environment, thereby maintaining a constant test temperature that is higher than the ambient temperature. The process by which the air valve stabilizes the temperature is a dynamic and continuously adjusting closed loop:   First, set a target temperature. The temperature sensor measures the actual temperature inside the box in real time and transmits the signal to the PID controller. When the PID controller calculates the error value, it calculates the heating power that needs to be adjusted based on the error value through the PID algorithm. The algorithm will take into account three factors P (proportion) : How large is the current error? The greater the error, the greater the adjustment range of the heating power. I (integral) : The accumulation of errors over a certain period of time. It is used to eliminate static errors (for example, if there is always a slight deviation, the integration term will gradually increase the power to completely eliminate it). D (differential) : The rate of change of the current error. If the temperature is rapidly approaching the target, it will reduce the heating power in advance to prevent "overshoot". 3. The PID controller sends the calculated signal to the power controller of the heating element (such as a solid-state relay SSR), precisely regulating the voltage or current applied to the heating wire, thereby controlling its heat generation. 4. The circulating fan works continuously to ensure that the heat generated by heating is distributed rapidly and evenly. At the same time, it also quickly feeds back the signal changes of the temperature sensor to the controller, making the system response more timely.   The air valve balancer measures air volume, while the density of air varies with temperature. Under the same differential pressure value, the mass flow rate or volume flow rate corresponding to air of different densities is different. Therefore, the temperature must be stabilized at a known fixed value so that the microprocessor inside the instrument can accurately calculate the air volume value under standard conditions based on the measured differential pressure value using the preset formula. If the temperature is unstable, the measurement results will be unreliable.  

  hot Tags : High and Low Temperature Test Chamber Constant Temperature and Humidity Chamber Temperature Testing Equipment Environmental Simulation Test Chamber Core Components of Test Chamber High and Low Temperature Balance

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• Building a Safe Test Chamber Test Environment

  Sep 16, 2025

  The key to creating a safe testing environment for the Lab high and low temperature test chamber lies in ensuring personal safety, equipment safety, test piece safety and data accuracy. 1.Personal Safety Considerations Before opening the high-temperature chamber door to take out the sample, it is necessary to wear the high and low temperature resistant protective equipment properly. When performing operations that may cause splashing or the leakage of extremely hot/cold gases, it is recommended to wear a protective face mask or goggles. The test chamber should be installed in a well-ventilated laboratory and avoid operating in a confined small space. High-temperature testing may release volatile substances from the test piece. Good ventilation can prevent the accumulation of harmful gases. Ensure that the power cord specifications meet the equipment requirements and the grounding wire must be reliably connected. Most importantly, it is strictly forbidden to touch power plugs, switches and samples with wet hands to prevent electric shock.   2. Install the equipment correctly The minimum safety distance specified by the manufacturer (usually at least 50-100 centimeters) must be left on the back, top and both sides of the equipment to ensure the normal operation of the condenser, compressor and other heat dissipation systems. Poor ventilation can cause equipment to overheat, performance decline and even fire. It is recommended to provide a dedicated power line for the test chamber to avoid sharing the same circuit with other high-power equipment (such as air conditioners and large instruments), which may cause voltage fluctuations or tripping. The ambient temperature for the operation of the equipment is recommended to be between 5°C and 30°C. Excessively high ambient temperatures will significantly increase the load on the compressor, leading to a decline in refrigeration efficiency and malfunctions. Please note that the equipment should not be installed in direct sunlight, near heat sources or in places with strong vibrations.   3. Ensuring the Validity and Repeatability of Tests The samples should be placed in the central position of the working chamber inside the box. There should be sufficient space between the samples and between the samples and the box wall (it is usually recommended to be more than 50mm) to ensure smooth air circulation inside the box and uniform and stable temperature. After conducting high-temperature and high-humidity tests (such as in a constant temperature and humidity chamber), if low-temperature tests are required, dehumidification operations should be carried out to prevent excessive ice formation inside the chamber, which could affect the performance of the equipment. It is strictly prohibited to test flammable, explosive, highly corrosive and highly volatile substances, except for explosion-proof test chambers specially designed for this purpose. It is strictly prohibited to place dangerous goods such as alcohol and gasoline in ordinary high and low temperature chambers.   4. Safety Operation Specifications and Emergency Procedures Before operation, check whether the box door is well sealed and whether the door lock function is normal. Check if the box is clean and free of any foreign objects. Confirm whether the set temperature curve (program) is correct. During the test period, it is necessary to regularly check whether the operation status of the equipment is normal and whether there are any abnormal noises or alarms. Sample handling and placement norms: Wear high and low temperature gloves properly. After opening the door, slightly turn your body to the side to avoid the heat wave hitting your face. Quickly and carefully remove the sample and place it in a safe area. Emergency response: Be familiar with the location of the emergency stop button of the equipment or how to quickly cut off the main power supply in an emergency. Carbon dioxide fire extinguishers (suitable for electrical fires) should be provided nearby instead of water or foam fire extinguishers.

  hot Tags : Constant Temperature and Humidity Test Chamber High and Low Temperature Test Chamber Temperature Cycling Box Test Chamber Test Environment Precision Oven Safety Precautions for Test Chambers

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• Lab Three-Combination Test Chamber Low Pressure Test Guide

  Sep 13, 2025

  The core system of the three-combination test chamber mainly consists of a pressure-bearing test chamber, a vacuum system, a special temperature and humidity control system, and a high-precision collaborative controller. Essentially, it is a complex set of equipment that highly integrates a temperature/humidity environment chamber, a vibration table, and a vacuum system (highly simulated). The process of conducting low-pressure tests is a precise collaborative control process. Taking the low-temperature - low-pressure test as an example, its test process is as follows:   1. Preparation stage: Firmly install the sample on the vibrating table surface inside the box (if vibration is not required, install it on the sample rack), close and lock the box door to ensure that the high-strength sealing strip is effective. Set the complete test program on the control interface, including:Pressure curve, temperature curve, humidity curve and vibration curve. 2. Vacuuming and cooling: The control system starts the vacuum pump set, and the vacuum valve opens to begin extracting the air inside the box. Meanwhile, the refrigeration system started to work, sending cold air into the box, and the temperature began to drop. The control system will dynamically coordinate the pumping speed of the vacuum pump and the power of the refrigeration system. Because when the air becomes thinner, the efficiency of heat conduction is greatly reduced, and the difficulty of cooling will increase. The system may not fully cool down until the air pressure drops to a certain level. 3. Low-pressure/low-temperature maintenance stage: Once both the pressure and temperature reach the set values, the system enters the maintenance state. As there is extremely tiny leakage in any box, the pressure sensor will monitor the air pressure in real time. When the air pressure exceeds the set value, the vacuum pump will automatically start to pump a little, maintaining the pressure within a very precise range. 4. Humidification is the most complex step. If it is necessary to simulate high humidity in a high-altitude and low-pressure environment, the control system will activate the external steam generator, and then slowly "inject" the generated steam into the low-pressure box through a special pressurization and metering valve, and the humidity sensor will provide feedback control. 5. After the test period ends, the system enters the recovery stage. The controller slowly opens the pressure relief valve or air injection valve to allow dry filtered air to slowly enter the box, enabling the air pressure to steadily return to normal pressure. When both the air pressure and temperature stabilize at room temperature and normal pressure, the controller will send a signal to indicate the end of the test. The operator can then open the box door and take out the sample for subsequent performance testing and evaluation.   The low-pressure test of the three-combination test chamber is a highly complex process, which relies on the precise coordination of its pressure-resistant chamber, powerful vacuum system and temperature and humidity control system specially designed for low-pressure environments. It can truly simulate the harsh tests that products simultaneously endure in high-altitude, high-altitude and other environments, including severe cold, low oxygen (low air pressure), and humidity. It is an indispensable key testing device in fields such as aerospace, military industry, and automotive electronics.

  hot Tags : High and Low Temperature Test Chamber Three-combination Test Chamber Large-scale Test Equipment Environmental Reliability Test System Vibration - Temperature and Humidity Comprehensive Test Chamber THV Series Three-Combination Test Chamber

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• Corrosive Effect of Salt Spray Testing Machine

  Sep 12, 2025

  The salt spray testing machine is a widely used corrosion testing device. Its core function is to evaluate the corrosion resistance of materials by simulating and accelerating the corrosion process. Firstly, the sprayed sodium chloride (NaCl) solution forms a thin, conductive salt film on the surface of the sample. This liquid film, as an electrolyte, provides the necessary environment for electrochemical corrosion. The region with higher surface activity of the metal serves as the anode, where metal atoms lose electrons and undergo oxidation reactions, transforming into metal ions that dissolve into the electrolyte. The area with lower surface activity of the metal serves as the cathode. A reduction reaction occurs in the presence of oxygen in a salt solution. Finally, the metal ions produced at the anode (such as Fe²⁺) combine with the hydroxide ions (OH⁻) generated at the cathode to form metal hydroxides, which are further oxidized into common rust. For example: Fe²⁺ + 2OH⁻ → Fe(OH)₂ 4Fe(OH)₂ + O₂ → 2Fe₂O₃·H₂O + 2H₂O(Red rust) Compared with the slow corrosion in nature, the salt spray test greatly accelerates the corrosion process in the following ways: 1. Constant high-concentration brine environment: Usually a 5% sodium chloride solution is used, with a concentration much higher than that of most natural environments (such as seawater), providing a large amount of corrosive chloride ions (Cl⁻). Chloride ions have strong penetrating power and can destroy the passivation film on the metal surface, allowing corrosion to continue. 2. Continuous spraying: The machine continuously atomizes salt water and sprays it into a sealed box, ensuring that all surfaces of the sample are evenly covered by the salt spray. This avoids the alternating dry and wet conditions in the natural environment and allows the corrosion reaction to proceed without interruption. 3. Heating: The temperature of the test chamber is usually kept constant at 35℃. The temperature rise accelerates the rates of all chemical reactions, including the electrochemical corrosion process, thereby significantly speeding up corrosion. 4. Oxygen supply: The surface area of the atomized droplets is extremely large, which can fully dissolve oxygen in the air. Continuous spraying ensures a steady supply of oxygen required for the cathodic corrosion reaction. Lab salt spray testing machine is suitable for neutral salt spray tests (NSS) and corrosion tests (AASS, CASS) of various communication electronic products, electronic appliances and hardware components. Complies with standards such as CNS, ASTM, JIS, and ISO. The salt spray test is conducted on the surfaces of various materials that have undergone anti-corrosion treatments such as coating, electroplating, anodizing, and anti-rust oil to assess the corrosion resistance of the products. It is worth noting that salt spray testing is a highly accelerated test, and its corrosion mechanism and morphology are not exactly the same as those in real outdoor environments (such as atmospheric exposure and seawater immersion). Products that pass this test do not necessarily achieve the same corrosion resistance period in all real environments. It is more suitable for relative rankings rather than absolute predictions.

  hot Tags : Salt Spray Corrosion Test Chamber Environmental Simulation Test Chamber Salt Spray Testing Machine CASS Test Chamber Corrosion Testing Equipment NSS Test Chamber

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• How does the Lab Ultraviolet Light Test Chamber Reproduce Sun Exposure and Rain?

  Sep 10, 2025

  Lab Companion UV weathering test chamber is a professional device used to simulate and evaluate the resistance performance of materials under ultraviolet radiation and corresponding climatic conditions for testing outdoor products. Its core function lies in simulating the impact of ultraviolet rays on materials in the natural environment through artificially controlled ultraviolet irradiation, temperature and humidity changes, thereby conducting comprehensive and systematic tests on the durability, color stability and physical properties of materials. In recent years, with the development of technology and the continuous improvement of requirements for material performance, the application of UV weathering test chambers has become increasingly widespread, covering multiple fields such as plastics, coatings, and textiles. The Q8 system independently developed by Lab can simulate the damage caused by sunlight and rain, and complies with multiple international certification standards. It can be programmed to conduct continuous ultraviolet light and rain weather resistance tests 24 hours a day and 7 days a week. It only takes a few days or weeks to reproduce the damage that occurs outdoors in months or even years, including various phenomena such as color change and powdering. Meanwhile, the Q8/UV2/UV3 are equipped with a standard ultraviolet light detection system, which precisely controls the light intensity. Four sets of UV intensity sensors automatically adjust the energy of the lamp tubes based on the aging state to make compensation, significantly reducing the experimental time and ensuring the reproducibility of the system. To more realistically simulate the effects of rainwater scouring and cooling, the ultraviolet test chamber is also equipped with a spray system. The Q8/UV3 model is equipped with 12 sets of water spray devices to simulate mechanical corrosion caused by rainwater erosion. When the sample is heated to a high temperature by an ultraviolet lamp, it is sprayed with cold water to generate intense thermal contraction stress, simulating a sudden downpour in summer. The scouring effect of water flow can simulate the erosion of coatings, paints and other surfaces by rainwater, washing away the aged and decomposed substances on the surface and exposing new material layers to continue aging. A typical test loop is: Under the set irradiance and high temperature, 4 hours of ultraviolet light is used to simulate daytime sun exposure. With the lights off and high humidity maintained, 4 hours of condensation at night is simulated. During this process, short sprays can be inserted regularly to simulate rainfall. By intensifying and cycling these key environmental factors, the ultraviolet light test chamber can reproduce within days or weeks the aging damage that materials would take months or even years outdoors, thus being used for product quality control and durability assessment. However, this test is an accelerated experiment, and its results are correlated with those of real outdoor exposure, rather than being completely equivalent. Different materials and testing standards will select different types of lamp tubes, irradiance, temperatures, and cycle periods to obtain the most relevant prediction results.

  hot Tags : Temperature and Humidity Test Chamber Environmental Simulation Test Chamber Ultraviolet Light Test Chamber Accelerated Aging Test Chamber Ultraviolet Light Simulation Test Environmental Testing Equipment

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