Environmental Simulation Test Chamber

• 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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• 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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• How to Choose the Appropriate Cooling Method for Test Chambers？

  Sep 09, 2025

  Air cooling and water cooling are two mainstream heat dissipation methods in refrigeration equipment. The most fundamental difference between them lies in the different media they use to discharge the heat generated by the system into the external environment: air cooling relies on air, while water cooling relies on water. This core difference has given rise to numerous distinctions among them in terms of installation, usage, cost and applicable scenarios.   1. Air-cooled system The working principle of an air-cooling system is to force air flow through a fan, blowing it over its core heat dissipation component - the finned condenser, thereby carrying away the heat in the condenser and dissipating it into the surrounding air. Its installation is very simple and flexible. The equipment can operate simply by connecting to the power supply and does not require additional supporting facilities, thus having the lowest requirements for site renovation. This cooling performance is significantly affected by the ambient temperature. In hot summers or high-temperature environments with poor ventilation, due to the reduced temperature difference between the air and the condenser, the heat dissipation efficiency will drop markedly, resulting in a decline in the equipment's cooling capacity and an increase in operational energy consumption. Moreover, it will be accompanied by considerable fan noise during operation. Its initial investment is usually low, and daily maintenance is relatively simple. The main task is to regularly clean the dust on the condenser fins to ensure smooth ventilation. The main operating cost is electricity consumption. Air-cooled systems are highly suitable for small and medium-sized equipment, areas with abundant electricity but scarce water resources or inconvenient water access, laboratories with controllable environmental temperatures, as well as projects with limited budgets or those that prefer a simple and quick installation process.   2. Water-cooled system The working principle of a water-cooling system is to use circulating water flowing through a dedicated water-cooled condenser to absorb and carry away the heat of the system. The heated water flow is usually transported to the outdoor cooling tower for cooling and then recycled again. Its installation is complex and requires a complete set of external water systems, including cooling towers, water pumps, water pipe networks and water treatment devices. This not only fixes the installation location of the equipment, but also places high demands on site planning and infrastructure. The heat dissipation performance of the system is very stable and is basically not affected by changes in the external environmental temperature. Meanwhile, the operating noise near the equipment body is relatively low. Its initial investment is high. Besides electricity consumption, there are also other costs such as continuous water resource consumption during daily operation. The maintenance work is also more professional and complex, and it is necessary to prevent scale formation, corrosion and microbial growth. Water-cooled systems are mainly suitable for large, high-power industrial-grade equipment, workshops with high ambient temperatures or poor ventilation conditions, as well as situations where extremely high temperature stability and refrigeration efficiency are required.   Choosing between air cooling and water cooling is not about judging their absolute superiority or inferiority, but about finding the solution that best suits one's specific conditions. Decisions should be based on the following considerations: Firstly, large high-power equipment usually prefers water cooling to achieve stable performance. At the same time, the geographical climate of the laboratory (whether it is hot), water supply conditions, installation space and ventilation conditions need to be evaluated. Secondly, if a relatively low initial investment is valued, air cooling is a suitable choice. If the focus is on long-term operational energy efficiency and stability, and one does not mind the relatively high initial construction cost, then water cooling has more advantages. Finally, it is necessary to consider whether one has the professional ability to conduct regular maintenance on complex water systems.

  hot Tags : High and Low Temperature Test Chamber Temperature Test Chamber Test Chamber Air-cooled Heat Dissipation Test Chamber Water Cooling Heat Dissipation Refrigeration Equipment for Test Chamber Environmental Simulation Test Chamber

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