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.
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.
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.
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