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• Flame-retardant PP Materials in Industry Working Principle

  Oct 27, 2025

  Polypropylene (PP) itself is a highly flammable hydrocarbon with a limiting oxygen index (LOI) of only 17.8%. It will continue to burn even after being removed from the fire source. The core principle of flame-retardant PP is to interrupt or delay its combustion cycle through physical and chemical means. Combustion requires the simultaneous existence of three elements: combustible material, heat and oxygen. The function of flame retardants is to destroy this "burning triangle".   In industry, flame retardancy is mainly achieved by adding flame retardants to PP. Different types of flame retardants function through the following mechanisms: 1. Gas-phase flame retardant mechanism This is one of the most common mechanisms, especially applicable to traditional halogen-based flame retardants. When flame retardants are heated and decomposed, they can capture the free radicals (such as H· and HO·) that maintain the combustion chain reaction in the combustion reaction zone (flame), causing their concentrations to drop sharply and thus interrupting the combustion. 2. Condensed phase flame retardant mechanism This is the most mainstream mechanism of halogen-free flame-retardant PP. Flame retardants promote the formation of a uniform and dense carbon layer on the surface of polymers. This layer of carbon has three major functions. The first step is to prevent external heat from entering the interior of the polymer. Secondly, it prevents the escape of flammable gases inside and the entry of external oxygen. Finally, it inhibits the further pyrolysis of the polymer and the generation of smoke. When a fire occurs, the acid source promotes the dehydration, cross-linking and carbonization of the carbon source. Meanwhile, the large amount of gas produced by the decomposition of the gas source causes the softened carbon layer to expand, eventually forming a porous, dense and strong foam carbon layer, which protects the underlying PP like "armor". 3. Cooling/heat absorption mechanism Flame retardants absorb a large amount of heat during the decomposition process, reducing the surface temperature of polymers and making it difficult for them to continuously pyrolyze and produce flammable gases. Typical representatives include aluminium hydroxide (ATH) and magnesium hydroxide (MH). When they decompose, they absorb a large amount of heat (endothermic reaction) and release water vapor. The water vapor can not only dilute flammable gases but also play a cooling role. 4. Dilution mechanism Flame retardants decompose to produce a large amount of non-flammable gases (such as water vapor and CO₂, etc.), which can dilute the concentration of flammable gases and oxygen near the polymer surface, making combustion unsustainable. Both the gas sources of metal hydroxides and intumescent flame retardants have this function.   In conclusion, the working principle of flame-retardant PP in industry is a complex process involving the synergy of multiple mechanisms. Modern flame-retardant PP technology is developing towards halogen-free, low smoke, low toxicity and high efficiency. Among them, the condensed phase flame-retardant mechanism represented by intumescent flame retardants (IFR) is the core of current research and application. By carefully designing flame-retardant formulas, the best balance can be achieved among flame-retardant efficiency, material mechanical properties, processing performance and cost.

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• Customized Solution for Double-Door Temperature Test Equipment

  Oct 25, 2025

  1.Core customization requirement analysis 1.1 The standard box size or load-bearing capacity (such as automotive parts, large unmanned aerial vehicles, and entire cabinet servers) cannot meet the requirements. Special sample racks, trays or suspension devices are required. The test samples need to be powered on and run inside the box, and connected to cables or pipes (such as battery pack charge and discharge tests, engine component tests). Oil stains, particulate matter or corrosive gases may be released during the sample testing process. 1.2 It needs to be connected with mechanical arms and AGV carts to achieve automatic loading and unloading. The heating and cooling rates required far exceed the standard specifications (such as >15°C/min). 1.3 The equipment needs to adapt to specific room sizes, door opening sizes or floor heights. There are special requirements for the power supply (if it cannot meet 380V) and the cooling water source (if a cooling tower cannot be provided).   2. Key customized technical specifications 2.1 Customized Dimensions The internal effective space is determined entirely based on the size and quantity of the customer's samples. The minimum distance between the sample and the box wall needs to be considered to ensure uniform airflow. It is necessary to clearly define the size of the door, the material of the sealing strip, the door lock mechanism (mechanical lock, pneumatic auxiliary lock), and the size and quantity of the observation window. The inner box is usually made of SUS304 stainless steel. The outer box body can be made of high-quality steel plate with plastic spraying or SUS304. For corrosive tests, more durable materials should be specified. Test holes are used for leads. The size, quantity and position of the hole diameters (such as left or right) need to be customized, and sealing plugs or flanges should be provided. 2.2 Confirm the test interval The technical index standards for temperature are usually from -70°C to +150°C. The standard heating and cooling rate is 1 to 3°C/min. Linear rapid temperature change: 5 to 10°C/min. Nonlinear rapid temperature change: Customizable to 15°C/min or even higher. This is directly related to the power configuration of the refrigeration and heating systems and is a key factor influencing the cost. Customize stricter control accuracy, such as uniformity ≤±1.0°C and fluctuation ≤±0.5°C. 2.3 Refrigeration System Air cooling: Suitable for sites where the ambient temperature is not high and the ventilation around the equipment is good. Water cooling: It is suitable for large cooling capacity, high heat generation samples, or situations with high ambient temperatures. It is more efficient but requires a cooling tower. Cascade refrigeration: It is used for low-temperature requirements below -40°C and usually adopts two-stage cascade. 2.4 Installation Method The refrigeration system of the integrated machine is located at the top or bottom of the box, with a compact structure and convenient installation. The split-type refrigeration unit is separated from the box body and is suitable for high-power equipment. It can discharge noise and heat to the outside, but the installation is complex. 2.5 Control System and Software The controller customizes the size and brand of the color touch screen, supports multi-segment programming, program group loops, step jumps, etc. Customized LAN interface for connecting to the upper computer (computer) for data monitoring and recording. Whether it is necessary to support remote network monitoring and operation, as well as customize record intervals and storage capacity. 2.6 Independent sample over-temperature protector. Compressor overheat, overcurrent and overpressure protection; Fan overcurrent protection Cooling water cut-off protection and automatic stop test function when the door is opened; Leakage or short-circuit protection; Sound and light alarm prompt.   Customizing double-door temperature test equipment is a systematic project. The key to success lies in the clarification and refinement of the initial requirements. A detailed and unambiguous "Technical Requirements Document" serves as the cornerstone for communication between equipment suppliers and customers. It ensures that the final delivered equipment fully complies with testing, process, and site requirements, avoiding subsequent disputes and cost overruns.

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• How is over-temperature protection carried out in a temperature test chamber?

  Oct 23, 2025

  The over-temperature protection of the temperature test chamber is a multi-level and multi-redundant safety system. Its core purpose is to prevent the temperature inside the chamber from rising out of control due to equipment failure, thereby protecting the safety of the test samples, the test chamber itself and the laboratory environment.   The protection system usually consists of the following key parts working together: 1. Sensor: The main sensor is used for the normal temperature control of the test chamber and provides feedback signals to the main controller. An independent over-temperature protection sensor is the key to a safety system. It is a temperature-sensing element independent of the main control temperature system (usually a platinum resistance or thermocouple), which is placed by strategically at the position within the box that best represents the risk of overheating (such as near the heater outlet or on the top of the working chamber). Its sole task is to monitor over-temperature. 2. Processing unit: The main controller receives signals from the main sensor and executes the set temperature program. The independent over-temperature protector, as an independent hardware device, is specifically designed to receive and process the signals from the over-temperature protection sensor. It does not rely on the main controller. Even if the main controller crashes or experiences a serious malfunction, it can still operate normally. 3. Actuator: The main controller controls the on and off of the heater and the cooler. The safety relay/solid-state relay receives the signal sent by the over-temperature protector and directly cuts off the power supply circuit of the heater. This is the final execution action.   The over-temperature protection of the temperature test chamber is a multi-level, hard-wire connected safety system designed based on the concepts of "redundancy" and "independence". It does not rely on the main control system. Through independent sensors and controllers, when a dangerous temperature is detected, it directly and forcibly cuts off the heating energy and notifies the user through sound and light alarms, thus forming a complete and reliable safety closed loop.

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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.

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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.

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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.

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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.

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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.

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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.

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• Persyaratan Pengemasan dan Transportasi Ruang Uji Suhu Walk-in

  Oct 08, 2025

  Sebelum merancang rencana pengemasan dan pengangkutan, perlu dipahami terlebih dahulu karakteristik peralatan dan potensi risiko yang dihadapinya: Pertama, peralatan tersebut biasanya berukuran besar (puluhan meter kubik) dan beratnya dapat mencapai beberapa ton. Hal ini menjadikan pengangkutannya termasuk dalam kategori logistik barang besar. Sementara itu, lapisan insulasi busa pada badan kotak rentan terhadap benturan dan goresan, dan permukaan penyemprotan rentan terhadap goresan dan lekukan. Unit pendingin seperti kompresor, evaporator, dan kondensor rentan terhadap getaran dan kemiringan yang parah. Sistem kontrol dan sensor kelistrikan rentan terhadap guncangan, dll. Untuk mengatasi tantangan di atas, blok busa, kapas mutiara, dan pengisi lainnya harus digunakan di dalam peralatan untuk mengamankan rak sampel, saluran udara, dan komponen bergerak lainnya agar tidak goyang dan bertabrakan di dalam kotak. Pintu harus dikunci dari dalam dengan kunci atau tali khusus agar tidak terbuka dan tertutup selama pengangkutan. Biasanya, bahan bantalan ditempatkan di celah pintu agar pintu tidak langsung membentur kusen pintu. Kemasan utama merupakan bagian terpenting. Disarankan untuk menggunakan struktur pelindung berlapis, seperti pelindung anti-lembap dan debu, pelindung bantalan, serta rangka kotak kayu dan pelindung eksternal. Rencana transportasi terutama mencakupPilihan pertama untuk transportasi darat domestik adalah truk bak datar. Truk ini praktis untuk pengangkatan atas dan bongkar muat samping, serta cocok untuk barang ekstra lebar dan ekstra tinggi. Pilihan kedua adalah truk boks, yang dapat memberikan perlindungan lebih baik terhadap hujan dan debu, tetapi perlu memastikan dimensi internal dan daya dukungnya memadai. Namun, kuncinya terletak pada penggunaan kendaraan berkantong udara atau kendaraan suspensi udara untuk memaksimalkan penyerapan guncangan.2. Transportasi laut adalah yang paling umum digunakan dalam transportasi internasional. Kemasan peralatan harus mampu menahan guncangan, kelembapan, dan semprotan garam di dalam kontainer. Disarankan untuk menggunakan lemari super tinggi setinggi 40 kaki. Jika perlu, tambahkan pengering di dalam kontainer. Angkutan udara sangat mahal dan hanya cocok untuk proyek yang mendesak atau dengan waktu tunggu yang sangat singkat. Terdapat batasan ketat terkait berat dan ukuran kemasan.3. Bongkar muat harus dilakukan menggunakan derek atau forklift. Dilarang keras menancapkan garpu langsung ke badan peralatan. Spesifikasi teknis peralatan biasanya dengan jelas mencantumkan sudut kemiringan maksimum (misalnya 15° atau 30°). Kepatuhan yang ketat harus dijaga selama pengangkutan dan penanganan; jika tidak, dapat menyebabkan kerusakan kompresor atau kebocoran refrigeran. Terakhir, perlu untuk mengonfirmasi dimensi lintasan di lokasi, daya dukung tanah, dan kapasitas lift dengan pelanggan terlebih dahulu, serta merumuskan rencana penempatan yang terperinci. Pengemasan dan pengangkutan ruang uji suhu walk-in Pada dasarnya, ini adalah tugas profesional yang memperlakukan peralatan industri sebagai "barang presisi". Kelalaian apa pun dalam proses ini dapat mengakibatkan kerugian ekonomi yang besar dan penundaan proyek. Oleh karena itu, menginvestasikan sumber daya dan upaya yang memadai dalam rencana pengemasan dan transportasi merupakan prasyarat utama untuk memastikan kedatangan yang aman dan kelancaran pengoperasian peralatan.

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• Prinsip Penyeimbangan Suhu di Dalam Ruang Uji dengan Katup Udara

  Sep 22, 2025

  Prinsip intinya adalah sistem umpan balik negatif loop tertutup "pemanasan - pengukuran - kontrol". Sederhananya, sistem ini mengontrol daya elemen pemanas di dalam kotak secara presisi untuk menangkal pembuangan panas yang disebabkan oleh lingkungan eksternal, sehingga mempertahankan suhu uji konstan yang lebih tinggi daripada suhu sekitar. Proses stabilisasi suhu oleh katup udara merupakan loop tertutup yang dinamis dan terus-menerus menyesuaikan: Pertama, tetapkan suhu target. Sensor suhu akan mengukur suhu aktual di dalam kotak secara real-time dan mengirimkan sinyal ke pengontrol PID.Ketika pengontrol PID menghitung nilai kesalahan, ia menghitung daya pemanas yang perlu disesuaikan berdasarkan nilai kesalahan tersebut melalui algoritma PID. Algoritma ini akan mempertimbangkan tiga faktor:P (proporsi): Seberapa besar kesalahan arus? Semakin besar kesalahannya, semakin besar pula rentang penyesuaian daya pemanas.I (integral): Akumulasi kesalahan selama periode waktu tertentu. Ini digunakan untuk menghilangkan kesalahan statis (misalnya, jika selalu terdapat sedikit deviasi, suku integrasi akan secara bertahap meningkatkan daya untuk menghilangkannya sepenuhnya).D (diferensial): Laju perubahan kesalahan arus. Jika suhu mendekati target dengan cepat, daya pemanas akan dikurangi terlebih dahulu untuk mencegah "overshoot".3. Pengontrol PID mengirimkan sinyal terhitung ke pengontrol daya elemen pemanas (seperti relai solid-state SSR), yang secara tepat mengatur tegangan atau arus yang diterapkan ke kawat pemanas, sehingga mengendalikan pembangkitan panasnya.4. Kipas sirkulasi bekerja terus menerus untuk memastikan panas yang dihasilkan oleh pemanasan terdistribusi dengan cepat dan merata. Pada saat yang sama, kipas ini juga dengan cepat mengirimkan kembali perubahan sinyal dari sensor suhu ke pengontrol, sehingga respons sistem lebih cepat. Penyeimbang katup udara mengukur volume udara, sementara densitas udara bervariasi seiring suhu. Pada nilai tekanan diferensial yang sama, laju aliran massa atau laju aliran volume udara dengan densitas berbeda akan berbeda pula. Oleh karena itu, suhu harus distabilkan pada nilai tetap yang telah diketahui agar mikroprosesor di dalam instrumen dapat menghitung nilai volume udara secara akurat dalam kondisi standar berdasarkan nilai tekanan diferensial yang terukur menggunakan rumus yang telah ditentukan sebelumnya. Jika suhu tidak stabil, hasil pengukuran tidak akan dapat diandalkan.

  TAG PANAS : Ruang Uji Suhu Tinggi dan Rendah Kamar Suhu dan Kelembaban Konstan Peralatan Uji Suhu Ruang Uji Simulasi Lingkungan Komponen Inti Ruang Uji Keseimbangan Suhu Tinggi dan Rendah

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• Membangun Lingkungan Uji Ruang Uji yang Aman

  Sep 16, 2025

  Kunci untuk menciptakan lingkungan pengujian yang aman untuk Lab ruang uji suhu tinggi dan rendah terletak pada upaya memastikan keselamatan pribadi, keselamatan peralatan, keselamatan benda uji, dan keakuratan data.1. Pertimbangan Keselamatan PribadiSebelum membuka pintu ruang suhu tinggi untuk mengambil sampel, wajib mengenakan alat pelindung diri (APD) tahan suhu tinggi dan rendah dengan benar. Saat melakukan operasi yang dapat menyebabkan percikan atau kebocoran gas yang sangat panas/dingin, disarankan untuk mengenakan masker atau kacamata pelindung.Ruang uji harus dipasang di laboratorium berventilasi baik dan hindari pengoperasian di ruang sempit yang terbatas. Pengujian suhu tinggi dapat melepaskan zat volatil dari benda uji. Ventilasi yang baik dapat mencegah akumulasi gas berbahaya.Pastikan spesifikasi kabel daya memenuhi persyaratan peralatan dan kabel arde harus terhubung dengan aman. Yang terpenting, dilarang keras menyentuh steker, sakelar, dan sampel listrik dengan tangan basah untuk mencegah sengatan listrik. 2. Pasang peralatan dengan benarJarak aman minimum yang ditentukan oleh produsen (biasanya minimal 50-100 sentimeter) harus dijaga di bagian belakang, atas, dan kedua sisi peralatan untuk memastikan pengoperasian normal kondensor, kompresor, dan sistem pembuangan panas lainnya. Ventilasi yang buruk dapat menyebabkan peralatan menjadi terlalu panas, penurunan kinerja, dan bahkan kebakaran.Disarankan untuk menyediakan saluran listrik khusus untuk ruang uji guna menghindari berbagi sirkuit yang sama dengan peralatan berdaya tinggi lainnya (seperti AC dan instrumen besar), yang dapat menyebabkan fluktuasi tegangan atau tersandung.Suhu sekitar untuk pengoperasian peralatan ini disarankan antara 5°C dan 30°C. Suhu sekitar yang terlalu tinggi akan meningkatkan beban kompresor secara signifikan, yang mengakibatkan penurunan efisiensi pendinginan dan malfungsi. Harap diperhatikan bahwa peralatan ini tidak boleh dipasang di bawah sinar matahari langsung, di dekat sumber panas, atau di tempat dengan getaran kuat. 3. Memastikan Validitas dan Pengulangan TesSampel harus ditempatkan di posisi tengah ruang kerja di dalam kotak. Harus ada ruang yang cukup antara sampel dan antara sampel dengan dinding kotak (biasanya disarankan lebih dari 50 mm) untuk memastikan sirkulasi udara yang lancar di dalam kotak dan suhu yang seragam dan stabil.Setelah melakukan pengujian suhu tinggi dan kelembapan tinggi (seperti dalam ruang suhu dan kelembapan konstan), jika pengujian suhu rendah diperlukan, operasi dehumidifikasi harus dilakukan untuk mencegah pembentukan es berlebihan di dalam ruang, yang dapat memengaruhi kinerja peralatan.Dilarang keras menguji zat yang mudah terbakar, meledak, sangat korosif, dan sangat mudah menguap, kecuali untuk ruang uji tahan ledakan yang dirancang khusus untuk tujuan ini. Dilarang keras menempatkan barang berbahaya seperti alkohol dan bensin di dalam ruang bersuhu tinggi dan rendah biasa. 4. Spesifikasi Operasi Keselamatan dan Prosedur DaruratSebelum pengoperasian, periksa apakah pintu kotak tertutup rapat dan apakah fungsi kunci pintu berfungsi normal. Periksa apakah kotak bersih dan bebas dari benda asing. Pastikan kurva suhu yang disetel (program) sudah benar.Selama periode pengujian, perlu untuk memeriksa secara teratur apakah status pengoperasian peralatan normal dan apakah ada suara atau alarm yang tidak normal.Norma penanganan dan penempatan sampel: Kenakan sarung tangan suhu tinggi dan rendah dengan benar. Setelah membuka pintu, miringkan tubuh Anda sedikit ke samping untuk menghindari gelombang panas mengenai wajah. Keluarkan sampel dengan cepat dan hati-hati, lalu letakkan di tempat yang aman.Tanggap darurat: Pahami lokasi tombol berhenti darurat pada peralatan atau cara cepat memutus aliran listrik utama dalam keadaan darurat. Alat pemadam api karbon dioksida (cocok untuk kebakaran listrik) harus disediakan di dekat Anda, alih-alih alat pemadam api air atau busa.

  TAG PANAS : Ruang Uji Suhu dan Kelembaban Konstan Ruang Uji Suhu Tinggi dan Rendah Kotak Siklus Suhu Lingkungan Uji Ruang Uji Oven Presisi Tindakan Pencegahan Keamanan untuk Ruang Uji

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