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Equipo de prueba de temperatura

Equipo de prueba de temperatura

  • Small Rapid Temperature Change (Wet Heat) Test Chamber
    Nov 01, 2025
    In response to the testing and R&D requirements of electronic components such as semiconductors and automotive electronics, Lab Companion has developed a smaller capacity small rapid temperature change (wet heat) test chamber. While maintaining the advantages of standard rapid temperature change test chambers, it can also meet the needs of customers who have requirements for space size, with a single-phase 220VAC voltage specification. It can also meet the equipment usage requirements of customers in civilian office areas such as research institutions and universities. Its main features are as follows: 1. It has powerful heating and cooling performance 2. Heating rate: 15℃/min; Cooling rate: 15℃/min 3. (Temperature range: -45℃ to +155℃) 4. Single-phase 220VAC, meeting the electricity demands of more customers 5. Single-phase 220VAC, suitable for industrial and civil power supply specifications, can meet the equipment power demands of customers in civil office areas such as research institutions and universities. 6. The body is small and exquisite, with a compact structure and easy to move 7. The miniaturized structure design of the test chamber can effectively save configuration space. 8. The inner tank volume is 100L, the width is 600mm, the depth is less than 1400mm, and the product volume is less than 1.1m ³. It is suitable for the vast majority of residential and commercial elevators in China (GB/T7025.1). 9. The standard universal wheels enable the product to move freely at the installation site. 10. Standard air-cooled specification is provided, facilitating the movement and installation of the product 11. At the same time, it saves customers the cost and space of configuring cooling towers. 12. A more ergonomic operation touch screen design 13. Through the multi-angle adjustment of the touch screen, it can meet the operation needs and provide the best field of vision for users of different heights, making it more convenient and comfortable. 14. Energy-saving cold output temperature and humidity control system, with dual PID and water vapor partial pressure control, features mature technology and extremely high precision. 15. Network control and data acquisition can be carried out through the interface (RS-485/GPIB/Web Lan/RS-232C). 16. It is standard-equipped with left and right cable holes (50mm), which facilitates the connection of power on the sample and the conduct of multiple measurements. 17. The controller adopts a color LCD touch screen, which is simple and convenient to operate 18. Through the controller, two control methods, fixed value and program, can be selected to adapt to different applications. 19. The program control can be set to 100 modes, with 99 steps for each mode. Repeat the loop up to 999 times. 20. Multiple languages can be easily switched (Simplified Chinese, English), and test data can be stored on a USB flash drive.
    LEER MÁS
  • 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.
    LEER MÁS
  • 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.
    LEER MÁS
  • El principio de equilibrio de la temperatura dentro de la cámara de prueba mediante la válvula de aire
    Sep 22, 2025
    Su principio fundamental es un sistema de retroalimentación negativa de circuito cerrado de "calentamiento, medición y control". En pocas palabras, consiste en controlar con precisión la potencia de los elementos calefactores dentro de la caja para contrarrestar la disipación de calor causada por el entorno externo, manteniendo así una temperatura de prueba constante superior a la temperatura ambiente. El proceso mediante el cual la válvula de aire estabiliza la temperatura es un circuito cerrado dinámico y de ajuste continuo: Primero, establezca una temperatura objetivo. El sensor de temperatura mide la temperatura real dentro de la caja en tiempo real y transmite la señal al controlador PID.Cuando el controlador PID calcula el valor de error, calcula la potencia de calentamiento que debe ajustarse en función de dicho valor mediante el algoritmo PID. El algoritmo considera tres factores.P (proporción): ¿Cuál es el error de corriente? Cuanto mayor sea el error, mayor será el rango de ajuste de la potencia de calentamiento.I (integral): Acumulación de errores durante un período determinado. Se utiliza para eliminar errores estáticos (por ejemplo, si siempre hay una ligera desviación, el término de integración aumentará gradualmente su potencia hasta eliminarla por completo).D (diferencial): La tasa de variación del error actual. Si la temperatura se acerca rápidamente al objetivo, se reducirá la potencia de calentamiento con antelación para evitar un sobreimpulso.3. El controlador PID envía la señal calculada al controlador de potencia del elemento calefactor (como un relé de estado sólido SSR), regulando con precisión el voltaje o la corriente aplicada al cable calefactor, controlando así su generación de calor.4. El ventilador de circulación funciona continuamente para garantizar que el calor generado por la calefacción se distribuya de forma rápida y uniforme. Al mismo tiempo, también informa rápidamente al controlador sobre los cambios de señal del sensor de temperatura, lo que aumenta la rapidez de respuesta del sistema. El compensador de válvula de aire mide el volumen de aire, mientras que la densidad del aire varía con la temperatura. Bajo el mismo valor de presión diferencial, el caudal másico o volumétrico correspondiente al aire de diferentes densidades es diferente. Por lo tanto, la temperatura debe estabilizarse en un valor fijo conocido para que el microprocesador del instrumento pueda calcular con precisión el valor del volumen de aire en condiciones estándar, basándose en el valor de presión diferencial medido, utilizando la fórmula preestablecida. Si la temperatura es inestable, los resultados de la medición no serán fiables.
    LEER MÁS
  • Principio de funcionamiento del sistema de refrigeración por compresión mecánica enfriado por aire Lab Companion Principio de funcionamiento del sistema de refrigeración por compresión mecánica enfriado por aire Lab Companion
    Sep 06, 2025
    1.CompresiónEl refrigerante gaseoso a baja temperatura y baja presión sale del evaporador y es aspirado por el compresor. El compresor trabaja sobre esta parte del gas (consumiendo energía eléctrica) y lo comprime bruscamente. Cuando el refrigerante se convierte en vapor sobrecalentado a alta temperatura y alta presión, su temperatura es mucho mayor que la temperatura ambiente, lo que propicia la liberación de calor al exterior.2. CondensaciónEl vapor refrigerante a alta temperatura y alta presión entra en el condensador (generalmente un intercambiador de calor de tubos aleteados compuesto por tubos de cobre y aletas de aluminio). El ventilador impulsa el aire ambiente sobre las aletas del condensador. Posteriormente, el vapor refrigerante libera calor al aire que fluye en el condensador. Debido al enfriamiento, se condensa gradualmente de estado gaseoso a líquido a temperatura media y alta presión. En este punto, el calor se transfiere del sistema de refrigeración al exterior.3. ExpansiónEl refrigerante líquido de temperatura media y alta presión fluye por un canal estrecho a través del dispositivo de estrangulación, que sirve para regular y reducir la presión, de forma similar a bloquear la abertura de una tubería de agua con un dedo. Cuando la presión del refrigerante cae repentinamente, la temperatura también desciende bruscamente, transformándose en una mezcla bifásica gas-líquido (niebla) a baja temperatura y baja presión.4. EvaporaciónLa mezcla de gas y líquido a baja temperatura y baja presión entra en el evaporador, y otro ventilador hace circular el aire dentro de la caja a través de las aletas frías del evaporador. El líquido refrigerante absorbe el calor del aire que fluye por las aletas del evaporador, se evapora y vaporiza rápidamente, convirtiéndose en un gas a baja temperatura y baja presión. Debido a la absorción de calor, la temperatura del aire que fluye por el evaporador disminuye significativamente, logrando así el enfriamiento de la cámara de prueba. Posteriormente, este gas a baja temperatura y baja presión se introduce de nuevo en el compresor, iniciando el siguiente ciclo. De esta manera, el ciclo se repite indefinidamente. El sistema de refrigeración desplaza continuamente el calor del interior de la caja hacia el exterior y lo disipa a la atmósfera mediante el ventilador.
    LEER MÁS

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