Temperature Testing Equipment

• 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.

  hot Tags : High Temperature Test Chamber Low Temperature Test Chamber Rapid Temperature Change Test Chamber Temperature Test Chamber Temperature Testing Equipment Small Industrial Test Chamber

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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.

  hot Tags : High Temperature Oven High Temperature Test Chamber Low Temperature Test Chamber Programmable Temperature Test Chamber Temperature Testing Equipment Precision Oven

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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.

  hot Tags : High and Low Temperature Test Chamber Thermal Shock Test Chamber Humidity Test Chamber Temperature Test Chamber Temperature Testing Equipment Precision Ove

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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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• Working Principle of Lab Companion Air-cooled Mechanical Compression Refrigeration

  Sep 06, 2025

  1.Compression The low-temperature and low-pressure gaseous refrigerant flows out of the evaporator and is sucked in by the compressor. The compressor does work on this part of the gas (consuming electrical energy) and compresses it violently. When the refrigerant turns into high-temperature and high-pressure superheated vapor, the temperature of the vapor is much higher than the ambient temperature, creating conditions for heat release to the outside. 2. Condensation The high-temperature and high-pressure refrigerant vapor enters the condenser (usually a finned tube heat exchanger composed of copper tubes and aluminum fins). The fan forces the ambient air to blow over the condenser fins. Subsequently, the refrigerant vapor releases heat to the flowing air in the condenser. Due to cooling, it gradually condenses from a gaseous state into a medium-temperature and high-pressure liquid. At this point, the heat is transferred from the refrigeration system to the outdoor environment. 3. Expansion The medium-temperature and high-pressure liquid refrigerant flows through a narrow channel through the throttling device, which serves to throttle and reduce pressure, similar to blocking the opening of a water pipe with a finger. When the pressure of the refrigerant drops suddenly, the temperature also drops sharply, turning into a low-temperature and low-pressure gas-liquid two-phase mixture (mist). 4. Evaporation The low-temperature and low-pressure gas-liquid mixture enters the evaporator, and another fan circulates the air inside the box through the cold evaporator fins. The refrigerant liquid absorbs the heat of the air flowing through the fins in the evaporator, rapidly evaporates and vaporizes, and reverts to a low-temperature and low-pressure gas. Due to the absorption of heat, the temperature of the air flowing through the evaporator drops significantly, thereby achieving the cooling of the test chamber.   Subsequently, this low-temperature and low-pressure gas is drawn into the compressor again, initiating the next cycle. In this way, the cycle repeats itself without end. The refrigeration system continuously "moves" the heat inside the box to the outside and dissipates the heat into the atmosphere through the fan.

  hot Tags : High and Low Temperature Test Chamber High and Low Temperature Humidity Test Chamber Environmental Simulation Test Refrigeration Air Cooled Temperature Testing Equipment Refrigeration Compressor

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