In many outdoor environments, materials can be exposed to humidity for up to 12 hours a day. Research shows that the main factor causing this outdoor humidity is dew, rather than rainwater. The Accelerated Aging Test chamber simulates the outdoor humid erosion through its unique condensation function. During the condensation cycle of the test, the water in the reservoir at the bottom   of the test chamber is heated to generate hot steam, which fills the entire test chamber. The hot steam maintains the relative humidity in the test chamber at 100% and keeps a relatively high temperature. The sample is fixed on the side wall of the test chamber, so that the test surface of the sample is exposed to the ambient air inside the test chamber. The outer side of the sample is exposed to the natural environment, which has a cooling effect, resulting in a temperature difference between the inner and outer surfaces of the sample. This temperature difference leads to the continuous generation of condensed liquid water on the test surface of the sample throughout the condensation cycle.

Since the exposure time to humidity during outdoor exposure can be as long as more than ten hours a day, a typical condensation cycle generally lasts for several hours. The Accelerated Aging Tester provides two methods for simulating humidity. The most widely used method is the condensation method, which is the best way to simulate outdoor humid erosion. All Accelerated Aging Tester models can run the condensation cycle. Because some application conditions also require the use of water spray to achieve the actual effect, some models can run both the condensation cycle and the water spray cycle.

For certain applications, water spray can better simulate the final usage environmental conditions. Water spray is very effective in simulating the thermal shock or mechanical erosion caused by sudden temperature changes and the scouring of rainwater. Under certain actual application conditions, for example, in the sunlight, when the accumulated heat dissipates rapidly due to a sudden shower, the temperature of the material will change sharply, resulting in thermal shock, which is a test for many materials. The water spray of the chamber can simulate thermal shock and/or stress corrosion. The spray system has 12 nozzles, with 6 nozzles on each side of the test chamber. The spray system can run for a few minutes and then be turned off. This short period of water spraying can quickly cool the sample, creating the conditions for thermal shock. 

The High and Low Temperature Humid Test Chambers is the main equipment in temperature and humidity environment testing, mainly used for evaluating the temperature and humidity tolerance of products, so as to ensure that our products can work and operate normally under any environmental conditions. However, if the temperature uniformity exceeds the allowable deviation range during environmental testing in the Chambers, the data obtained from the test is unreliable and cannot be used as the ultimate tolerance for high and low temperature testing of materials. So what are the reasons that can cause temperature uniformity to exceed the allowable deviation range?  

1. The differences test objects in the High and Low Temperature Humid Test Chamber: If test samples that to a great extent affect the overall camber’s internal heat convection, it will inevitably affect the uniformity of internal sample’s temperature. For example, if LED lighting products are test, the products themselves emit light and heat, becoming a thermal load, which will has a significant impact on temperature uniformity.

2.  The volume of the tested object: If the volume of the test object is too large, or the placing position in the chamber is inappropriate, it will obstruct the air convection inside and also cause significant temperature uniformity deviation. For Placing the test product next to the air duct seriously affects the circulation of air, and of course, the uniformity of temperature will be greatly affected.  

3. The internal structure design of the chamber: This aspect is mainly reflected in sheet metal design and processing, such as the design of air ducts, the placement of heating pipes, and the size of fan power. All of these will affect the temperature uniformity inside the camber.

4. Design of the camber’s inner wall: Due to the different structures about the inner wall of the test chamber, the temperature of the inner wall will also be uneven, which will affect the heat convection inside the working chamber and cause deviation in the internal temperature uniformity.  

5. The six sides of the camber have uneven heat dissipation: Due to the different heat transfer coefficients on the front, back, left, right, top, and bottom surfaces of the camber’s wall, some sides have threading holes, others have testing holes, etc., which will cause local heat dissipation and transfer, resulting in uneven temperature distribution of the camber and uneven radiative convective heat transfer on the wall, final affecting temperature uniformity.  

6. The leakproofness of camber’s door: The sealing of the camber and door is not strict, for example, the sealing strip is not customized and has seams between door and wall, the door will leaks the air, which is going to affects the temperature uniformity of the hole camber.  

In summary, those may the culprit affected the temperature uniformity inside the test chamber, we suggest that you can investigate from these aspects one by one, which will surely solve your confusion and difficulties.

Condition one: environmental condition　　

1. Temperature: 15 ℃~35 ℃;　　

2. Relative humidity: not exceeding 85%;　　

3. Atmospheric pressure: 80kPa~106kPa

4. There is no strong vibration or corrosive gas around;

5. No direct sunlight exposure or direct radiation from other cold or heat sources;

6. There is no strong airflow around, and when the surrounding air needs to be forced to flow, the airflow should not be directly blown onto the equipment.

7.No magnetic field surrounding of the test chamber that may interference control circuit.

8.There is no high concentration of dust and corrosive substances around.

Condition two: Power supply condition

1. AC Voltage: 220V ± 22V or 380V ± 38V;

2. Frequency: 50Hz ± 0.5Hz.

Usage Conditions three: Water Supply Conditions

It is recommended to use tap water or circulating water that meets the following conditions:  

1.Water Temperature: Not exceeding 30℃;  

2.Water Pressure: 0.1MPa to 0.3MPa; 

3.Water Quality: Complies with industrial water standards.  

Usage Conditions four: load for test chamber 

The test chamber load must simultaneously meet the following conditions:  

1. Total Mass of Load: The mass of the load per cubic meter of workspace volume should not exceed 80 kg;  

2. Total Volume of Load: The total volume of the load should not exceed 1/5 of the workspace volume;  

3. Load Placement: On any cross-section perpendicular to the main airflow direction, the total area of the load should not exceed 1/3 of the workspace cross-sectional area. The load must not obstruct airflow. 

Why Should You Evacuate Before Heating in a Vacuum Drying Oven？

1) Protect the Vacuum Pump：

If you heat the oven before evacuating, the heated air will be drawn out by the vacuum pump. This process transfers heat to the pump, potentially causing it to overheat. Overheating can reduce the efficiency of the vacuum pump and may even damage it.

2) Preventing Damage to the Vacuum Gauge:

If heating the oven first, heated air would directed toward the Vacuum Gauge and cause this instrument to overheat. If the temperature exceeds the gauge's operational limits, it may lead to inaccurate readings or permanent damage.

3)Avoiding Safety Hazards:

The tested material is placed in the vacuum chamber that can remove extracted gases from the material. If the tested material is heated first, the gas will expand when it encounters heat. Due to the excellent sealing of the vacuum chamber, the immense pressure generated by the expanding gas could cause the tempered glass of the observation window to shatter.

The correct procedure is to evacuate air first and then heat. If the vacuum level drops after reaching the desired temperature, you can briefly re-evacuate. This method helps extend the lifespan of the equipment.

Conclusion:

To ensure safety, maintain equipment efficiency, and prolong the lifespan of vacuum drying oven, always follow the correct procedure: evacuate air first, then heat. This simple step can prevent potential hazards and costly damages.

We have cooperated with the German company - Froilabo and brought in the dragon because it can control the temperature like the dragon in the fantasy story. Dragon, A high-precision temperature forcing system that can rapidly heat and cool samples to determine their durability and resistance against precise thermal environments.

In this blog discover what a temperature forcing system is, and how our Dragon can help you by providing precise thermal testing for a wide variety of applications.

Key points:

• A temperature forcing system is used to test a samples resilience and durability under different temperature conditions.
• Thermal testing is crucial to ensure products are safe to use and meet required safety standards and regulations.
• A temperature forcing system is suitable for a wide variety of applications, which includes heating electronic components, electronic characterization, and performing climatic simulations.
• Dragon is the perfect solution for all your thermal testing needs, and features high performance and accuracy at all steps of analysis.

What is a temperature forcing system?

A temperature forcing system is used to evaluate a samples performance under different temperature conditions. By subjecting samples to rapid temperature changes, you can test them for their resilience and durability.

These systems are crucial for several reasons:

• Improve safety: By subjecting devices to rapid temperature changes, you can ensure they meet your required safety standards and regulations.
• Efficient product development: By testing different components early in the design and development phase, you can identify any potential issues early and rectify it quickly.
• Assess reliability and performance: By testing your samples performance you can ensure your devices can withstand extreme temperatures.

How does a temperature forcing system work?

A temperature forcing system works by using a direct temperature-controlled stream of hot or cold air to provide a precise thermal environment for your samples. The Dragon provides a temperature range from -70oC to +250oC, to ensure sample function and viability at a wide range of temperatures.

Do I need a temperature forcing system?

Anyone who requires precise thermal testing would benefit from a temperature forcing system, and with Dragon it couldn’t be easier. All you have to do is create a method and Dragon does the rest.

In many industries, it’s essential to characterize and verify product performance when subjected to temperature variations. Dragon provides the perfect solution – our versatile and stable thermal unit is perfect for a wide range of applications.

Applications of the Dragon include:

• Heating electronic components
• Heating printed circuit boards
• Performing climatic simulations
• Electronic characterization
• Temperature cycling and targeted freezing applications

Discover the Dragon, the one stop solution for all your thermal testing needs:

• Excellent temperature stability: Delivering precision at every step of your testing, with a temperature range from -70oC to +250o
• Rapid temperature changes: Our Dragon effortlessly shifts from -55oC to +125oC in a matter of seconds (something even the mystical dragon can’t yet achieve)
• Digital connections: Connect your computer to your Dragon for simple method creation and run monitoring.
• Easy manoeuvring: It can still move with ease using the guide handle and 4 wheels to easily transport to your desired location.
• Adaptable to your needs: Our versatile product contains an adjustable airflow between 2.2 l/sec and 8.4 l/sec and three different working methods – manual, automatic and programmable.
• Compliance at every step: Dragon has been tested in accordance to and complies with the European norm in force: EN60068-3-11.

Learn more about the dragon by visiting our dedicated Dragon product page.

The Thermal Shock Test Chamber is a specialized experimental equipment used to test the performance of materials, electronic components, devices, and other products in extreme temperature conditions. It can simulate environmental changes from extreme cold to extreme heat, through rapid temperature transitions, observing and evaluating the stability and reliability of samples under such harsh conditions. This type of experiment is particularly in manufacturing industrial, electronic devices, and scientific research fields, as many products will facing drastic temperature changes in daily use.

It is extremely important to ensure the normal operation of electronic products in different environments during the designing and manufacturing, especially in the fields of aerospace, automotive electronics, communication equipment, etc. Products must be able to withstand various harsh weather and temperature changes. Through high and low temperature cyclic tests, engineers can reveal potential defects when using, also providing important references for subsequent product improvement and innovation.

        The Thermal Shock Test Chamber consists of two main parts: the environmental control system of  high and low temperatures. The temperature variation can generally be between -70 ℃ and 150 ℃ in the chamber, and the specific temperature range can be adjusted according to different needs. The experimental process will with multiple cycles, and each cycles contain rapid temperature changes that the sample to intense impacts between high and low temperatures. This type of testing can detect the physical properties of samples, including their tensile strength, elasticity, hardness, and even detect potential issues in thermal fatigue and material aging.

In addition, the design of this testing equipment is also very sophisticated, often equipped with advanced monitoring systems that can record temperature changes and sample reactions in  testing process, making the evaluation work more accurate and efficient. With the development of technology, the technology of Thermal Shock Test Chamber is also constantly updated, which not only improves the accuracy and speed of testing, but also enhances the safety and reliability of use.

In summary, Thermal Shock Test Chamber is an indispensable tool in modern material and product research. It provides us with an effective means to ensure that products can always maintain superior performance and stable quality in changing environments. It is an important link in promoting technological progress and industrial development. Through such experiments process, we can gain a deeper understanding of the characteristics and behavior of materials, thereby promoting the birth of safer and more reliable products.

Refrigeration System

The refrigeration system is one of the critical components of a comprehensive test chamber. Generally, refrigeration methods include mechanical refrigeration and auxiliary liquid nitrogen refrigeration. Mechanical refrigeration employs a vapor compression cycle, primarily consisting of a compressor, condenser, throttle mechanism, and evaporator. If the required low temperature reaches -55°C, single-stage refrigeration is insufficient. Therefore, Labcompanion's constant temperature and humidity chambers typically use a cascade refrigeration system. The refrigeration system is divided into two parts: the high-temperature section and the low-temperature section, each of which is a relatively independent refrigeration system. In the high-temperature section, the refrigerant evaporates and absorbs heat from the low-temperature section's refrigerant, causing it to vaporize. In the low-temperature section, the refrigerant evaporates and absorbs heat from the air inside the chamber to achieve cooling. The high-temperature and low-temperature sections are connected by an evaporative condenser, which serves as the condenser for the high-temperature section and the evaporator for the low-temperature section.

Heating System

The heating system of the test chamber is relatively simple compared to the refrigeration system. It mainly consists of high-power resistance wires. Due to the high heating rate required by the test chamber, the heating system is designed with significant power, and heaters are also installed on the chamber's base plate.

Control System

The control system is the core of the comprehensive test chamber, determining critical indicators such as heating rate and precision. Most modern test chambers use PID controllers, while a few employ a combination of PID and fuzzy control. Since the control system is primarily based on software, it generally operates without issues during use.

Humidity System

The humidity system is divided into two subsystems: humidification and dehumidification. Humidification is typically achieved through steam injection, where low-pressure steam is directly introduced into the test space. This method offers strong humidification capacity, rapid response, and precise control, especially during cooling processes where forced humidification is necessary.

Dehumidification can be achieved through two methods: mechanical refrigeration and desiccant dehumidification. Mechanical refrigeration dehumidification works by cooling the air below its dew point, causing excess moisture to condense and thus reducing humidity. Desiccant dehumidification involves pumping air out of the chamber, injecting dry air, and recycling the moist air through a desiccant for drying before reintroducing it into the chamber. Most comprehensive test chambers use the former method, while the latter is reserved for specialized applications requiring dew points below 0°C, albeit at a higher cost.

Sensors

Sensors primarily include temperature and humidity sensors. Platinum resistance thermometers and thermocouples are commonly used for temperature measurement. Humidity measurement methods include the dry-wet bulb thermometer and solid-state electronic sensors. Due to the lower accuracy of the dry-wet bulb method, solid-state sensors are increasingly replacing it in modern constant temperature and humidity chambers.

Air Circulation System

The air circulation system typically consists of a centrifugal fan and a motor that drives it. This system ensures the continuous circulation of air within the test chamber, maintaining uniform temperature and humidity distribution.

In modern agricultural production, harvesting and processing of grains are important links. In order to improve efficiency and quality, grain color sorter has become one of the indispensable equipment. As a well-known agricultural industrial machinery manufacturer, Mihoshi brand provides a series of efficient and intelligent grain color sorting machines for production and processing companies with its advanced technology and excellent quality. This article will introduce the characteristics and advantages of Mihoshi Valley's selection machine, helping readers choose the equipment that suits their needs.

Characteristics of Mihoshi Valley's Machine Selection

The Mihoshi grain sorting machine adopts advanced optical sensing technology and image processing algorithms, which can comprehensively and accurately sort grains. Its main features include:

Efficient and energy-saving: The Mihoshi Valley selection machine adopts an optimized operating system and an efficient exhaust system to reduce energy consumption and improve work efficiency.

Accurate sorting: The grain color sorter can accurately separate impurities, defective grains, and diseased grains based on their size, shape, color, and other characteristics, ensuring excellent grain quality.

Intelligent control: The grain color sorter is equipped with an advanced intelligent control system, which can adapt to different grain varieties and processing requirements through real-time monitoring and automatic adjustment, providing the best color sorting effect.

Enhanced durability: The Mihoshi Valley selection machine adopts high-quality materials and precise processing technology, with high durability and stability, and can operate stably for a long time.

Mihoshi Valley's advantages in searching and selecting machines

The advantages of choosing Mihoshi Valley for machine selection are as follows:

Reliable Quality: As a well-known brand in the agricultural machinery industry, Mihoshi has always focused on product quality and technological innovation. Choosing the Mihoshi Valley sorting machine allows you to use it with confidence and achieve excellent sorting results. Mihosh

Widely applicable: Mihoshi grain color sorter can be used for sorting various grains, including wheat, rice, corn, etc. It has a wide range of applications and can meet the needs of different crops.

User friendly: The Mihoshi grain color sorter has a simple and easy to understand operating interface and user-friendly design, making it easy for even users without professional knowledge to operate and improve work efficiency.

Customer Service: Mihoshi provides comprehensive pre-sales consultation and after-sales service, including equipment installation, maintenance, etc., to ensure that users receive timely support and assistance during the purchase and use process.

Mihoshi grain color sorter, with its advanced technology and excellent quality, has become an important tool for production and processing companies to improve production efficiency and ensure grain quality. When choosing a grain color sorter, you can consider the Mihoshi brand products produced by Meixing Intelligent Technology Company, and choose the appropriate model and configuration according to your own needs to improve the quality and efficiency of agricultural production.

Rice is one of the most important staple foods for people, and for most people, three meals a day revolve around rice. If the quality of rice is not up to standard, it will directly affect people's physical health, increase the demand for rice quality, and promote the continuous improvement of rice technology and equipment.

The rice entering the color sorter must not contain any crushed stones, metal materials, or other substances. This requires the installation of effective magnetic separators, high-efficiency vibrating screens, density grading stone removal machines, and other machines during the initial cleaning stage to remove as much residue as possible, reduce color particles and other components, relieve the pressure on the color sorter, fully utilize the initial cleaning function, and improve the working efficiency of the color sorter.

Rice enters the machine from the top hopper, and through the vibration of the vibrator device, the rice slides down the channel, accelerates its descent into the observation area of the sorting chamber, and passes between the sensor and the background plate. Under the action of the light source, the system generates output signals to drive the solenoid valve to blow out particles of different colors into the waste chamber of the receiving hopper according to the strength and color changes of the light, while the good rice continues to fall into the finished product chamber of the receiving hopper, thus achieving the purpose of selection. The beige color sorting machine can screen out rice grains with different colors, effectively improving rice quality, reducing rice loss, and lowering processing costs.

For consumers, only rice with good quality and no impurities can motivate them to purchase. Undoubtedly, rice production enterprises are facing challenges and need to 100% remove particles and impurities with different colors, such as coal slag, small glass, black rice grains, etc. The Meixing beige color sorter can fully meet these requirements.