Temperature Overshoot Problem of Environmental Chamber During Detection

 The temperature chamber and the temperature humidity chamber are two important types of simulated enironmental chambers in envrionemntal chamber. These temperature humiditychambers is widely used in electronics, machinery, chemical, construction and other industries. It provides a reliable artificial environment for environmental adaptability research of various equipment, materials and components.

High low temperature chamber has been widely used in electronics industry and some industries with high precision requirements. However, as processes and technologies improve, the ability to test chamber is increasing. Many different testing requirements and testing indicators will be encountered during the testing process.

For example, the current constant temperature humidity chamber is required to be tested under low temperature and low humidity conditions. The thermal shock chamber requires temperature changes above 30 °C per minute and so on. This brings certain difficulties to the test and puts higher demands on the ability of the test equipment.

What is Temperature Overshoot?

Temperature overshoot is the phenomenon that when the temperature of the studio exceeds the set temperature by more than 5 °C for the first time, it is slowly lowered and stabilized at the set temperature. Some pharmaceutical, biological, chemical, food, electronics and other industries are relatively sensitive to this phenomenon.

Hazards of Temperature Overshoot

The product inspection practice tells us that the temperature overshoot generated by the temperature test chamber during the startup and each heating and heat preservation process is very harmful to the tested product. Especially for temperature sensitive products and gluing materials, transient overshoot temperatures can cause damage to the product and failure of the glue.

Cause of Temperature Overshoot

Wrong Usage of Environmental Chamber

Temperature overshoot also occurs in users who are not very clear about the use of the environmental chamber. For example, many domestic environmental chambers now use two sets of heaters for heating. This is provided by the manufacturer in order to distribute the heating power reasonably. Many users directly turn on two sets of heating during use of the environmental chamber. This causes the temperature to always be near the upper limit of the index.

If the accuracy of the environmental chamber’s control system is low, intermittent overshoot may occur. This makes the environmental chamber unstable at the set point. This situation is basically due to the overshoot of the temperature caused by the user’s lack of understanding of the environmental chamber, which is better solved. Just adjust the temperature chamber settings. However, it should be noted that it is best to adjust the temperature of the environmental chamber to the non-test temperature point during the adjustment process, and then let the temperature chamber work again. This effect is better, but also pay attention to whether the ability of the environmental chamber itself can meet the requirements of the test.

Instrument Accuracy of Environmental Chamber

The cause of temperature overshoot is also the problem of meter accuracy. The accuracy of the tables used by the general test equipment manufacturers is relatively low and the reaction rate is relatively slow. This caused the temperature inside the chamber to be already high, but the meter did not respond. In addition, many high temperature chamber are not equipped with low-temperature equipment such as compressors and cooling water. Therefore, after the temperature overshoot, only natural cooling occurs, which causes temperature overshoot. Some equipment due to this reason, the temperature can reach more than 10 ℃. If the test article is at the limit temperature, it is undoubted that such a test will generate a lot of waste.

Probe Placement of Environmental Chamber

The cause of the temperature overshoot is also the placement of the probe and the direction of the agitation wind. It has been proved by experiments that placing the probe at the position of the air outlet is a better method. In addition, for windless environmental chamber, the probe is best placed at the geometric center point of the interior volume of the environmental chamber.
However, if the reaction speed of the probe and the accuracy of the meter are not enough, the temperature will be overshooted. This is due to the control principle. Because the probe is located at the air outlet. Therefore, the temperature during heating is higher than the temperature of other parts of the environmental chamber.

Therefore, when the sensing temperature of the probe does not reach the set value, the heating part of the environmental chamber will be heated at full power. After reaching the temperature, the heating part stops the full power heating and becomes intermittent heating. And the temperature of each point in the test chamber is gradually leveled under the stirring of the stirring wind.

Our Environmental Chamber

Our environmental chambers’ temperature overshoot is ≤ ± 2 ° C. Besides, it is equipped with Tecumseh (France)-fully air-cooled double-fall cooling compressor or Bock (Germany) semi-enclosed air-cooled refrigeration. So whether your product is temperature sensitive or otherwise, you can safely choose our equipment for testing!

We are a manufacturer of environmental chamber and battery testing equipment with 18 years of production and R&D experience. If you need environmental chamber or battery testing equipment, please contact us!

Comments

Post a Comment

Popular posts from this blog

The System of High Low Temperature Chamber, Temperature Humidity Test Chamber

Image
  Interpretation of environmental simulation tests: There is all kind of environments in nature: high temperature, low temperature, humidity, ultraviolet light, sunlight, rain, etc. Different natural environments affect all kinds of our lives to varying degrees. An environmental simulation test is an activity performed to maintain functional reliability in all environments of expected use, transportation, or storage. It is to expose the product to natural or artificial environmental conditions to undergo its effects, in order to evaluate the performance of the product in the actual use, transportation, and storage of environmental conditions, and to analyze and study the degree of influence of environmental factors and their mechanisms. Introduce our Bell’s high and low temperature test chambers, constant temperature and humidity test chambers, both of which are also environmental chambers for battery safety.       The following introduces our environmental test chamber systems, suc
Read more

High and Low Temperature Environmental Chamber — Test the Temperature Resistance of Products

  Temperature is the inevitable stress that every product of materials experiences at the testing stage after development. How the product or material reacts to the effect of stress might differ from each other. When people purchase electronics they use it differently, while some may use the electronic products as recommended by the manufacturer others will typically abuse it. This is why each manufactured product needs to undergo temperature qualifications, life testing, and other additional evaluation before officially introducing it in the marketplace. These products at the initial developmental stage are subjected to a series of temperature testing ranging from high to low. There are many things to consider when ensuring the safety of developed products for customers and so of the questions you’re looking for its answer might include:   What is a high and low temperature environmental chamber? Environmental chambers come with different features that include high temperature and low
Read more

5 Aspects to Comprehensive Understanding of the Salt Spray Chamber

The salt spray method is a popular process, which ensures that materials and products are tested for corrosion determining its ability to adapt to certain environmental conditions. This process requires the use of a testing chamber to check the corrosion resistance of different products or materials surface. The use of salt spray method applies to certain metallic materials and products, which can be metals, alloys, and others. Products that are finished with a surface coating of metallic will require  salt spray testing  to determine the degree of corrosion. During the testing period, the salt spray produces a corrosive attack on the material to evaluate its degree of sustainability or amount of damages the material incurs at certain conditions. The salt spray testing period depends on the material’s ability to resist corrosion, which can be due to its coating or finishing features. This means that the higher the material’s ability to resist corrosion, the longer it will take the test
Read more