Environmental test chambers, also known as temperature and humidity environment chamber, climate chamber, is commonly used in laboratories and factories for environmental simulation systems and devices. Environmental test chamber can simulate temperature, humidity, air pressure, light, vibration, corrosion and other different environmental conditions. The test chamber is usually composed of control system, heating system, refrigeration system, humidity control system, air pressure control system, lighting system, vibration system, corrosion system and so on. According to the test requirements, different environmental parameters can be selected for adjustment to simulate the required environmental conditions. There are many kinds of environment boxes. For people who are not familiar with environment boxes and who buy them for the first time, choosing environment boxes is a very headache. Therefore, through this article, I will help you to understand how to choose the right temperature and humidity environment room? In addition, if you want to know more about the standards and applications of temperature and humidity boxes, you can contact our company's technical staff. We will give you a satisfactory answer as soon as possible.
1. Test requirements
First of all, it is necessary to define the product type, test parameters and test standards to select the environmental test chamber that meets the test requirements. It is important to analyze your test requirements in detail when selecting the right environmental test chamber for your requirements. First consider the type of environment you are testing and whether it has any extreme conditions, such as temperature, humidity, or altitude. Secondly, to consider your industry, such as: electronic and electrical products industry: electronic and electrical products need to go through low temperature, high temperature, high temperature cycle, high and low temperature impact, salt spray, heat and humidity, vibration, drop and other tests, in order to assess their reliability and durability in different environments.
2. Selection of temperature range
The range of foreign temperature test chamber is generally -73~+177℃ or -70~180℃. Domestic manufacturers of products are mostly -80~+130℃, -60~+130℃, -40~+130℃, high temperature to 150℃. These temperature ranges usually meet the needs of most domestic military and civilian temperature tests.
3.Humidity range
Select the appropriate humidity range according to the test requirements. Some test chambers can simulate very high humidity (such as 95%RH or higher), while others are suitable for very dry environments (such as 0%RH) where the higher the temperature, the lower the relative humidity for the same absolute moisture content. For example, the absolute moisture content is 5g/kg, and when the temperature is 29℃, the relative humidity is 20%RH. When the temperature is 6°C, the relative humidity is 90% RH. When the temperature drops below 4℃ and the relative humidity exceeds 100%, condensation will occur in the box. The temperature index of environmental test chamber at home and abroad is generally 20~98%RH or 30~98%RH. If the constant temperature and humidity box does not have a dehumidification system, the temperature ranges from 60 to 98%. The chamber can only be used for high humidity tests, but it is much cheaper. It is important to note that the humidity indicator should be followed by the corresponding temperature range or minimum dew point temperature. Because relative humidity is directly related to temperature.
4. Control accuracy
The control precision of environmental test chamber has important influence on the accuracy and reliability of test results. The appropriate control precision needs to be selected according to the test requirements. Usually, the more accurate the control, the higher the price of the equipment. The relative humidity deviation of environmental test chamber should be ±2%RH or ±3%RH. In order to meet the requirements of temperature control accuracy, the temperature fluctuation is generally less than ±0.2℃; otherwise, it is difficult to meet the requirements of humidity control accuracy
5.Wind Speed
According to relevant standards, when conducting environmental tests, the wind speed in the temperature and humidity test box should be less than 1.7m/s. But if the need for rapid temperature change test chamber and temperature, humidity, vibration and other factors of comprehensive environmental test chamber, speed up the flow rate of circulating air in the tank. The wind speed is usually 2~3 m/s. For most general test requirements, the wind speed in the environmental test chamber is generally between 0.5 m/s and 2.5 m/s, and the wind speed in this range can meet most test requirements. For example, for the test of electronic and electrical products, the common wind speed range is 0.5 m/s to 1.5 m/s; For testing of auto parts, a common wind speed range is 1.5 m/s to 2.5 m/s.
