How to buy temperature humidity test chamber correctly
Temperature humidity test chamber can simulate temperature, humidity, air pressure, light, vibration, corrosion and other different environmental conditions, usually by the control system, heating system, refrigeration system, humidity control system, air pressure control system, lighting system, vibration system, corrosion system and other components. According to the test requirements, different environmental parameters can be selected for adjustment to simulate the required environmental conditions.
There are many kinds of temperature humidity test chamber, and for people who are not familiar with temperature humidity chamber and are buying them for the first time, choosing temperature humidity chamber is a 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 humidity chamber, you can contact our technical staff. We will give you a satisfactory answer in the first time.
Test requirements
First of all, it is necessary to clarify the product type, test parameters and test standards required to select an temperature humidity test chamber that meets the test needs. When choosing the right environmental test chamber for your needs, it is important to analyze your test requirements in detail. First consider the type of environment you want to test and whether that environment 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 shock, salt spray, wet heat, vibration, drop and other tests to assess their reliability and durability in different environments.
Selection of temperature range
The range of foreign temperature and humidity controlled cabinet is generally -73~+177℃ or -70~180℃. Most of the products of domestic manufacturers are -80~+130℃, -60~+130℃, -40~+130℃, high temperature to 150℃. These temperature ranges can usually meet the needs of most domestic military and civilian temperature tests.
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), for the same absolute moisture content, the higher the temperature, the lower the relative humidity. For example, the absolute moisture content is 5g/kg, and when the temperature is 29 ° C, the relative humidity is 20%RH. When the temperature is 6°C, the relative humidity is 90% RH. When the temperature drops below 4 C and the relative humidity exceeds 100%, condensation will occur in the box. The temperature index of temperature and humidity controlled cabinet at home and abroad is generally 20~98%RH or 30~98%RH. If the Temperature humidity test chamber does not have a dehumidification system, the temperature range is 60-98%. This test chamber can only carry out high humidity tests, but the price is much cheaper. It is worth noting that the humidity indicator should be marked with the corresponding temperature range or minimum dew point temperature. Because relative humidity is directly related to temperature
Control accuracy
The control precision of Temperature humidity test chamber has an important influence on the accuracy and reliability of test results. The appropriate control accuracy needs to be selected according to the test requirements. Generally, the higher the control accuracy, the higher the price of the equipment will be. The relative humidity deviation of the temperature and humidity controlled cabinet 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 ° C, otherwise it is difficult to meet the requirements of humidity control accuracy.
Wind Speed
According to relevant standards, when conducting environmental tests, the wind speed in the temperature and humidity test chamber should be less than 1.7m/s. However, if a rapid temperature change test chamber and a multi-factor comprehensive environmental test chamber such as temperature, humidity and vibration are needed, the flow rate of circulating air in the tank can be accelerated. The wind speed is usually 2~3 m/s. For most general test requirements, the wind speed of thetemperature humidity chamber is generally between 0.5 m/s and 2.5 m/s, and the wind speed in this range can meet most test needs. 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 the testing of auto parts, the common wind speed range is 1.5 m/s to 2.5 m/s.
