Stability temperature humidity chamber working principle

Temperature Humidity Chamber | Thermal Chamber | Climate Chamber is according to IEC60068-2-1 (GB/T2423.1) and IEC60068-2-2 (GB/T2423.2), IEC60068-2-78, IEC60598-1, GB/T2423.17, GB/T5170.2, GB/T5170.5. The climate chamber is used to test the CFL/LED which meets IES LM-80-08, electricity products, automative cars, home appications and mobiles.

What is Climate Chamber?

Climate chambers is used to simulate a temperature enviromental condistions, it may also be called environmental chambers or Thermal Chamber or Temperature Chamber. You can click the below videos to learn the details and also how to operate it.

The high and low temperature & humidity chamber simulates the environment of high temperature, low temperature, high humidity, low humidity, alternating temperature and humidity, etc. It is particularly important to test the cold resistance, heat resistance, humidity resistance and dry resistance of the product, and the authenticity of the test is particularly important. . Then the equipment environment directly or indirectly affects the degree of performance of the high and low temperature alternating humidity and heat test chamber. The installation environment of the high and low temperature test chamber is as follows:
1. It should not be placed in an environment with flammable, explosive and corrosive substances;
2. It should not be placed in a place where the temperature is too low. Because the temperature is too low, the compressor is difficult to start;
3. It should be placed in a well-ventilated place. If the high and low temperature test box is full of debris, or it is too close to the wall, it is not conducive to heat dissipation and will affect the cooling effect;
4. It should be placed on a flat and solid ground, and the compressor should be kept level. This is not only required for safety, but also allows the compressor to work smoothly, reducing vibration and noise:
5. The high and low temperature test chamber should be placed in a place far away from the heat source and not exposed to direct sunlight. Because it needs to exchange heat with the outside world during work, it will dissipate heat to the outside through the condenser. The higher the external ambient temperature, the slower the heat dissipation and increase the consumption. volume, poor cooling effect;
6. The compressor should be placed in a place with low humidity. Since the shell of the high and low temperature test chamber, condenser and compressor are all metal materials, if the air humidity is too high, these parts will rust and shorten the use of the high and low temperature test box. life. At the same time, the humid and overheated environment will cause condensation on the surface of the test box and affect the performance of the machine.

How does the high and low temperature test chamber achieve high temperature and low temperature?
When it comes to temperature, there are high and low temperatures. High temperature control is a heating process, and the control is relatively simple. The heating of the high and low temperature test chamber adopts an independent heating method, and the far-infrared nickel-chromium alloy high-speed heating electric heating wire is used for the temperature control. The P•I•D+S•S•R system is coordinated and controlled by the same channel. In order to achieve high-precision and high-efficiency power consumption and to achieve fast heating rate and high temperature, it is generally by increasing the number of heating wires and improving the performance of temperature control software.

The refrigeration system of the high and low temperature test chamber adopts the unit Freon refrigeration system composed of the French-made Taikang hermetic compressor. The working principle of refrigeration is to use the reverse karyo cycle, which consists of two isothermal processes and two adiabatic processes. The refrigerant is compressed adiabatically by the compressor to a higher pressure, and the consumed work increases the exhaust temperature. The refrigerant exchanges heat with the surrounding medium isothermally through the condenser to transfer heat to the surrounding medium. This cycle is repeated to achieve the purpose of cooling. The high and low temperature test chamber adopts balanced temperature regulation (BTC). That is, in the case of continuous operation of the refrigeration system, the control system controls the output of the heater according to the set temperature point through the PID automatic calculation output result, and finally achieves a kind of dynamic equilibrium.

The following are some problems that the high and low temperature alternating test chamber may encounter when working:
1. In the high temperature test, what should I do if the temperature change does not reach the test temperature value?
In the high temperature test, if the temperature change does not reach the test temperature value, the electrical system can be checked and the faults can be eliminated one by one. If the temperature rises very slowly, it is necessary to check the air circulation system to see if the adjustment baffle of the air circulation is opened normally. Otherwise, check whether the motor of the air circulation is running normally. If the temperature overshoot is severe, then it is necessary to tune the setting parameters of the PID. If the temperature rises directly, over-temperature protection, then the controller fails, and the control instrument must be replaced.

2. During the damp heat test, what should I do if the actual humidity will reach 100% or the actual humidity is very different from the target humidity, and the value is much lower?
The former phenomenon: it may be caused by drying of the gauze on the wet bulb sensor, then check whether the water tank of the wet bulb sensor lacks water. The water level in the water tank is automatically controlled by a water level controller. Check whether the water supply system of the water level controller is not. The water supply is normal, and the water level controller works normally. Another possibility is that the wet ball gauze will become hard due to the long use time or the purity of the water supply water, so that the gauze cannot absorb water and dry. The above phenomenon can be eliminated by replacing or cleaning the gauze. The latter phenomenon is mainly that the humidification system does not work, check the water supply system of the humidification system, whether there is a certain amount of water in the water supply system, whether the water level control of the humidification boiler water level is normal, and whether the water level in the humidification boiler is normal. If all the above are normal, it is necessary to check the electrical control system, which should be repaired by professional maintenance personnel.

3. What should I do when the low temperature fails to meet the test standard?
If the low temperature does not reach the test index, then you need to observe the temperature change, whether the temperature drops very slowly, or the temperature tends to rise after the temperature reaches a certain value. Dry, keep the working room dry, and then put the test sample into the working room to do the test. Whether the test sample in the working room is placed too much, so that the wind in the working room cannot be fully circulated, after eliminating the above reasons, it is necessary to consider whether it is a fault in the refrigeration system, it is necessary to ask the professional staff of the manufacturer to repair it. The latter phenomenon is caused by the poor use environment of the equipment. The ambient temperature and location of the equipment (the distance between the back of the box and the wall) must meet the requirements (all specified in the equipment operating instructions).

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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