System principle of constant temperature humidity chamber

The constant temperature humidity chamber is composed of six systems: control, humidity, refrigeration, heating, air circulation, and sensors. The working principles of these systems are:
1. The control system is the core of a constant temperature humidity chamber, which determines some important indicators such as the heating rate and accuracy of the constant temperature humidity chamber. Since the control system basically belongs to the category of software, there are generally no problems during the use process.

2. The humidity system is divided into two systems: a humidification system and a dehumidification system. The humidification method for a constant temperature humidity chamber generally adopts the steam humidification method, while there are two dehumidification methods: mechanical refrigeration dehumidification and drying dehumidification.

3. The refrigeration system is the key part of the constant temperature humidity chamber. The refrigeration system of the constant temperature humidity chamber produced by LISUN consists of two parts, called the high temperature part and the low temperature part, respectively. Each part is a relatively independent refrigeration system. Therefore, this aspect of the refrigeration system is completely harmful to Linpin Company.

4. The heating system is relatively simple for a refrigeration system. It is mainly composed of high-power resistance wires. Because the required heating rate of the test chamber is relatively large, the heating system power of the test chamber is relatively large.

5. The air circulation system generally consists of a centrifugal fan and a motor that drives its operation. It provides circulation of air within a constant temperature humidity test chamber.

6. The sensors of the constant temperature humidity chamber mainly include temperature and humidity sensors.

Equipment characteristics of constant temperature humidity chamber:
The constant-temperature and constant-humidity testing machine adopts a CNC machine tool to process and shape the chamber, which is beautiful, elegant, and novel in shape. It also adopts a non reaction handle, which is easy to operate. The ultra-fine insulation cotton is filled between the outside of the chamber and the tank, which has a good temperature insulation effect, effectively reducing the temperature fluctuation rate in the test chamber, and combined with the tight sealing of anti-aging silicone rubber sealing strip, so that the chamber has no fog leakage.

The working room of the constant temperature humidity chamber is made of advanced stainless steel with imported mirror panels, and the outer tank of the chamber is made of A3 steel plate spray molding. The high-temperature part and the low-temperature part are connected by an evaporative condenser, which is both a condenser for the high-temperature part and a condenser for the low-temperature part. Humidification is a major part of the constant temperature and humidity test chamber, which is different from the high and low temperature test chamber. The constant temperature and humidity test chamber adopts an external isolation type, all stainless steel boiler type shallow surface evaporation humidifier.

Several cases of problems with constant temperature humidity chamber:
1. Solution for device power failure: Check the power cord. It may be that the power cord is not properly plugged in or disconnected.
2. Solution to open circuit of equipment fuse: Plug in the power plug and check the power cord. If there is no problem, replace the fuse.
3. Solution for non rising temperature in the equipment chamber: The temperature controller may be damaged or the temperature setting may be low.
4. Solution to damage to the equipment’s electric heater: You can adjust the set temperature, replace the temperature controller, and replace the electric heater.
5. The refrigeration effect of the equipment is too poor or does not cool, possibly due to a refrigerant leak.
6. There is a problem with the axial flow fan of the device, and there is no way to resolve it by yourself, but you can contact the dealer or manufacturer.
7. After the equipment is powered on, the compressor does not work, which may be due to unstable power supply voltage or damage to the compressor. You can check the voltage strength.

Precautions for measurement in a constant temperature and humidity chamber:
1. When reading the indicated value of the constant temperature and humidity chamber hygrometer, the front and back time should be as short as possible, and the simultaneous reading at three points should be carried out as much as possible, and attention should be paid to the unity of the reader’s vision. With the same thermometer, read the wet bulb temperature first.

2. The fluctuation of the temperature and humidity curve automatically recorded by the temperature and humidity meter configured inside the device should be basically consistent with the data measured by the humidity meter, otherwise the recording is considered inaccurate. The temperature and humidity of the constant temperature and humidity test chamber must meet the standard requirements, and the recorded temperature and relative humidity must be within the allowable limits for all times.

3. When reading the indicated value of the hygrometer, objects with different temperatures from the device, such as the hands and face of the human body, should be kept as far away from sensitive mercury spheres as possible.

There are six standards for purchasing a constant temperature and humidity chamber:
1. The temperature range and equipment temperature range can be analyzed from the reference high and low temperature values.
2. Circulation function: Does the device have a temperature circulation function? It can be analyzed from the repeated cycle switching curve cycle between temperatures.
3.  Humidity range: Whether the device has the function of humidity, and the approximate temperature range.
4. Thermal loads are commonly used for power-on testing of electronic products. During power-on testing, the product under test must generate heat, which can generate loads. Therefore, it is important to pay attention to explaining the load to the manufacturer when purchasing equipment.
5. For equipment handling, refer to the overall dimensions of the equipment to determine the location of the equipment arrangement.
6.  Check whether the power supply of the equipment matches the installed laboratory power supply.

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.

GDJS-015B Temperature Humidity Chamber | Thermal Chamber

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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