The six factors of large temperature deviation in Temperature Humidity Chamber are described

The Temperature Humidity Chamber is the key instrument for testing the temperature and humidity natural environment. It is mainly to carry out high temperature, low temperature and environmental humidity detection, and evaluate the temperature and humidity resistance characteristics of commodities to ensure that everyone’s products can operate normally under all natural environmental standards.

In the natural environment test of the equipment, if the temperature uniformity exceeds the standard range, the data information obtained from the test is unreliable, and the data results obtained from the test cannot be used as a super performance range for high and low temperature test of raw materials or commodities.

1. The difference between the detection objectives in the Temperature Humidity Chamber: if the equipment is placed in the chamber enough to affect the overall inside, the uniformity of the temperature inside the chamber (that is, the temperature uniformity) will be affected to a certain level when the equipment detects the samples for convective heat transfer. If there is a product that can emit light and heat as the heat load, it will cause a great impact on the temperature uniformity. In addition, products with high temperature specific heat capacity will also lead to excessive errors in equipment, such as aluminum.

2. Because the structure of each equipment is different, the temperature of the inner wall of the detection chamber will also be unstable, which will affect the flow of gas and cause temperature imbalance.

3. The difficulties in the internal structure and interior space design of the test chamber will also affect the uneven temperature of the equipment. In this standard, the key reflection of the sheet metal design and processing plant, such as the design of the ventilation outlet, the location of the heating pipe and the output efficiency of the centrifugal fan, will affect the temperature uniformity in the small box in the chamber.

4. The door of the Temperature Humidity Chamber is not tightly closed, such as air leakage of the door seal, and the sealant strip is not set to the joint opening. These will affect the temperature uniformity of the indoor space of the equipment in the work.

5. Because the thermal conductivity of the surface layer around the six sides of the chamber wall of the personal equipment is different, some have inspection holes, inspection holes, etc. This will cause uneven temperature of the chamber, and affect the radiation source of the test chamber, thus affecting the temperature uniformity.

6. If the volume of the test sample is large, or the test sample is placed in the working operation of the test chamber, the temperature in the chamber is not suitable for the place or method, or the air convection in the chamber will be blocked and separated, which will also lead to greater deviation of temperature uniformity.

Basic premise for operation of Temperature Humidity Chamber:
1. When the equipment is running, please do not touch it directly with your hand, otherwise the operator may get an electric shock or be injured by an electric fan, causing risks.

2. During the operation of the Temperature Humidity Chamber, it is forbidden to turn off or turn on the water chiller within 15 minutes. Unless there are special requirements, the light must be turned off at any time.

3. When the equipment is running, open the door of the chamber, or the following results will be caused: high temperature and humidity will rush out of the box; If the door of the equipment is kept at high temperature, the high temperature air will cause fire; The switch chamber of the equipment is damaged to the compressor during the test, and the design requirements are necessary, otherwise the user is not recommended to open and close the chamber door during the test.

4. The installation direction of wet ball gauze in the Temperature Humidity Chamber shall be accurate, so as to measure the accurate relative humidity. The circuit breaker and overtemperature protector of the equipment provide the machine with test commodities and environmental protection for the operator. It needs to be checked regularly and regularly. When completing a low temperature operation, the temperature range should be 60 ° C for analysis and boring skills. The door of the tank should be opened after about half an hour, so as to avoid affecting the measuring time of the later test or icing of the evaporator.

5. It is not allowed to repair and check the equipment if it is not a professional operator. Because during the inspection, there must be professional personnel to discuss, and professional electricians or circuit maintenance personnel must be together, so that the uninformed operators can switch on and off, and then spread the risk of electric shock.

Unstable operation of Temperature Humidity Chamber reveals:
First, check whether the cooler in the Temperature Humidity Chamber is started during the cooling process, that is, after the controller sets the low temperature, after about 1 minute, listen to whether the cooler at the bottom of the equipment has a starting sound, and I believe everyone can judge it. If the Temperature Humidity Chamber can be started during operation, it means that the electrical circuit from the main power supply to each Temperature Humidity Chamber is normal, and there is no problem with the electrical system.

Next is the refrigeration system. Let’s take a look at the two refrigeration groups of the Temperature Humidity Chamber. There are also some brands of Temperature Humidity Chambers that are single-stage refrigeration groups. Let’s take two refrigeration groups to analyze today. When the exhaust and suction pressure of the cooling water unit are lower than the normal value, and the suction pressure is in the evacuation state, it indicates that the refrigerant consumption of the main refrigeration unit is obviously insufficient. Touch the exhaust and suction pipes of the R23 pipe of the main unit of the Temperature Humidity Chamber again. If the temperature of the exhaust pipe is not high, the temperature of the intake pipe is not low, and the R23 pipe of the main unit is lack of refrigerant.

Reasons for errors in the test results of Temperature Humidity Chamber:
1. The sealing performance of the equipment is not good, for example, the use of non-customized sealing strips causes cracks when the door is closed, the door leaks, and then affects the uniformity and fluctuation of the temperature in the box.
2. When the sample is put into the chamber, the space in the Temperature Humidity Chamber is not well planned, resulting in uneven heat distribution, which affects the detection of data.
3. All the samples placed in the chamber are hot, and the heat emitted by the samples will affect the heat of the chamber.
4. The volume of the test sample is too large. When placed in the chamber, the air convection inside is hindered, resulting in a large deviation of temperature uniformity in the chamber.
5. Due to the different arrangement of the chamber wall, the thermal conductivity of the six sides of the chamber is also different. Some of them have threading holes, inspection holes, temperature measuring holes, etc., which cause heat dissipation and heat transfer in the chamber part, which makes the temperature of the chamber uneven and affects the thermal convection.

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.

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.

Please feel free to contact us if you need any support.
Tech Dep: Service@Lisungroup.com, Cell/WhatsApp:+8615317907381
Sales Dep: Sales@Lisungroup.com, Cell/WhatsApp:+8618117273997

Tags：GDJS-015B