Six factors of large temperature deviation in Temperature Humidity Chamber

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. So what affects the temperature uniformity of the equipment beyond the standard error range?

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 box 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.

Five kinds of errors easily occur in high and low temperature chambers:
① The design error violates the humanized design principle. Once the operation error occurs, it will cause equipment failure;
② Process error, process does not meet the drawing and process requirements;
③ For inspection errors, products that do not exceed the allowable error are considered as unqualified products, or products that exceed the allowable error are considered as qualified products;
④ Errors in assembly and maintenance. Assembly and maintenance do not meet the drawing and technical requirements:
⑤ Errors in operation, non-standard operation, lack of necessary steps or addition of additional steps and operation sequence, etc., reversing the operation sequence, etc; Handle the above errors, which are generated during the transportation and storage of high and low temperature boxes. Even if the above errors occur, the system may not fail immediately. However, these factors are indeed the cause of system failure. In particular, the main reasons for equipment failure are that the necessary personnel and equipment, procedure tables, technical data, logistics and other elements are not complete, and the relevant regulations and procedures for use are incomplete. Therefore, corresponding measures should be taken in the reliability design to prevent the occurrence of human failure.

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.

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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