Research on Environmental Reliability Verification of High and Low Temperature Chamber

Abstract

The high and low temperature chamber is special testing equipment for verifying the environmental adaptability and reliability of materials and industrial products. With accurate temperature and humidity control systems, it simulates multiple natural climate conditions including low temperature resistance, high temperature heat resistance, humidity aging and alternating dry-wet cycles, reproduces dynamic fluctuations of temperature and humidity in real environments, and accelerates the assessment of product performance stability and structural reliability under extreme or cyclic climatic conditions, so as to judge whether the weather resistance of materials meets service requirements. Taking LISUN GDJS-015B high and low temperature chamber as the research object, this paper elaborates the climate simulation principle, hardware structure, core parameters, applicable standards and industrial applications of the equipment. Combined with standardized test procedures, it demonstrates the equipment performance, providing theoretical reference and equipment selection basis for environmental testing in electronics, LED, auto parts and other industries.

Core Working Principle of High and Low Temperature Chamber

The high and low temperature chamber is developed exclusively for verifying the environmental adaptability and reliability of materials and products. Its core logic is to artificially reproduce natural temperature and humidity changes and conduct accelerated climate aging assessment. In natural environments, temperature difference between day and night, seasonal temperature variation and dry-wet cycles in coastal areas may lead to failures of electronic components, LED light attenuation, plastic cracking, circuit corrosion and other problems. Long-term outdoor natural exposure takes several months, resulting in extremely low R&D efficiency.

LISUN GDJS-015B high and low temperature chamber integrates four independent modules including heating, refrigeration, humidification and circulating air, which can fully realize four typical climate working conditions: low temperature resistance, high temperature heat resistance, constant humidity aging and alternating dry-wet cycles. The equipment supports free programming of temperature and humidity change curves, and synchronously reproduces composite environments such as rapid temperature rise and drop, high humidity condensation and low temperature drying. It can complete aging damages equivalent to several years of natural exposure within a few days, directly display product performance attenuation and structural defects, and quickly judge whether the weather resistance of materials reaches the standard.

The equipment adopts PT100 platinum resistance temperature sensors and Vaisala high-precision humidity sensors, matched with a dual-core PLC control system, which delivers excellent control accuracy of temperature and humidity fluctuation and uniformity. Multiple groups of safety protection mechanisms ensure long-term continuous testing, and it is especially suitable for long-term constant temperature and humidity aging tests of LED lamps for LM-80 lumen maintenance rate.

Core Parameters of LISUN GDJS-015B High and Low Temperature Chamber

The table below lists key indicators of mainstream models in LISUN GDJS series high and low temperature chamber. GDJS-015B is a large-capacity model with inner dimensions of 100×100×150cm, suitable for batch testing of medium and large-sized lamps and automotive electronic components:

The equipment is equipped with original French Tecumseh refrigeration compressors and low-noise centrifugal circulating fans to eliminate local dead zones of temperature and humidity inside the chamber. Multiple protection functions against electric leakage, overheating and compressor overload prevent equipment failure and sample damage during long-term aging tests.

Applicable Standards and Test Procedures of High and Low Temperature Chamber

LISUN GDJS-015B high and low temperature chamber is built with a complete set of domestic and international climate test standards, including GB/T 2423 series environmental tests for electrical and electronic products, IES LM-80-08 LED lumen depreciation standard, IEC 60068 climate cycle standard, ISO 16750-4 automotive electronics standard and more than ten other specifications. Test reports are valid for market certification.

The standardized test procedure is divided into five steps: First, sample pretreatment, record initial performance data such as brightness, resistance and appearance; Second, equipment calibration, check temperature and humidity sensors and water tank water quality; Third, call standard programs and set parameters for high-low temperature and humidity cycles; Fourth, load samples for continuous alternating aging, record data remotely in real time; Fifth, place samples at room temperature for 4 hours after testing for re-measurement, compare performance changes before and after testing and judge the environmental reliability grade of products.

Industrial Application Value of High and Low Temperature Chamber

The high and low temperature chamber covers four core industries: LED lighting, electrical appliances, automotive electronics and optoelectronic components. In the LED industry, GDJS-015B is used for long-term lumen maintenance tests to troubleshoot light attenuation and sealing water leakage of lamps under high temperature and high humidity in advance. Automotive electronic parts pass high and low temperature alternation tests to verify stable operation under extreme vehicle climate conditions. Consumer electronic components adopt dry-wet cycle tests to evaluate insulation and corrosion resistance performance.

Figure: Thermal chamber

Compared with outdoor natural exposure, the high and low temperature chamber is not affected by seasons and regions. The test cycle is shortened by more than 80%. Test conditions can be fully reproduced, which facilitates enterprises to compare differences among different formulas and batches of products, and greatly reduces time costs of new product R&D and quality inspection.

Conclusion

In summary, the high and low temperature chamber is an indispensable core testing equipment for environmental reliability verification of industrial products. Represented by LISUN GDJS-015B high and low temperature chamber, it relies on a multi-module composite climate simulation system to accurately restore natural environments including low temperature, high temperature, high humidity and alternating dry-wet conditions, and accelerate exposure of potential defects of materials and products. With wide temperature range, high precision and large chamber volume, the equipment is compatible with mainstream domestic and international testing standards. It can serve R&D and factory quality inspection of the whole industrial chain of LED, automobile and electronics, provide a stable and traceable test platform for evaluating product weather resistance, and effectively improve the market reliability and service life of industrial products.