Temperature and Humidity Oven in Environmental Reliability Testing Across Multiple Industries

Abstract​
In the links of product R&D, production, and quality control, environmental reliability testing is a key means to verify the performance stability of products under complex climatic conditions. As a core testing equipment, the temperature and humidity oven simulates extreme climatic environments such as heat resistance, cold resistance, dry resistance, and humidity resistance, enabling accurate definition of the environmental adaptability of materials and products. This paper takes the LISUN GDJS-015B Temperature-Humidity Cycling Test Chamber  as the research object, systematically analyzes its technical principles, core parameters, and functional characteristics, and focuses on expounding its application scenarios in the CFL/LED lighting industry (complying with the IES LM-80-08 standard), electrical product field, and electronic component field. Combined with specific test cases and a technical parameter table, it demonstrates the equipment’s supporting role in improving product environmental reliability, providing references for equipment selection and testing solutions for practitioners in multiple industries.

1. Introduction​
With the globalization and complexity of product application scenarios—from high-temperature and high-humidity tropical regions to low-temperature and dry frigid zones, and from enclosed indoor environments to open-air outdoor settings—products must withstand diverse and extreme climatic challenges. Insufficient environmental reliability can lead to product performance degradation, frequent failures, and even safety hazards. Therefore, using a temperature and humidity oven to simulate real climatic environments and proactively identify issues in product design and material selection has become an essential step for all industries to ensure product quality.​

The LISUN GDJS-015B Temperature-Humidity Cycling Test Chamber is a high-precision, multi-functional environmental testing equipment. It not only features precise control and cycling capabilities for temperature and humidity but also enables complex environmental simulation processes through program control. It is widely applicable to testing needs in industries such as CFL/LED lighting, electrical appliances, and electronic components. Particularly in the CFL/LED lighting field, this equipment fully complies with the requirements of the IES LM-80-08 standard (Measurement of Luminous Flux Maintenance and Color Shift of LED Light Sources), providing a reliable technical platform for life assessment and performance stability testing of lighting products.​

2. Technical Principles and Core Characteristics of LISUN GDJS-015B Temperature and Humidity Oven​
2.1 Technical Principles​
Based on the principles of “thermodynamic cycle control” and “dynamic humidity balance,” the LISUN GDJS-015B Temperature and Humidity Oven achieves environmental simulation through four core systems:​

Temperature Control System: Adopting a dual-control structure of “imported compressor + finned evaporator + electric heating tube,” the refrigeration system uses a French Tecumseh compressor with environmentally friendly refrigerant R404A, enabling rapid temperature adjustment within the range of -40℃ to 150℃. The heating system employs stainless steel electric heating tubes, and through a PID intelligent temperature control algorithm, the temperature fluctuation is controlled within ±0.5℃, ensuring the stability of the temperature environment.​
Humidity Control System: Utilizing a dual humidification method of “ultrasonic humidification + electrode humidification” combined with dehumidification via a stainless steel evaporator, the humidity control range reaches 20% RH to 98% RH (no condensation), with a humidity fluctuation of ±3% RH. This allows precise simulation of high-humidity, low-humidity, and humidity cycling environments.​

Air Circulation System: Equipped with a multi-blade centrifugal fan and flow deflectors inside the chamber, a uniform air circulation flow is formed, with the airspeed controlled between 0.5 m/s and 1.5 m/s. This ensures the uniformity of temperature and humidity inside the chamber (temperature uniformity ≤ ±2℃, humidity uniformity ≤ ±5% RH), avoiding test result deviations caused by local environmental differences.​

Program Control System: Equipped with a 7-inch color touchscreen and a built-in PLC control system, it supports the editing of 120 programs, each with 99 segments for complex testing processes. It can set the heating/cooling rate (0.1~5℃/min for temperature) and humidification/dehumidification rate (0.1~2% RH/min for humidity), automatically record test data, and generate reports, meeting the automation requirements of long-term aging tests.​

2.2 Core Characteristics​
Wide-Range Environmental Simulation Capability: Covering a temperature range of -40℃ to 150℃ and a humidity range of 20% RH to 98% RH, it can simulate high-temperature exposure (e.g., outdoor environments above 60℃ in summer), low-temperature freezing (e.g., outdoor environments below -30℃ in northern winters), high-humidity muggy conditions (e.g., environments above 90% RH during the rainy season in southern regions), and dry low-humidity environments (e.g., environments below 20% RH in deserts), fully meeting the environmental testing needs of most industries.​

High-Precision Control: With a temperature fluctuation of ±0.5℃ and uniformity of ±2℃, and a humidity fluctuation of ±3% RH and uniformity of ±5% RH, its precision far exceeds the industry average. This ensures the repeatability and reliability of test data, complying with the precision requirements of international and national standards (such as ISO, IEC, and GB) for environmental testing equipment.​
Safety Protection Design: Equipped with multiple safety devices, including over-temperature protection (dual over-temperature alarms for the chamber interior and heating tubes), phase-failure protection, compressor overload protection, humidity over-limit protection, and leakage protection. When an abnormality occurs, the equipment automatically cuts off the power and triggers an alarm, ensuring the safety of equipment and personnel during testing.​
Compatibility and Expandability: The test chamber has a size of 450mm×400mm×850mm (150L capacity), accommodating test samples of different sizes. It supports an RS485 communication interface, enabling connection to a computer for remote monitoring and data management. Additionally, it can be customized with sample racks, test wire holes, and other accessories according to customer needs to adapt to special testing scenarios.​

3. Application Scenarios of LISUN GDJS-015B Temperature and Humidity Oven in Multiple Industries​
3.1 CFL/LED Lighting Industry (Compliant with IES LM-80-08 Standard)​
The service life and optical performance stability of CFL (Compact Fluorescent Lamp) and LED lighting fixtures are highly susceptible to temperature and humidity. High temperatures accelerate the light decay of LED chips and aging of phosphors, while high humidity causes short circuits in internal circuits and corrosion of metal components. The IES LM-80-08 standard clearly requires that LED light sources undergo luminous flux maintenance testing for at least 6000 hours under three typical temperatures (55℃, 85℃, and a customer-specified temperature). The LISUN GDJS-015B Temperature and Humidity Oven fully meets these standard requirements, with specific applications as follows:​

Luminous Flux Maintenance Testing: Fix the LED luminaire on the sample rack inside the chamber, connect it to an integrating sphere optical parameter testing system (e.g., LISUN LPCE-2 Integrating Sphere), set the temperature to 55℃, 85℃ (or the luminaire’s operating temperature specified by the customer), and the humidity to 50% RH (standard environmental humidity). Use the equipment’s program control to implement 6000 hours of continuous aging. During the test, periodically (e.g., every 1000 hours) remove the luminaire to test its luminous flux, calculate the luminous flux maintenance rate (current luminous flux / initial luminous flux × 100%), and determine whether the luminaire meets the industry qualification standard of “luminous flux maintenance rate ≥ 90% at 6000 hours.”​

Humid-Hot Environmental Reliability Testing: For outdoor LED street lamps, garden lamps, and other products, set a cycling environment of 40℃ temperature and 90% RH humidity (e.g., 8 hours of high temperature and high humidity, followed by 16 hours of normal temperature and humidity per day) and conduct a 1000-hour aging test. After the test, check whether the luminaire housing has cracks or aging sealant, whether the internal circuit has short circuits or poor contact, and whether the color coordinates of the LED light source exceed the standard deviation range (generally requiring Δx ≤ 0.007 and Δy ≤ 0.004) to verify the product’s durability in outdoor high-humidity environments.​

Low-Temperature Startup Performance Testing: For LED downlights and ceiling lamps used in cold regions, set an environment of -20℃ temperature and 30% RH humidity. After placing the luminaire in this environment for 24 hours, directly power it on to test the startup time (requiring ≤ 1 second) and initial luminous flux (needing to reach more than 90% of the rated value), preventing delayed startup or optical performance degradation caused by low temperatures, which could affect user experience.​

3.2 Electrical Product Industry​
Electrical products (e.g., refrigerators, air conditioners, washing machines, and small home appliances) undergo environmental changes during transportation, storage, and operation. The temperature and humidity oven can verify their functional stability and safety under extreme environments:​

High-Temperature Load Testing: Take a household air conditioner indoor unit as an example. Set the chamber temperature to 50℃ (simulating a high-temperature indoor environment in summer), set the air conditioner to cooling mode, and operate it continuously for 100 hours. During the test, monitor whether the cooling capacity, power consumption, and air outlet temperature of the air conditioner remain stable, and whether the compressor and fan produce abnormal noise or trigger over-temperature protection, ensuring the air conditioner operates normally in high-temperature environments.​

Low-Temperature Storage Testing: For the control panel of a washing machine (including electronic components and a plastic housing), set an environment of -30℃ temperature and 20% RH humidity. After placing it in this environment for 72 hours, remove it and let it recover at room temperature for 24 hours. Check whether the control panel housing has cracks or deformation, and whether the buttons and display screen respond normally, preventing damage to the product’s appearance and functionality due to low-temperature storage.​
Temperature-Humidity Cycling Testing: For kitchen small home appliances such as rice cookers and electric kettles, set a cycling range of 40℃~60℃ for temperature and 80% RH~95% RH for humidity (10 cycles, each lasting 12 hours). After the test, disassemble the product to check whether the internal circuit board has corrosion, whether the solder joints are loose, and whether the insulation layer of the power cord is aged, verifying the electrical safety performance of the product in high-humidity kitchen environments.​

3.3 Electronic Component Industry​
Electronic components (e.g., chips, capacitors, resistors, and connectors) are core components of electronic products, and their performance stability directly determines the quality of the entire product. The temperature and humidity oven can screen out inferior components in advance through environmental simulation, reducing the risk of failures in the entire product:​
High-Temperature Aging Testing for Chips: Install IC chips (e.g., MCU, sensor chips) on a test fixture, connect them to a pin testing system, set the chamber temperature to 125℃ (the extreme operating temperature of the chip), and conduct a 1000-hour high-temperature aging test. During the test, periodically detect whether the voltage, current, and logical functions of the chips are normal, screening out inferior chips with parameter drift or functional failure caused by high temperatures, and ensuring the reliability of chips during the operation of the entire product.​

Humidity Resistance Testing for Capacitors: For aluminum electrolytic capacitors and MLCC (Multi-Layer Ceramic Capacitors), set an environment of 85℃ temperature and 85% RH humidity, and conduct a 500-hour humid-hot aging test. After the test, measure parameters such as capacitance, dissipation factor (tanδ), and leakage current of the capacitors. The capacitance change rate is required to be ≤ ±10%, and the leakage current ≤ rated value, preventing capacitor failure caused by moisture intrusion, which could lead to circuit malfunctions.​
Cold Resistance Testing for Connectors: For plug-in components such as USB connectors and HDMI connectors, set the chamber temperature to -40℃, place the connectors in this environment for 48 hours, then remove them and conduct 1000 insertion-extraction tests at room temperature. Check whether the insertion force (needing to comply with industry standards, e.g., 20~50N for USB Type-C connectors) and contact resistance (≤ 50mΩ) of the connectors are normal, verifying the impact of low-temperature environments on the mechanical and electrical performance of the connectors.​

4. Core Technical Parameters and Adaptable Scenarios of LISUN GDJS-015B Temperature and Humidity Oven​
The LISUN GDJS-015B Temperature and Humidity Oven provides precise environmental control capabilities and flexible adaptability. Industries can select corresponding parameter configurations according to testing needs. Its core technical parameters and adaptable scenarios are shown in the table below:

As shown in the table, the temperature and humidity control range and precision of this equipment can cover the mainstream testing needs of the CFL/LED lighting, electrical appliance, and electronic component industries. The 150L chamber capacity allows simultaneous testing of multiple samples, improving testing efficiency. The 120-program storage function can meet the process requirements of different testing standards (e.g., IES LM-80-08, GB/T 2423.1, IEC 60068-2-1) without repeated parameter editing, reducing operational complexity.​

5. Conclusions 
Through precise temperature and humidity control and flexible program design, the LISUN GDJS-015B Temperature and Humidity Oven realizes the simulation of climatic conditions such as heat resistance, cold resistance, dry resistance, and humidity resistance, providing a reliable environmental reliability testing solution for industries including CFL/LED lighting, electrical appliances, and electronic components. In the CFL/LED field, its testing capability compliant with the IES LM-80-08 standard provides data support for the life assessment and performance optimization of lighting products. In the electrical appliance and electronic component fields, its wide-range environmental simulation capability can proactively identify potential product issues, improving the quality and market competitiveness of the entire product.