Humidity and Temperature Chamber: Performance Analysis and Application of LISUN GDJS-015B in Environmental Reliability Testing

Abstract
Humidity and temperature chamber, also known as environmental test chamber or thermal chamber, is a critical equipment designed to simulate various climatic conditions for evaluating the reliability and durability of industrial products. This paper focuses on the LISUN GDJS-015B humidity and temperature chamber, elaborating on its structural features, technical specifications, working principles, and application scenarios. By comparing it with similar products in the market, the paper highlights its advantages in temperature and humidity control precision, material selection, and compliance with international standards. The analysis confirms that the GDJS-015B effectively meets the testing requirements of diverse industries, including electronics, automotive, and lighting, providing reliable data support for product quality assessment.

1. Introduction
In modern industrial production, the performance of products under extreme environmental conditions directly determines their market competitiveness and safety. Humidity and temperature chamber plays an indispensable role in this context, as it enables the simulation of harsh climatic environments such as high/low temperature, dryness, and high humidity, thereby assessing product stability. Among various environmental testing equipment, the LISUN GDJS-015B humidity and temperature chamber stands out due to its high precision, wide applicability, and compliance with multiple international standards. This paper aims to systematically analyze the GDJS-015B, exploring its technical characteristics and practical value in industrial testing.

2. Overview of LISUN GDJS-015B Humidity and Temperature Chamber

The LISUN GDJS-015B is a member of the GDJS series, specifically designed for simulating complex climatic conditions to test the heat-endurance, cold endurance, dryness-endurance, and humidity-endurance of materials and products. Its core function is to replicate natural environmental changes, allowing manufacturers to verify whether their products meet intended performance requirements before market launch.

2.1 Design and Material

The GDJS-015B adopts a robust structure to ensure stability during long-term operation:
• Main Body: Constructed with SUS304 stainless steel, known for its corrosion resistance and high-temperature tolerance, ensuring the chamber’s durability even in extreme conditions.
• Thermal Insulation: The insulation layer combines polyurethane hard foam and ultra-fine glass fiber, minimizing heat loss and maintaining stable internal temperatures.
• Sealing: The doorframe uses high-temperature aging silicone rubber sealing strips, preventing moisture and temperature leakage, which is crucial for accurate humidity control.

3. Technical Specifications

The technical parameters of the GDJS-015B (as part of the GDJS series) are summarized in Table 1, highlighting its performance ranges and operational capabilities.
Table 1: Technical Specifications of LISUN GDJS Series (Including GDJS-015B)

Parameter	Specification
Model	GDJS-015B
Workroom Dimensions (cm)	100×100×150
External Dimensions (cm)	245×160×231
Working Power	16.5 kW
Temperature Range	A: -20℃~150℃; B: -40℃~150℃; C: -60℃~150℃; D: -70℃~150℃
Humidity Range	20%~98% R.H
Temperature Fluctuation	±0.5℃
Temperature Evenness	±2℃
Humidity Deviation	-2%~+3% R.H
Temperature Rise Speed	1.0℃~3.0℃/min
Temperature Fall Speed	0.7℃~1.0℃/min
Controller	Korean TEMI display (English/Chinese), integrated with German Siemens PLC
Safety Protection	Leakage, short circuit, over-temperature, motor overheating, compressor pressure, overload, and over-current protection

4. Compliance with International Standards

A key advantage of the GDJS-015B humidity and temperature chamber is its adherence to numerous international and national standards, ensuring its test results are recognized globally. These standards include:
• IEC 60068-2-1: Specifies cold testing procedures (Test A).
• IEC 60068-2-2: Defines dry heat testing protocols (Test B).
• IEC 60068-2-78: Covers steady-state damp heat tests (Test Cab).
• IEC 60598-1: Applies to luminaire testing requirements.
• IES LM-80-08: Provides methods for measuring LED lumen maintenance.
• GB/T 2423.17: Chinese standard for salt mist testing of electrical products.
• GB/T 5170.2 and 5170.5: Regulate inspection methods for temperature and damp heat testing equipment in China.

Compliance with these standards ensures that tests conducted using the GDJS-015B are valid for product certification in global markets.

5. Working Principle of the Humidity and Temperature Chamber

The GDJS-015B operates by precisely regulating temperature and humidity to simulate specific environmental conditions. Its functionality can be broken down into three core systems:

5.1 Temperature Control System

• Heating: Utilizes a nickel-chrome electric heater, controlled by the Siemens PLC to achieve rapid and stable temperature rises (1.0℃~3.0℃/min).
• Cooling: Employs a fully enclosed air-cooled single-stage compression refrigeration system with a French TECUMSEH compressor. This enables efficient temperature drops (0.7℃~1.0℃/min) even for extreme low-temperature ranges (-70℃).
• Circulation: A temperature-resistant, low-noise air-conditioned motor with a multi-blade centrifugal wind wheel ensures uniform air distribution, maintaining temperature evenness within ±2℃.

5.2 Humidity Control System

Humidification is achieved by increasing water vapor pressure. The chamber uses a Finland-manufactured electronic humidity sensor (PT100Ω/MV), which requires minimal maintenance compared to traditional dry ball devices. Additionally, a built-in water purification device allows direct connection to a water pipe, eliminating the need for manual water refills— a feature that enhances operational convenience.

5.3 Control and Monitoring

The chamber is equipped with a Korean TEMI display (dual language: English/Chinese) for real-time monitoring of temperature (TEMP_PV, TEMP_SV) and humidity (HUMI_PV, HUMI_SV). It also supports RS-232 communication with PCs, enabling data logging and remote control for automated testing.

6. Applications of the GDJS-015B

The GDJS-015B is widely used across industries due to its versatile testing capabilities:

6.1 Electronics and Electrical Products

LED/CFL Testing: Evaluates lumen maintenance and durability under varying temperatures and humidity, in compliance with IES LM-80-08.
Mobile Devices and Home Appliances: Tests resistance to extreme temperatures (e.g., -40℃ to 150℃) and high humidity to ensure functionality in tropical or polar regions.

6.2 Automotive Industry

Tests automotive components (e.g., sensors, wiring harnesses) for resistance to temperature fluctuations and moisture, critical for vehicle reliability in diverse climates.

6.3 Material Science

Assesses the stability of materials such as plastics, rubber, and metals under prolonged exposure to harsh conditions, aiding in material selection for product design.

7. Comparative Advantages Over Competitors
LISUN’s GDJS-015B outperforms many Chinese competitors in several key aspects:

Advantage	LISUN GDJS-015B	Competitors
Low-Temperature Warranty	Valid under 200W lamp heating load	Only valid under empty chamber conditions
Humidity Sensor	Maintenance-free Finnish electronic sensor	Prone-to-failure dry ball devices (3–6 months lifespan)
Water Supply System	Integrated water purification device with pipe connection	Requires manual water refills
Electrical Components	Schneider/Omron AC contactors and relays	Local Chinese brands (harder to replace)

These features enhance the GDJS-015B’s reliability, operational efficiency, and long-term cost-effectiveness.

8. Conclusion
The LISUN GDJS-015B humidity and temperature chamber is a high-performance environmental testing tool designed to meet the rigorous demands of modern industry. Its precise temperature and humidity control, compliance with international standards, durable construction, and user-friendly features make it indispensable for evaluating product reliability. By simulating extreme climatic conditions, it ensures that products ranging from LEDs to automotive parts can withstand real-world environments, ultimately enhancing consumer safety and satisfaction. As industries continue to globalize, the GDJS-015B will remain a key asset for manufacturers seeking to validate product quality across diverse markets.

Tags：GDJS-015B