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Constant Temperature and Humidity Chamber

Table of Contents

Fundamental Operating Principles of Temperature and Humidity Chambers

Constant Temperature and Humidity Chambers (CTHCs) are precision environmental testing devices designed to simulate controlled climatic conditions for product validation. These chambers operate on thermodynamic and psychrometric principles, regulating temperature and relative humidity (RH) within tightly defined parameters.

The GDJS-015B model by LISUN exemplifies this technology, utilizing a closed-loop feedback system with PID (Proportional-Integral-Derivative) control to maintain stability. The refrigeration cycle employs a cascade compressor system for rapid cooling, while electric heating elements and steam humidification ensure precise thermal and hygroscopic adjustments. Humidity control is achieved through a combination of ultrasonic atomization and desiccant dehumidification, allowing for RH ranges from 20% to 98% with minimal deviation (±2%).

Critical Specifications and Performance Metrics of the GDJS-015B

The GDJS-015B is engineered for high-precision testing, with the following key specifications:

Parameter Specification
Temperature Range -70°C to +150°C
Humidity Range 20% to 98% RH
Temperature Fluctuation ±0.5°C
Humidity Fluctuation ±2% RH
Heating Rate 3°C/min (average)
Cooling Rate 1°C/min (average)
Chamber Volume 150L
Power Supply AC 220V ±10%, 50Hz

These metrics ensure compliance with IEC 60068-2-1, IEC 60068-2-2, and MIL-STD-810G, making the GDJS-015B suitable for rigorous environmental stress screening (ESS) in multiple industries.

Industry-Specific Applications and Compliance Testing

Electrical and Electronic Equipment

Semiconductors, PCBs, and microcontrollers undergo accelerated aging tests in CTHCs to assess thermal cycling endurance. The GDJS-015B simulates extreme storage conditions (-40°C to +85°C, 85% RH) to verify solder joint integrity and moisture resistance per JEDEC JESD22-A104.

Automotive Electronics

Automotive ECUs, sensors, and infotainment systems must withstand harsh climates. The chamber’s rapid transition capability (-40°C to +125°C in <30 minutes) aligns with ISO 16750-4, ensuring reliability in sub-zero winters and desert heat.

Medical Devices

Implantable devices and diagnostic equipment require validation under long-term humidity exposure (40°C, 93% RH for 56 days per ISO 10993-1). The GDJS-015B’s corrosion-resistant stainless steel interior prevents contamination.

Aerospace and Aviation Components

Avionics systems are tested against rapid decompression and condensation effects. The chamber’s low-temperature stability (-70°C ±1°C) meets RTCA DO-160 Section 4.6 for altitude simulation.

Competitive Advantages of the GDJS-015B in Precision Testing

  1. Multi-Stage Refrigeration System – Unlike single-compressor designs, the GDJS-015B’s dual-cascade cooling ensures consistent performance at ultra-low temperatures (-70°C) without compressor overload.
  2. Dynamic Humidity Control – Advanced PID algorithms adjust steam injection in real-time, preventing overshoot during RH transitions.
  3. Energy-Efficient Operation – Insulated polyurethane panels and variable-speed fans reduce power consumption by 15% compared to conventional models.
  4. Modular Data Logging – RS-485 and Ethernet interfaces enable real-time monitoring and compliance reporting for FDA 21 CFR Part 11 and GMP environments.

Comparative Analysis with Alternative Testing Methods

Traditional thermal shock chambers lack humidity control, while benchtop hygrometers offer limited volume. The GDJS-015B bridges this gap with a 150L workspace, enabling batch testing of larger assemblies like server racks or LED lighting arrays. In contrast to the HLST-500D (focused on high-temperature stability up to 500°C), the GDJS-015B provides broader climatic versatility.

FAQs: Technical and Operational Considerations

Q1: What is the maximum load capacity for the GDJS-015B?
A: The chamber supports up to 30kg of test specimens, distributed evenly to avoid airflow obstruction.

Q2: How does the GDJS-015B prevent frost accumulation at sub-zero temperatures?
A: A heated door gasket and automatic defrost cycle minimize ice formation during prolonged -70°C operation.

Q3: Which industries require combined temperature-humidity testing?
A: Telecommunications (5G base stations), automotive (ADAS sensors), and consumer electronics (water-resistant wearables) mandate such validation.

Q4: Can the chamber simulate tropical conditions?
A: Yes, the GDJS-015B replicates 55°C at 95% RH, critical for testing battery packs in Southeast Asian markets.

Q5: What maintenance is required for the humidification system?
A: Monthly cleaning of the water tank and ultrasonic transducers prevents mineral buildup, ensuring ±2% RH accuracy.

By integrating rigorous testing standards with advanced engineering, the GDJS-015B establishes itself as a benchmark for environmental simulation across critical industries. Its precision, reliability, and adaptability make it indispensable for quality assurance in evolving technological landscapes.

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