In modern industrial production and scientific research, high-low temperature and humidity alternating test chambers are critical environmental testing devices widely used in industries such as electronics, telecommunications, automotive, aerospace, and materials science. These chambers simulate extreme conditions, including high temperatures, low temperatures, high humidity, and low humidity, to evaluate product performance and reliability under diverse environmental conditions.
LISUN, a renowned domestic manufacturer of environmental testing equipment, is celebrated for the advanced technology and stable performance of its high-low temperature and humidity alternating test chambers, such as the GDJS-015B model. However, during operation, particularly in high-humidity test modes, these chambers may influence the chamber humidity, which in turn affects the indoor humidity of the laboratory or testing environment. This article focuses on chamber humidity as the core keyword, exploring the working principles of the LISUN test chamber, its potential impact on indoor humidity, factors influencing this impact, and effective measures to control indoor humidity, providing technical insights and operational guidance for users.
GDJS-015B Temperature Humidity Chamber | Thermal Chamber
The LISUN high-low temperature and humidity alternating test chamber (e.g., GDJS-015B) is a sophisticated device integrating temperature and humidity control, capable of simulating temperatures ranging from -70°C to +150°C and relative humidity from 10% to 98%. Its primary operational mechanisms include:
• Temperature Control System
The chamber achieves precise temperature regulation through a refrigeration system using compressors and an electric heating system. The refrigeration system employs refrigerant circulation to lower the internal temperature, while the heating system uses electric heating tubes to raise it. High-precision temperature sensors and controllers ensure temperature fluctuations remain within ±0.5°C, maintaining stable conditions within the chamber.
• Humidity Control System
Humidity control is a central feature of the test chamber, directly influencing chamber humidity. The equipment incorporates a built-in humidifier, typically utilizing ultrasonic or steam humidification technology, and a dehumidification system based on condensation principles. The humidifier increases chamber humidity by atomizing or evaporating water into the chamber, while the dehumidification system reduces moisture content by condensing water vapor through a condenser, enabling low-humidity environments.
• Air Circulation System
An efficient air circulation system ensures uniform distribution of temperature and chamber humidity. Fans drive air circulation within the chamber, minimizing localized temperature and humidity variations, thereby enhancing test accuracy and consistency.
• Environmental Isolation Design
To maintain stable test conditions, the LISUN test chamber features a highly sealed design to prevent external environmental interference. It is equipped with multilayer insulation materials and sealing strips to reduce heat and moisture leakage, ensuring that chamber humidity remains isolated from the external environment.
The synergistic operation of these systems enables the test chamber to precisely simulate various temperature and humidity conditions. However, the humidification and dehumidification processes, which directly affect chamber humidity, may indirectly influence the indoor humidity of the laboratory, especially during high-humidity tests or prolonged operation.
Indoor humidity refers to the percentage of water vapor content in indoor air relative to the total air volume, typically expressed as relative humidity (RH%). A range of 40%–60% RH is considered optimal for human comfort and the preservation of laboratory equipment, samples, and indoor items. The chamber humidity generated during testing can influence indoor humidity, and excessively high indoor humidity (e.g., above 70% RH) may cause several issues:
• Damp Air: High humidity creates a sticky atmosphere, reducing comfort and potentially causing respiratory discomfort.
• Mold Growth: A humid environment fosters mold growth on experimental samples, equipment, or indoor items, compromising test results and equipment longevity.
• Bacterial Proliferation: Elevated humidity provides favorable conditions for bacteria and mold, increasing health risks.
• Equipment Corrosion: Prolonged high-humidity conditions may corrode metal components, reducing the reliability of laboratory equipment.
Conversely, excessively low indoor humidity (below 30% RH) can lead to dry skin, static electricity buildup, and other issues detrimental to the laboratory environment. Thus, understanding and controlling indoor humidity, influenced by chamber humidity, is a critical aspect of laboratory management, particularly when operating high-low temperature and humidity alternating test chambers.
During operation, especially in high-humidity test modes, the LISUN test chamber may affect indoor humidity through chamber humidity via the following mechanisms:
• Moisture Leakage
Despite the chamber’s high-seal design, moisture leakage can occur if the door is opened, sealing strips degrade, or maintenance is inadequate. For example, during a 98% RH high-humidity test, the chamber humidity is extremely high due to elevated water vapor content. If the seal is compromised, this moisture may escape into the laboratory, increasing indoor humidity.
• Indirect Effects of Humidifier Operation
The humidifier generates substantial water vapor to maintain high chamber humidity. Some chambers may expel excess moisture through an exhaust system. If the exhaust is not directed outdoors or the laboratory’s ventilation is insufficient, the discharged moisture may accumulate indoors, elevating indoor humidity.
• Condensate Water Discharge
During dehumidification or low-temperature tests, the chamber condenses excess water vapor from the chamber humidity into liquid form, which is discharged through a drainage system. If the drainage system is clogged or poorly designed, condensate water may pool near the equipment and evaporate, contributing to higher indoor humidity.
• Frequent Door Opening
Frequent opening of the chamber door during testing allows high chamber humidity to escape directly into the laboratory environment, particularly during high-humidity test phases, amplifying the impact on indoor humidity.
• Laboratory Ventilation Conditions
If the laboratory’s ventilation system cannot efficiently replace air, moisture from the chamber humidity may linger indoors, causing a sustained increase in indoor humidity.
Research indicates that indoor humidity exceeding 70% RH can trigger moisture-related issues. When operating the LISUN test chamber in high-humidity modes (e.g., above 85% RH), inadequate management of chamber humidity may push laboratory indoor humidity beyond this threshold.
The extent to which the LISUN test chamber affects indoor humidity through chamber humidity depends on several factors:
• Sealing Performance of the Test Chamber
High-quality sealing designs, such as the double-layer silicone sealing strips in the GDJS-015B model, effectively reduce moisture leakage from chamber humidity. The condition of the sealing strips, installation accuracy, and frequency of door operation influence the extent of moisture escape.
• Test Condition Settings
High-humidity tests (e.g., 85°C/85% RH) produce greater chamber humidity than low-humidity tests (e.g., 25°C/40% RH), resulting in a more significant impact on indoor humidity. High chamber humidity generates more water vapor, increasing the likelihood of leakage or exhaust-related moisture affecting the indoor environment.
• Laboratory Environmental Conditions
The laboratory’s ventilation capacity, air conditioning dehumidification capabilities, and baseline indoor humidity levels affect the test chamber’s impact. A well-ventilated laboratory can quickly dilute moisture from chamber humidity, while a poorly ventilated environment may allow humidity to accumulate.
• Equipment Maintenance Status
The cleanliness and maintenance of the humidifier water tank, drainage system, and condenser directly affect the stability of chamber humidity. Clogged drainage pipes or scaling in the humidifier can lead to abnormal moisture discharge, impacting indoor humidity.
Adherence to proper operational procedures influences chamber humidity leakage. Minimizing unnecessary door openings, regularly inspecting sealing strips, and maintaining the drainage system can reduce the risk of moisture escaping into the indoor environment.
To minimize the impact of the LISUN test chamber’s chamber humidity on indoor humidity and maintain a comfortable and safe laboratory environment, the following measures are recommended:
• Optimize Laboratory Ventilation
Ensure the laboratory is equipped with an efficient ventilation system to promptly remove moisture from chamber humidity that may leak or be discharged. If necessary, connect the chamber’s exhaust port to an outdoor duct to prevent moisture accumulation indoors.
• Use Dehumidification Equipment
During high-humidity tests, install a dehumidifier or activate the air conditioner’s dehumidification function to rapidly reduce indoor humidity influenced by chamber humidity. Dehumidifiers should be regularly cleaned and maintained for optimal performance.
• Regular Maintenance of the Test Chamber
Inspect Sealing Strips: Regularly check the integrity of door sealing strips and replace any worn or damaged components to minimize chamber humidity leakage.
Clean Humidifier and Drainage System: Avoid using poor-quality additives in the water tank, and periodically clean the tank and drainage pipes to prevent condensate water accumulation or evaporation.
Check Float Switches: Ensure water level float switches function correctly to avoid humidification issues due to scaling, which could affect chamber humidity stability.
• Standardize Operational Procedures
Minimize frequent opening of the chamber door, particularly during high-humidity tests, and open the door only after the test concludes, if possible, to prevent chamber humidity from escaping.
Before high-humidity tests, verify that indoor humidity is within the optimal range (40%–60% RH) to mitigate the impact of chamber humidity.
• Monitor Indoor Humidity
Install high-precision hygrometers in the laboratory to monitor indoor humidity changes influenced by chamber humidity in real time. If humidity exceeds 70% RH, immediately implement dehumidification measures to protect the laboratory environment and equipment.
• Optimize Test Condition Settings
Whenever possible, avoid prolonged high-humidity tests (e.g., 98% RH) or alternate between low- and high-humidity tests to reduce chamber humidity accumulation and its impact on indoor humidity.
In an electronics testing laboratory, a LISUN GDJS-015B test chamber was used to conduct humidity resistance tests on mobile phone components under conditions of 85°C/85% RH for 48 hours. Initially, the laboratory lacked dehumidification equipment and had poor ventilation, causing indoor humidity to rise from 50% RH to 75% RH due to high chamber humidity. This led to slight mold growth on test sample surfaces. Analysis revealed that the issues stemmed from the test chamber’s exhaust port not being connected to an outdoor duct and frequent door openings causing chamber humidity leakage.
Improvements included:
• Connecting the test chamber’s exhaust port to an outdoor ventilation duct.
• Installing a dehumidifier to maintain indoor humidity at approximately 50% RH.
• Optimizing operational procedures to reduce door openings.
After implementing these measures, indoor humidity stabilized at 45%–55% RH, significantly improving test results and laboratory comfort, while effectively managing the impact of chamber humidity.
The LISUN high-low temperature and humidity alternating test chamber is a high-performance environmental testing device with significant advantages in simulating extreme temperature and humidity conditions. However, its operation, particularly in high-humidity modes, may influence indoor humidity through chamber humidity. By optimizing laboratory ventilation, using dehumidifiers, regularly maintaining the test chamber, standardizing operational procedures, and monitoring indoor humidity, users can effectively control the impact of chamber humidity, ensuring a stable and comfortable laboratory environment.
For users of LISUN test chambers, developing a scientific humidity management strategy tailored to the laboratory’s specific conditions and testing requirements is essential to mitigate the effects of chamber humidity. This approach ensures accurate test results and enhances equipment longevity. As environmental testing technology advances, LISUN may introduce more intelligent moisture management systems, further reducing the impact of chamber humidity on indoor humidity and providing users with more efficient and eco-friendly testing solutions.
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