Challenges of Humidity Control in Environmental Test Chambers
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Challenges of Humidity Control in Environmental Test Chambers

Posted Date: 2024-01-28

Environmental test chambers are various forms of closed and controlled spaces used for product testing. The environmental conditions that may be encountered in the product life cycle are used as test conditions, such as temperature, humidity, pressure, light, salt spray, vibration, rain, Sand and dust, etc., to examine the adaptability of the product to the environment. This article mainly focuses on test equipment that requires humidity control, such as high and low temperature test chambers, drug stability test chambers, incubators, salt spray test chambers, high-altitude and low-pressure temperature and humidity test chambers, etc.

Challenges of humidity control in environmental test chambers

Measuring and controlling humidity in environmental test chambers is a critical aspect of maintaining and monitoring the environmental conditions required for many applications. When trying to control and measure humidity within these chambers, several key issues can arise:

  • Sensor Accuracy and Calibration:Accurate humidity measurement is important to maintain the required conditions within the environmental test chamber. However, sensors may drift or become less accurate over time due to contamination or age. Regular calibration and maintenance of humidity sensors are necessary to ensure accurate measurements. Experience is required to understand how to reduce downtime during calibration and avoid the negative effects of sensor drift.
  • Condensation:When there is a significant difference in temperature between the inside and outside of an environmental test chamber, condensation may form on surfaces, including sensors and other equipment. This may result in inaccurate measurements and possible damage to the equipment. Probe placement, airflow, and chamber control strategies can help avoid the negative effects of condensation.
  • Temperature and humidity interaction:Temperature and humidity are interdependent variables, and changes in temperature can affect humidity levels. Maintaining stable temperature conditions is critical for accurate humidity control and measurement.

Did you know that at 37°C and 80%rh, a ±0.5°C gradient in chamber temperature will result in a ±2.5%rh difference in humidity? Even though the true moisture content in the chamber has not changed.

  • Humidity generation and control:Generating and maintaining a certain humidity level within a chamber can be challenging. Different methods of humidity generation, such as steam injection, ultrasonic humidifiers or wet pad systems, have their own limitations and are not suitable for all applications.
  • Airflow and distribution:Uneven airflow within the chamber can lead to uneven distribution of humidity, resulting in varying conditions experienced by different samples and, in the worst case, condensation. Proper airflow design and distribution is necessary to ensure uniform humidity conditions.
  • pollute:Contaminants such as dust, chemicals or microorganisms can interfere with humidity measurement and control mechanisms, causing inaccurate readings and unstable conditions. Maintaining cleanliness and proper filtration within the chamber is critical to minimizing contamination, as is sample preparation, as test samples are often a major source of contamination and volatiles.
  • Response time:Humidity sensors and control systems may have different response times, which may affect the ability to quickly and accurately adjust humidity levels within the chamber. Choosing the right sensors and control systems for a specific application is important to ensure timely and accurate adjustments.
  • Energy consumption:Maintaining specific humidity levels within environmental test chambers consumes significant amounts of energy, especially when heating and cooling systems are required to stabilize temperature conditions. Efficient design, precise control of sensors and energy-saving measures help reduce energy consumption and related costs.

Is your application facing the above challenges? Maybe Guangzhou Haigu Electronic Technology can help you.

Guangzhou Haigu Electronic Technology Co., Ltd. specializes in the research and development, production and sales of products closely related to temperature and humidity. The company has a group of outstanding and enterprising employees, a complete set of advanced R&D and production equipment, and a reasonable corporate management system to ensure the quality of the company's products and services. The products can be used in communication equipment rooms, HVAC, family homes and other occasions where temperature and humidity need to be measured and controlled. The performance and quality of our products are being recognized by more and more customers. The services provided by the company include technical support and after-sales support for temperature and humidity application products, technical support for temperature and humidity monitoring, temperature and humidity control and other application solutions. Solving customer concerns during communication and achieving a win-win goal is the service method we advocate!

Our requirements for products are: excellence and continuous innovation.

It is our unremitting pursuit to provide customers with "timely, effective and professional" engineering and technical services.

The products include temperature and humidity sensors (components, modules), temperature and humidity transmitters, dew point meters, temperature and humidity instruments, etc., with high cost performance and in-depth services.


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