Temperature and Humidity Test Procedure

When testing materials, electronic devices, or automotive components, replicating real-world environmental conditions is essential. Temperature and humidity extremes can significantly impact product performance, reliability, and safety. Without controlled testing, components may fail unexpectedly, causing costly downtime, recalls, or safety hazards. LIB's Temperature and Humidity Test Chambers provide precise, repeatable environmental control, enabling engineers to verify product durability under rigorous conditions while meeting international standards.

LIB's Temperature and Humidity Test chambers are designed to combine accuracy, stability, and flexibility. From fast temperature ramping to multi-zone thermal shock, our systems comply with IEC 60068, ISO 16750, UL 2580, and VW 80000, ensuring globally recognized and credible test data. With high-performance sensors, PID controllers, and uniform airflow design, LIB chambers allow you to perform complex tests efficiently, protecting your products and enhancing your R&D and quality assurance processes.

Temperature and humidity chambers function by controlling heating, cooling, and airflow precisely. Electrical resistance heaters raise temperatures quickly, while French Tecumseh compressors provide accurate cooling. Low-noise centrifugal fans circulate air in forward and reverse cycles, ensuring uniform temperature and humidity distribution. PT100 Class A sensors, combined with PID controllers, maintain conditions within ±1 °C and ±2.5% RH, minimizing gradients that could affect test results.

Fast-change-rate chambers can ramp temperatures at 5 °C, 10 °C, or 15 °C per minute, enabling accelerated stress tests. Two-zone thermal shock chambers offer separate hot (+220 °C) and cold (–75 °C) compartments, with vertical sample transfer in under 3 seconds and recovery times under 5 minutes. Three-zone chambers maintain stationary samples while redirecting hot and cold air via pneumatic dampers, ideal for large objects. Daily, weekly, monthly, and annual maintenance routines-covering sensors, fans, filters, and refrigeration-ensure long-term accuracy and reliability.

Step 1: Preparation and Inspection
Begin by connecting the power and water supply, ensuring that the voltage, water, and air source (if required) are normal. Check the chamber door seal, sensors, fans, and filters to confirm they are in proper working condition.

Step 2: Setting Test Conditions
Use the control panel to input the target temperature, humidity, and test duration. According to the testing requirements, select an appropriate program based on international standards such as IEC 60068 or ISO 16750.

Step 3: Starting Operation
Once the test is set, activate the chamber. Electrical resistance heaters will quickly raise the temperature, while the French Tecumseh compressors provide accurate cooling. At the same time, low-noise centrifugal fans circulate air in forward and reverse cycles to ensure uniform distribution of temperature and humidity throughout the chamber.

Step 4: Monitoring and Control
During operation, PT100 Class A sensors continuously monitor the internal conditions of the chamber. The PID controllers maintain stable parameters, keeping temperature fluctuation within ±1 °C and humidity deviation within ±2.5% RH to minimize gradients that may affect results.

Step 5: Performing Specific Tests
Depending on the testing objective, different programs can be executed. Fast temperature cycling allows ramp rates of 5 °C, 10 °C, or 15 °C per minute for accelerated stress tests. Two-zone thermal shock testing transfers samples between a hot chamber at +220 °C and a cold chamber at –75 °C, with transfer times under 3 seconds and recovery times under 5 minutes. In three-zone thermal shock testing, samples remain stationary while pneumatic dampers redirect hot and cold air, making it ideal for large objects.

Step 6: Test Completion and Data Recording
When the test is finished, the system automatically saves the operating data, which can be exported through USB or Ethernet for further analysis. At this stage, the samples should be inspected, and all test results carefully recorded.

Step 7: Maintenance and Servicing
After each test cycle, daily maintenance should be carried out by checking the water level, sensors, and fans. Weekly and monthly routines should include cleaning filters and inspecting the refrigeration system. Annual comprehensive servicing is recommended to ensure long-term stability, reliability, and accuracy of the test chamber.

Model	TH-100	TH-225	TH-500	TH-800	TH-1000
Internal Dimension (mm)	400*500*500	500*600*750	700*800*900	800*1000*1000	1000*1000*1000
Overall Dimension (mm)	860*1050*1620	960*1150*1860	1180*1350*2010	1280*1550*2110	1500*1550*2110
Interior Volume	100L	225L	500L	800L	1000L
Heat load	1000W
Temperature Range	A : -20℃ ～ +150 ℃ B : -40℃ ～ +150 ℃ C: -70℃ ～ +150 ℃
Temperature Fluctuation	± 0.5 ℃
Temperature Deviation	± 2.0 ℃
Humidity Range	20% ~ 98% RH
Humidity Deviation	± 2.5% RH
Cooling Rate	1 ℃ / min
Heating Rate	3 ℃ / min
Cooling	Cooling system	Mechanical compression refrigeration system
	Refrigerating unit	French TECUMSEH compressor
Observation Window	Interior lighting, double-layer thermo stability silicone rubber sealing
Standard Configuration	1 Cable hole (Φ 50), with plug; 2 shelves
Maximum Noise	65 dBA

LIB chambers provide accurate, fast, stable, and traceable testing capabilities for electronics, automotive, aerospace, and materials research. Key advantages include:

Standards Compliance: IEC 60068, ISO 16750, UL 2580, VW 80000.

Precision Control: Temperature –70 °C to +150 °C, ±0.5 °C fluctuation, humidity 20–98 % RH, ±2.5 % RH deviation.

Fast Ramp Rates: Heating 3 °C/min, cooling 1 °C/min.

Uniform Airflow: Fans and adjustable ducts eliminate hot/cold spots; multi-point uniformity testing recommended.

Advanced Safety: Over-temperature, low-water, door-open, electrical leakage, and explosion-proof options.

Operational Efficiency: Touchscreen controllers support 120 programs; data logging via USB/Ethernet; water-recycling saves up to 70% of makeup water.

LIB also offers customizations for optical holes, cable holes, explosion-proof chambers, and double-door access to suit specific testing needs without compromising accuracy or safety. 

From benchtop 50–80 L units to standing chambers (100–1000 L) and walk-in chambers exceeding 8 m³, LIB provides tailored solutions for any test scenario. High-quality SUS304 stainless steel interiors, A3 steel exteriors, and precision PID control ensure durability and repeatable performance. Optional vibration integration allows HALT/HASS testing, while multi-zone thermal shock chambers enable rapid stress assessment. Every system comes with a 3-year warranty, lifetime technical support, and delivery within 7–15 days, ensuring uninterrupted testing operations worldwide. To learn more about LIB's products, please see LIB INDUSTRY.pdf.  

LIB INDUSTRY.pdf.

Whether performing accelerated life tests, thermal shock experiments, or humidity cycles, LIB's Temperature and Humidity Test Chambers deliver reliable, standards-compliant performance for demanding applications.

Contact LIB Industry today to configure a chamber tailored for precision, efficiency, and safety-your products deserve nothing less.