Analysis of the structure and high-precision measurement of thermal resistance and humidity resistance tester

In many fields such as materials science, textiles, and construction, thermal resistance and humidity resistance performance are key indicators for measuring product quality and applicability. As the core equipment for accurately quantifying these performances, the thermal resistance and humidity resistance tester has a sophisticated and complex structure and a scientific and rigorous measurement principle, which plays a vital role in ensuring that products in various industries meet high standards.

Core structure analysisSensor unitTemperature sensor: It uses high-precision thermistors or thermocouples, has fast response and high sensitivity, can accurately capture tiny temperature changes, and provide real-time and accurate temperature data for thermal resistance measurement. Its accuracy can reach within ±0.1℃, ensuring the accuracy of heat flow measurement.

Humidity sensor: It is mostly based on capacitive or resistive principles, is highly sensitive to changes in environmental humidity, can accurately sense water vapor content, and has a resolution of up to ±0.5% RH. Whether it is a high humidity or low humidity environment, it can stably output reliable humidity values to ensure the accuracy of the humidity resistance measurement data source.

Test chamberConstant temperature and humidity chamber: build a stable temperature and humidity environment. Through the precise temperature and humidity control system, the fluctuation range is extremely small, such as temperature control at ±0.5℃, humidity ±2% RH, to meet the test requirements of different standards and provide standard test temperature and humidity fields for samples.

Sample fixture: The design is scientific and reasonable, which can not only ensure that the sample fits tightly and avoid the air gap affecting the measurement, but also apply pressure evenly to make the heat and moisture transfer occur evenly, adapt to a variety of shapes and sizes of materials, and ensure test repeatability and comparability.

Analysis of high-precision measurement principleThermal resistance measurement

Steady-state heat flow method: When the test reaches a steady state, according to Fourier's heat conduction law, by measuring the known heat flux density and the temperature difference between the two sides of the sample, the thermal resistance is accurately calculated by the formula. The heat flow measurement accuracy is ±2%, and the temperature difference measurement accuracy can reach high precision with the sensor, ensuring that the thermal resistance result is accurate to two significant digits after the decimal point.

Dynamic heat flow method: using heat pulse excitation, monitoring the temperature change curve over time, and using complex algorithms to invert thermal resistance, it has outstanding advantages in measuring thin and low thermal resistance materials, can capture instantaneous heat transfer characteristics, reduce the long-term waiting error of the steady-state method, and improve measurement efficiency and accuracy.

Wet resistance measurementWater vapor permeation method: under a fixed humidity difference, record the amount of water vapor passing through the sample per unit time, combine the test area and water vapor concentration difference, and calculate the moisture resistance according to Fick's law. The measurement accuracy of water vapor permeation can reach ±0.01g/(m²・h), accurately reflecting the moisture resistance of the material.

Electrolysis method: using the principle of water electrolysis, the water vapor passing through the sample is electrolyzed, and the moisture resistance is calculated through the quantitative relationship between the amount of electricity and the amount of water vapor. It has excellent accuracy in testing low moisture resistance and high moisture permeability materials, and provides a reliable solution for the moisture resistance measurement of special materials.

The thermal resistance and moisture resistance tester empowers the thermal and moisture performance evaluation of products in various industries with its exquisite structure and scientific measurement principles. Continuous technical optimization will further improve its accuracy and applicability, and help innovation and development in more fields.

2025-02-19 11:00