Thermal Effusivity Meter TPS-EFF

TPS-EFF (Transient Plane Source-EFFusivity) is a portable meter for the direct measurement of the thermal efusivity of textiles and other materials, in accordance with ASTM D7984-16. It uses a single-sided TPS sensor with test times of 2 and 10 seconds to understand the measurement of comfort with touch time fully.

The TPS-EFF uses a single-sided 30 mm diameter TPS sensor and short test times to ensure one-dimensional heat flow. During the measurement, the sensor is heated using a constant current source while the temperature rise of the sample is simultaneously recorded with time by monitoring the change in electrical resistance of the wire spiral. The slope of temperature against a special function of time is used to calculate the material’s thermal effusivity. 

Standard TPS-EFF Sensor

The TPS-EFF comes with a standard 30 mm diameter single-sided sensor for testing textiles, fabrics, and solids. The spring-loaded sensor can be used in two testing configurations. The first is with the sample on top of the sensor. The second configuration is the sensor on top of the sample.

When used with a compression stand and environmental chamber, the TPS-EFF can measure the effect of compression, humidity, and temperature on a materials thermal effusivity.


MaterialsTextiles, Fabrics and Solids
Measurement Capabilities1-Dimensional
Thermal Effusivity Range35 to 1700 W√s/m2K
Measurement Time2 and 10 seconds
Temperature Range-10 to 50°C
Moisture Range0 to 90% (non-condensing)
Minimum Sample Size35 mm diameter x thickness dependent on Effusivity
Maximum Sample SizeUnlimited
Stanisław Gołębiewski
Application Engineer
Stanisław Gołębiewski
Application Engineer