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.
Specification:
| Materials | Textiles, Fabrics and Solids |
| Measurement Capabilities | 1-Dimensional |
| Thermal Effusivity Range | 35 to 1700 W√s/m2K |
| Measurement Time | 2 and 10 seconds |
| Reproducibility | 2% |
| Accuracy | 5% |
| Temperature Range | -10 to 50°C |
| Moisture Range | 0 to 90% (non-condensing) |
| Minimum Sample Size | 35 mm diameter x thickness dependent on Effusivity |
| Maximum Sample Size | Unlimited |
