TPS-EFFusivity Meter
A portable Thermal Effusivity Meter for the Measurement of Textiles, Fabrics, and Solids. TPS-EFF uses a single-sided TPS sensor along with 2 and 10 second test times to fully understand measurement of comfort with touch time.
ASTM D7984-16
FEATURED TRANSIENT PLANE SOURCE CAPABILITIES
Thermal Effusivity (W√s/m2K) is described as a materials ability to exchange heat with its surroundings. Surface haptics is a branch of psychology, describing the sense of touch, localized to the skin surface. The feeling of warmth and coolness (thermal effusivity) makes up the feeling of comfort, or the desired effect, which goes into the touched material surface. This is an important field of measurement for textiles, fabrics and solids.
The TPS-EFF (Transient Plane Source-EFFusivity) is a portable meter for direct determination of thermal effusivity of textiles and other low effusivity materials, in accordance with ASTM D7984-16. With a single measurement of 2 or 10 seconds in duration, materials can be accurately measured for thermal effusivity.
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 thermal effusivity of the material. For materials of relatively high effusivity, the slope will be lower, than materials of low effusivity.
Mathematically, thermal effusivity equates to the square root of the product of thermal conductivity (W/m•K), Density (kg/m3) and Heat Capacity (J/kg•K). For certain materials, like textiles, there are often other modes of heat transfer, such as convection and radiation. These modes of heat transfer alter the thermal conductIVITY to thermal conductANCE. The resulting term used for measurement of materials like this is referred to as Thermal Effusance.
- Follows International Standard ASTM D7984-16
- Portable, Economical, and Accurate
- Easy to use
- Test time 2 and 10 seconds
- No user calibrations required
TPS-EFFusivity METER SPECIFICATIONS
| 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 Range1 | -10 to 50°C |
| Minimum Sample Size | 35 mm diameter x thickness dependent on Effusivity |
| Maximum Sample Size | Unlimited |
| Moisture Range | 0 to 90% (non-condensing) |
| Sensor Diameter | 30 mm |
| Standards | ASTM D7984-16 |
| Test Method | Transient Plane Source (TPS) |