The TLS-100 is a portable meter used to measure thermal conductivity and thermal resistivity of a variety of samples, including soil, rocks, concrete, and polymers. Tests can be performed with the push of a button and results are displayed instantly.
The Transient Line Source (TLS) meter follows ASTM D5334-14. The sensor needle consists of a thin heating wire and temperature sensor sealed in a 100 or 50 mm steel tube. The sensor is completely inserted into the sample to be tested. Heat is delivered to the sample using a constant current source (q) and the temperature rise is recorded over a defined period of time. The slope (a) from plot of temperature rise versus logarithm of time is used in the calculation of thermal conductivity (k). The higher the thermal conductivity of a sample, the lower the slope. For samples of low thermal conductivity, the slope will be higher.
|Materials||Soil, Rock, Concrete, & Polymers|
|Measurement Capabilities||Bulk Properties|
|Thermal Conductivity||0.1 to 5 W/m•K|
|Thermal Resistivity||0.2 to 10 m•K/W|
|Measurement Time||3 min. (100mm) / 5 min. (50mm)|
|Reproducibility||Typically better than 2%|
|Accuracy||Typically better than 5%|
|Temperature Range||-40 to 100°C|
|Smallest Sample (100 mm)||50 mm (diameter or square) x 100 mm|
|Smallest Sample (50 mm)||50 mm (diameter or square) x 50 mm|
|Largest Sample Size||Unlimited|
|Standards||ASTM D5334-14, & IEEE 442-1981|