A Product by Sylab Instruments
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tls 100

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)
ReproducibilityTypically better than 2%
AccuracyTypically 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
StandardsASTM D5334-14, & IEEE 442-1981
Resources