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.
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 are performed with the push of a button and results are displayed instantly. The TLS-100 features sensors that are auto-recognized with corresponding testing parameters automatically loaded.
The TLS-100 follows ASTM D5334-22a and IEEE 442-2017. The sensor needle consists of a thin heating wire and temperature sensor sealed in a 150, 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.
Method | TLS-100 (Included) | TLS-50 | TLS-150 | TLS-100 vCp |
|---|---|---|---|---|
Materials | Soils, pastes, powders and solids | Concrete, rocks and polymers | Soils, pastes, powders and solids | Soil, solids, pastes, and powders |
Thermal conductivity (W/m·K) | 0.1 to 5 | 0.3 to 5 | 0.1 to 3 | N/A |
Thermal resistivity (mK/W) | 0.2 to 10 | 0.2 to 3.3 | 0.3 to 10 | N/A |
Volumetric specific heat (MJ/m³K) | N/A | N/A | N/A | Up to 2.5 |
Smallest sample size (mm) | 100 length, 50 diameter | 50 length, 50 diameter | 150 length, 50 diameter | 100 length, 50 diameter |
Largest sample size (mm) | Unlimited | Unlimited | Unlimited | Unlimited |
Test time (minutes) | 3 | 3 | 3 | N/A |
Accuracy (Thermal conductivity) | 5% | 5% | 5% | 15%* |
Repeatability (Thermal conductivity) | 2% | 2% | 2% | 2% |
Temperature range (°C) | -40 to 100 | -40 to 100 | -40 to 100 | -40 to 100 |
Standard | ASTM D5334-22a, IEEE 442-1981 | N/A | ASTM D5334-14, IEEE 442-2017 | N/A |
*Specific heat
Each TLS-100 comes equipped with the standard 100 mm sensor for testing of soil, soft materials, polymers, and easy to drill materials. The needle sensor is fully inserted into an isothermal sample and a measurement is made with the push of a button. After 180 seconds, results are displayed for thermal conductivity and thermal resistivity. Saved results can also be exported to a computer, via convenient utility software and USB connection.
The 50 mm sensor was designed for testing hard samples like rock and concrete. Drilling the required 4 mm diameter x 50 mm hole in rigid samples is easy with the provided masonry drill bit. When testing hard samples, a thermal contact grease is used to enhance contact between the sensor and sample.
The optional 150 mm sensor is used for in-lab and in-field testing of soil and soft materials according to IEEE 442-2017. The needle is fully inserted into an isothermal sample and measurement is made with the push of a button. After 180 seconds, results are displayed for thermal conductivity and thermal resistivity.
— Ruchita Jani, Postgraduate Researcher at TU Dublin
— Johan du Plessis, CEO at Tepeo
— Dr.-Ing. Steffen Trinks, Pedotec GmbH Berlin
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