TLS-100 Transient Line Source

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.

Best for soil, rock, concrete, and polymers
Thermtest TLS-100 portable meter for solids
A transient line source instrument, the TLS-100 portable meter is used to measure thermal conductivity and thermal resistivity, both in the field and in the laboratory. Designed for testing the thermal conductivity and thermal resistivity of soil, rock, concrete, and polymers. Tests can be performed with the push of a button and results are displayed immediately.

Features

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 displayed instantly. The second generation TLS-100 has many advancements, such as sensors which are auto-recognized, with corresponding testing parameters automatically loaded.

The Transient Line Source (TLS) meter follows ASTM D5334-14 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.

TLS-100 equation

Specification

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.

Reproducibility

± 2%

Accuracy

± 5%

Temperature Range

-40 to 100°C

Largest Sample Size

Unlimited

Standard

100 mm: ASTM D5334-14, and IEEE 442-1981;

150mm: ASTM D5334-14, IEEE 442-1981, and IEEE 442-2017

Testing Sensors

Standard 100 mm Sensor

Standard 100 mm Sensor

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.

Soil thermal Dryout Curves can be prepared by measuring the thermal conductivity of a sample at different moisture contents, as the sample dries from saturation. The typical drying approach involves heating the soil at an elevated temperature. The sample is removed, weighed, and measured for thermal conductivity at different time intervals, until it is fully dried.

Materials

Soils, Pastes, Powders, and Solids

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.

Reproducibility

± 2%

Accuracy

± 5%

Temperature Range

-40 to 100°C

Minimum Sample Size

100 mm in length, 50 mm diameter

Largest Sample Size

Unlimited

Standard

ASTM D5334-14, IEEE 442-1981

TLS-100 with 50mm

Standard 50 mm Sensor

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.

Materials

Concrete, Rock, and Polymers

Measurement Capabilities

Bulk Properties

Thermal Conductivity

0.3 to 5 W/m•K

Thermal Resistivity

0.2 to 3.3 m•K/W

Measurement Time

3 min.

Reproducibility

± 2%

Accuracy

± 5%

Temperature Range

-40 to 100°C

Minimum Sample Size

50 mm in length, 50 mm diameter

Largest Sample Size

Unlimited

Standard

Modified ASTM D5334-14

TLS-100 with 150mm

Optional 150 mm Sensor

Optional 150 mm sensor 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.

Materials

Soils, Pastes, Powders, and Solids

Measurement Capabilities

Bulk Properties

Thermal Conductivity

0.1 to 3 W/m•K

Thermal Resistivity

0.3 to 10 m•K/W

Measurement Time

3 min.

Reproducibility

± 2%

Accuracy

± 5%

Temperature Range

-40 to 100°C

Minimum Sample Size

150 mm in length, 50 mm diameter

Largest Sample Size

Unlimited

Standard

ASTM D5334-14, IEEE 442-2017

Standard 100mm – vCp Sensor

Standard 100mm – vCp Sensor

The TLS 100 mm – vCp Sensor was designed for testing the thermal conductivity, thermal diffusivity, and specific heat of soil, soft or easy to drill materials.

Materials

Soils, Pastes, Powders, and Solids

Measurement Capabilities

Bulk Properties

Thermal Conductivity

0.1 to 5 W/m•K

Reproducibility

± 2%

Accuracy

±5%

Thermal Diffusivity

0.05 to 1.5 mm²/s

Accuracy

± 10%

Volumetric Specific Heat

Up to 2.5 MJ/m³K

Accuracy

± 15%

Temperature Range

-40 to 100°C

Minimum Sample Size

100 mm in length, 50 mm diameter

Largest Sample Size

Unlimited

Standard

ASTM D5334-14

Customer Reviews

The TLS -100 instrument from Thermtest that we purchased has been effective and reliable for measuring the thermal conductivity of the samples in our concrete laboratory. Daniel from Thermtest has been extremely helpful right from the beginning when we considered purchasing this instrument until today with his advice and technical support. He answered all the queries that I had about the instrument and the measurement technique even prior to the purchase. All in all, I am very happy that we chose Thermtest and thank them for providing us with their excellent customer service.

— Ruchita Jani, Postgraduate Researcher at TU Dublin

We purchased the TLS-100 last year and it has been already become an invaluable part of our R&D process. The TLS-100 is very user friendly and gives us repeatable results which gives us confidence. The Thermtest customer service has been great too. Thanks!

— Johan du Plessis, CEO at Tepeo

The TLS-100 device is used in our laboratory for the testing of soil samples. The aim of the measurement is to test the soils as backfill material for high voltage power cables. In our measurements we test the soil at different water contents. Compared to devices from other manufacturers, the TLS-100 is a reliable and precise measuring device. A special advantage is the short measuring time and an excellent customer service.

— Dr.-Ing. Steffen Trinks, Pedotec GmbH Berlin

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