Thermtest TLS-100

Portable Thermal Conductivity Meter

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.

TLS-100 Specification

MaterialsSoil, Rock, Concrete, & Polymers
Measurement CapabilitiesBulk Properties
Thermal Conductivity0.1 to 5 W/m•K
Thermal Resistivity0.2 to 10 m•K/W
Measurement Time3 min.
Reproducibility2%
Accuracy5%
Temperature Range-40°C to 100°C
Largest Sample SizeUnlimited
Standards100 mm: ASTM D5334-14, and IEEE 442-1981;
150mm: ASTM D5334-14, IEEE 442-1981, and IEEE 442-2017

TLS-100 Highlights

Standard 100 mm Sensor

Standard 100 mm Sensor

Soil Thermal Conductivity Testing

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
Standards ASTM D5334-14, IEEE 442-1981
Thermtest TLS 50mm sensor

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 5 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
Standards ASTM D5334-14
Thermtest TLS 150mm sensor

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
Standards ASTM D5334-14, IEEE 442-2017
TLS-100mm vCp sensor

Standard 100 mm - vCp Sensor

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
Standards ASTM D5334-14

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