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Thermtest TLS-100

Measures the thermal conductivity and thermal resistivity of samples with transient line source method. A Portable thermal conductivity meter for testing soil, rock, concrete, and polymers.

ASTM D5334-14 • IEEE 442-2017

TLS-100 Thermal Conductivity Meter

Featured TRANSIENT LINE SOURCE Capabilities

  • Thermal conductivity testing equipment for concrete, polymers, soil and soft rock.
  • Follows international standards: ASTM D5334-14, & IEEE 442-2017
  • Portable, Economical, and Accurate
  • Easy to use
  • Standard 100 mm / 150 mm sensor for soft materials
  • Standard 50 mm sensor for hard materials

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 thermal conductivity Equation and Graph
  • Thermal conductivity testing equipment for concrete, polymers, soil and soft rock.
  • Follows international standards: ASTM D5334, & IEEE 442-2017
  • Portable, Economical, and Accurate
  • Easy to use
  • Standard 100 mm / 150 mm sensor for soft materials
  • Optional 50 mm sensor for hard materials

TLS-100
Portable Thermal Conductivity Meter
SPECIFICATIONS

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
Standards 100 mm: ASTM D5334-14, and IEEE 442-1981; 150mm: ASTM D5334-14, IEEE 442-1981, and IEEE 442-2017

TLS-100 Thermal Conductivity Meter Sensor Options

TLS Standard 100mm 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
Standards ASTM D5334-14, IEEE 442-1981
TLS Standard 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
Standard 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 100 mm - vCpvCp

Standard TLS 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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    Applications using the TLS-100

     Thermal Conductivity Applications Ceramics

    Thermal Conductivity of Ceramics

    Discovering the heat resistant and insulative nature of ceramics, through thermal conductivity testing.

     Thermal Conductivity Applications Snow

    Thermal Conductivity of Snow

    A look into the effect of compaction on the thermal conductivity of snow.

     Thermal Conductivity Applications

    Thermal Conductivity of Soil

    Evaluating the thermal conductivity of varying soil moisture for applications in construction and agriculture fields.

    Download TLS-100 Brochure