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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

ASTM D5334-14 | IEEE 442-2017

Standard Test
Method

-40°C To 100°C

Temperature
Range

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.

transient hot wire equation

  • 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

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
Standards 50 mm: ASTM D5334-14; 100 mm: ASTM D5334-14, and IEEE 442-1981; 100mm vCp: ASTM D5334-14;
150mm: ASTM D5334-14, IEEE 442-1981, and IEEE 442-2017

Testing Sensors

TLS 100 mm Needle Probe
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 50 mm 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
TLS 150 mm 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 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 0.02 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 3.5 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

Applications

Thermal Conductivity of Ceramics
Thermal Conductivity of Ceramics

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

Thermal Conductivity of Soil
Thermal Conductivity of Soil

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

Thermal Conductivity of Snow
Thermal Conductivity of Snow

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

TLS-100 ACCESSORIES

rock testing kit

Rock Needle Kit

Recommended for use when testing solids such as rocks, concrete, or polymers.

 

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