Transient Plane Source

Transient Plane Source

The Hot Disk TPS 2500 S is a transient plane source thermal constants analyzer used to measure thermal conductivity, thermal diffusivity, and volumetric specific heat of various sample types. It conforms to ISO Standard 22007-2.

Transient Plane Source

The instrument uses a probe that consists of a double-spiral of Nickel (radius 0.5 to 30 mm) sandwiched between two layers Kapton less than 0.025 mm thick. The probe is typically immersed in or placed between two pieces of the sample to be measured. To measure the thermal properties of the sample, a current passes through the Nickel, and the resulting heat is dissipated through the sample. Simultaneously, the change in temperature of the probe is measured throughout the test. The resulting transient temperature profile is used for the Hot Disk software to calculate the thermal properties of the sample.

The Hot Disk probe is ported inside a Tenney Jr. environmental chamber, which allows measurement over a temperature range of -50 °C to 200 °C. With proper selection of test parameters, samples with thermal conductivities as low as 0.005 W/m-K or as high as 500 W/m-K can be measured accurately (manufacturer specification). Samples in solid, liquid, and powder form can be tested with included or custom sample holders. The smallest sample that may be tested with available sensors is 8 mm diameter by 4 mm thick (on each side of the sensor). Smaller sensors may be purchased that enable testing of samples as small as 2 mm diameter by 1 mm thick.

Application Examples:

B Adl-Zarrabi: Oskarshamn Site Investigation: Borehole KLX16A: Thermal Properties of Rocks Using TPS Method. Report P-07-144 (29 pp.) authored by the SP Technical Research Institute of Sweden on behalf of the Swedish Nuclear Fuel and Waste management Co, 2007.

M Gustavsson, H Nagai and T Okutani: Characterization of anisotropic and irregularly-shaped materials by high-sensitive thermal conductivity measurements. Solid State Phenomena Vols. 124-126, 1641-1644 (2007)