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Versatile measurement platform with accurate methods for thermal conductivity, thermal diffusivity, specific heat and thermal effusivity of solids, liquids, pastes and powders.
Transient methods share similar theory with differences that are specific to their primary design.
The sensors are electrically connected to a power supply and sensing circuit. A current passes through the sensors and creates an increase in temperature, which is recorded over time. The heat generated is then diffused into the sample at a rate dependent on the thermal transport characteristics of the material.
Intelligent transient design for automation of testing and analysis. Raw data is always available to empower understanding of your results. Name your sample, iTransient does the rest.
The TPS sensor designed for solids, pastes, and powders is comprised of a double-spiral of nickel encapsulated between layers of insulation (Kapton). Standard operation of this sensor (two-sided) is placed between two pieces of the same sample.
Our proprietary TPS calculation model measures the contact resistance between the sensor and sample, as well as the thermal conductivity, thermal diffusivity, volumetric specific heat, and thermal effusivity of the sample.
The THW sensor designed for liquids and phase change materials (PCMs) consists of a replaceable thin heating wire secured to a specially designed sensor and sample cell.
This allows back pressurizing liquids to measure thermal conductivity, thermal diffusivity, and volumetric specific heat past boiling
temperatures. Measurements are done at short test times (1 second) to limit convective effects on samples with a wide range of viscosities.
The MTPS sensor follows the same principles of operation as TPS. The sensor is configured for asymmetric (single-sided) testing, ideal when only one piece of sample is available. Included testing modules are bulk, anisotropic, slab and 1-D for full characterization of diverse materials.
The TLS sensor designed for soil, pastes, and polymers. The sensor is completely inserted into the sample to be tested. Heat is delivered to the sample using a constant current source and the temperature rise is recorded over a defined period of time.
The slope from the plot of temperature rise versus logarithm of adjusted time is used in the calculation of thermal conductivity.
Isolated out-of-plane thermal conductivity, thermal diffusivity, and volumetric specific heat for short and tall elongated shapes, rods, and bars. Asymmetric.
Methods | TPS | THW | MTPS | TLS |
|---|---|---|---|---|
Materials | Solids, pastes and powders | Liquids and PCMs | Solids, pastes and powders | Soil, pastes, and polymers |
Testing modules | 3-D: Bulk, Anisotropic, Slab, Thin-Film. General: Specific Heat | Bulk | 3-D: Bulk, Anisotropic, Slab. 1-D: Standard, 1-D Slab | Bulk |
Thermal conductivity (W/m·K) | 0.01 to 500 | 0.01 to 2 | 0.03 to 500 | 0.1 to 8 |
Thermal diffusivity (mm²/s) | 0.01 to 300 | Up to 0.5 | 0.01 to 300 | N/A |
Specific heat (J/kg-K) | Up to 5 | Up to 5 | Up to 5 | N/A |
Thermal effusivity (W√s/m²K) | 20 to 40000 | N/A | 20 to 40000 | N/A |
Sample size (mm | mL)* | 10 diameter or square | 20 mL | 25 diameter or square | 50 diameter |
Sample thickness (mm)* | 0.05 | N/A | 0.1 | 100 length |
Largest sample size (mm) | Unlimited | Unlimited | Unlimited | Unlimited |
Test time (seconds) | 2 to 160 | 1 | 2 to 160 | 180 |
Accuracy (Thermal conductivity) | 5% | 2% | 5% | 5% |
Repeatability (Thermal conductivity) | 2% | 1% | 2% | 2% |
Temperature range (°C)** | 0 to 300 -75 to 300 | -50 to 200 | 0 to 100 | -50 to 200 | -40 to 100 |
Sample configuration | Symmetric (Two-Sided) | Asymmetric (Single-Sided) | Inserted | Asymmetric (Single-Sided) | Inserted |
Standard | ISO 22007-2:2022, ISO 22007-7:2023, GB/T 32064-2015 | ASTM D7896-19 | ISO 22007-7:2023 | ASTM D5334-22a, ASTM D5930-17, IEEE 442-2017 |
* Based on testing module used.
** For temperature, external control required.
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