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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 mid-range MP-V includes two primary test methods for thermal conductivity, thermal diffusivity, specific heat and thermal effusivity. Conforming to international standards, the transient plane source (TPS) and transient hot wire (THW) are designed specifically for their primary applications. As MP-V methods are absolute, the thermophysical results are calculated from the raw-data, with no need for contact agents or calibration.
The TPS (double spiral) sensor is placed between two pieces of the same sample. As the sample acts as a semi-infinite body, thermophysical properties are measured over a range of optional test times (2 to 160 seconds), which are auto-determined by the iTPS algorithm. The range of available sensor diameters allows sample size flexibility. Additional testing modules available include anisotropic, thin-films and specific heat.
The THW sensor is inserted into the liquid sample cell. The small diameter sensor wire and short test time are designed to reduce effects of convection. The THW method is well-published for testing liquids with accurate and reliable results.
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 consists of a thin heating wire and temperature sensor sealed in a steel tube. The sensor is completely inserted into the sample to be tested.
The THW-L sensor is specifically designed for use with temperature and pressure for testing liquids past their boiling points. The test cell can be back pressured (up to 20 bar) to keep liquid in stable state.
Methods | TPS | THW | MTPS | TLS | THW-L |
|---|---|---|---|---|---|
Materials | Solids, pastes and powders | Liquids | Solids, pastes and powders | Soil and polymers | Liquids and PCMs |
Thermal conductivity (W/m·K) | 0.01 to 100 / 500 | 0.01 to 2 | 0.03 to 100 / 500 | 0.1 to 8 | 0.01 to 2 |
Thermal diffusivity (mm²/s) | 0.01 to 50 / 300 | Up to 0.5 | 0.01 to 50 / 300 | N/A | Up to 0.5 |
Specific heat (J/kg-K) | Up to 5 | Up to 5 | Up to 5 | N/A | Up to 5 |
Thermal effusivity (W√s/m²K) | 20 to 20000 / 40000 | N/A | 20 to 20000 / 40000 | N/A | N/A |
Temperature (°C)* | Room temperature or -75 to 300 | Room temperature or -50 to 100 | -50 to 200 | -40 to 100 | 0 to 100 |
Accuracy | 5% | 2% | 5% | 5% | 2% |
Repeatability | 1 to 2% | 1% | 2% | 2% | 1% |
Smallest dimension** | 10mm x 10mm to unlimited | 20 ml | 25mm x 25mm to unlimited | 50mm to unlimited | 20 ml |
Sample thickness (mm)** | 0.05 to unlimited | N/A | 0.1 to unlimited | 100 to unlimited | N/A |
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 | ASTM D7896-19 |
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