The Transient Hot-Wire (THW-L2) is widely used for the accurate measurement of thermal conductivity for liquids and pastes.
Best For Liquids and Pastes
The Transient Hot Wire (THW-L2) Liquid Thermal Conductivity Meter is an advanced measurement system for direct determination of the thermal conductivity of liquids and pastes in accordance with ASTM D7896-19. The THW-L2 was designed with speed and operational simplicity in mind. With a single measurement of less than 2 seconds in duration, small volumes of liquids and pastes can be accurately and precisely measured for thermal conductivity. The THW-L2 utilizes a non-stationary measurement approach and rapid test times to limit convective effects for samples with a wide range of viscosities.
| Materials | Liquids & Pastes |
| Measurement Capabilities | Bulk Properties |
| Thermal Conductivity | 0.01 to 2 W/m•K |
| Measurement Time | < 2 seconds |
| Reproducibility | Typically better than 2% |
| Accuracy | Typically better than 5% |
| Temperature Range 1 | -50 to 100°C |
| Pressure | Ambient |
| Smallest Volume | 15 ml |
| Largest Sample Size | Unlimited |
| Standards | ASTM D7896-19 |
The THW-L2 comes with the standard 60 mm sensor for the testing of liquids and pastes. The sensor is fully inserted into an isothermal sample, and measurements are made with the push of a button. In less than 2 seconds, results are displayed for thermal conductivity. Sample volumes as small as 15 ml can be tested. The easy to use THW software enables measurements to be controlled via a computer. When used in conjunction with the optional thermoelectric dry bath, the software can even automate thermal conductivity measurements with temperature.
The THW-L2 is capable of testing low thermal conductivity compressible insulations without the liquid sample holder. Samples with minimum dimensions of 65 mm in length and 2 mm in thickness can be tested in a horizontal configuration, with the sensor sandwiched between the samples. Expanded polystyrene was measured with the THW-L2 and given a result of 0.031 W/m•K, which is within 5% of the literature values.
Liquid samples of unlimited size can be tested with the THW-L2. With the small volume cell insert, volumes as low as 15 mL can be measured. The instrument’s ability to control convection, using short test times, allows accurate measurements of a wide range of samples with varying viscosities.
Approximate Time: 1 minute
Once the liquid has been poured into the sample holder, the sensor can be vertically inserted in place. For smaller sample volumes, position the small volume cell into the sample holder, prior to the addition of the sample and sensor.
Approximate Time: < 1 minute
The instrument can be controlled through the front panel with the push of a button, or Windows-based computer software. Single temperature point measurements, as well as scheduled temperature intervals, may be performed using the easy to use THW software.
Approximate Time: < 1 minute
Using the Windows-based software, users can save, print, and export test results to Microsoft Excel, for further processing once testing is complete.
Approximate Time: 1 minute
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To cast PCM samples for the THW-L2.
Used for testing samples from -10 to 100 °C.
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December 8, 2021
Sofia Mylona
Mitchell Robinson
Brochure
