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Featured TRANSIENT HOT WIRE Capabilities
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. 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. The THW sensor consists of a thin heating wire 60 mm in length and is completely inserted into the sample to be tested. The sensor wire is heated using a constant current source (q) and the temperature rise is recorded by monitoring the change in electrical resistance of the wire. The slope (a) from the plot of temperature rise vs. logarithm of time is used in the calculation of thermal conductivity (k). For liquid samples of high thermal conductivity, the lower the slope. For liquid samples of low thermal conductivity, the higher the slope.
|Materials||Liquids & Pastes|
|Measurement Capabilities||Bulk Properties|
|Thermal Conductivity||0.01 to 2 W/mK|
|Measurement Time||< 2 seconds|
|Reproducibility||Typically better than 2%|
|Accuracy||Typically better than 5%|
|Temperature Range 1||-50 to 100°C|
|Smallest Volume||15 ml|
|Largest Sample Size||Unlimited|
1 Requires cooling/heating apparatus.
Portable. Economical. Accurate.
The THW-L2 comes with the standard 60 mm sensor for 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. Volumes as small as 15 ml can be tested. Measurements can also be controlled by a computer with the easy to use THW software.
Using the included THW-L2 software and optional dry bath, automated measurements of thermal conductivity with temperature (-10 to 90°C or 0 to 100°C) have never been more convenient. The THW software automatically controls the increments of temperature steps between the desired start and end temperatures to ensure isothermal conditions and test results are free of temperature drift effects. For wider ranges of temperature, additional cooling/heating options are available.
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Find a variety of recorded, live and one-on-one by request product demonstrations, webinars, and additional interesting technical videos. Request a free demonstration to see how a thermal conductivity measurement or thermal resistance test is completed.