THW-L2 Fil chaud transitoire

The Transient Hot-Wire (THW-L2) is widely used for the accurate measurement of thermal conductivity for liquids and pastes.

Idéal pour liquids and pastes
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    THW-L2

    The Transient Hot Wire (THW-L2) Liquid Thermal Conductivity Meter is a portable measurement system for direct determination of the thermal conductivity of liquids and pastes. The THW-L2 follows international standard ASTM D7896-19, and was designed with speed and operational simplicity in mind.

    Caractéristiques

    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. 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 (m) from the plot of temperature rise vs. logarithm of time is used in the calculation of thermal conductivity (λ). For liquid samples of high thermal conductivity, the lower the slope. For liquid samples of low thermal conductivity, the higher the slope.

    THW equation
    • Follows international standard: ASTM D7896-19
    • Portable, Economical, & Accurate
    • Results without the effects of convection
    • Easy to use
    • Optional thermoelectric dry bath for automated temperature testing

    Specification

    Matériaux

    Liquids & Pastes

    Capacités de mesure

    Propriétés de masse

    Conductivité thermique

    De 0,01 à 2 W/m•K

    Temps de mesure

    < 2 seconds

    Reproductibilité

    Typically better than 2%

    Précision

    Typically better than 5%

    Temperature Range*

    -50 to 100°C

    Pression

    Ambiante

    Smallest Volume

    15 ml

    La plus grande taille d'échantillon

    Illimité

    Standard

    ASTM D7896-19

    * Requires cooling/heating apparatus.

    Testing Sensor & Applications

    THW-L2 Sensor

    Standard THW-L2 Sensor

    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.
    Thermal Conductivity of Nanofluids

    Thermal Conductivity of Nanofluids

    The THW-L2 is capable of testing the thermal conductivity of almost any kind of liquid including nanofluids, nanopowders, emulsions, and pastes using the same sensor and measuring cell. The sensitivity of the sensor can record even the smallest thermal conductivity changes when solid particles are settling inside a liquid mixture.
    Dry Bath

    Optional Dry Bath

    The optional dry bath allows for automated measurements of thermal conductivity with temperature (-10 to 90°C or 0 to 100°C). 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 temperature ranges, additional cooling/heating options are available.

    Liquids vs. Temperature

    THW Graph

    Using the Thermoelectric Dry Bath, the Thermtest THW-L2 is capable of testing liquids over a wide temperature range. In this  application, deionized ultra-filtered (DIUF) water was tested from 10 to 70 °C, using the THW-L2. All test results were within 5% of the literature values.

    Measurement Process

    THW sample

    The Sample

    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 min.
    THW-L2 insert sensor

    Insert Sensor

    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 min.

    THW-L2 run experiment

    Run Experiment

    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 min.

    THW-L2 Export results

    Exporting Results

    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 min.

    Comparaison des modèles de fil chaud transitoire (THW)


    mp-1 thw

    THW-L1

    thw-l2

    Modèles

    MP-1 avec THW

    THW-L1

    THW-L2

    MP-2 avec THW-L3

    Matériaux

    Pâtes, Liquides et Poudres

    Pâtes, Liquides et Poudres

    Pâtes, Liquides et Poudres

    Pâtes, Liquides et Poudres

    Modules d'essai

    En masse

    En masse

    En masse

    En masse

    Autres matériaux

    Solides avec TPS

    Non

    Non

    Solides avec TPS, TLS

    Conductivité thermique

    De 0,01 à 2 W/m•K

    De 0,01 à 2 W/m•K

    De 0,01 à 2 W/m•K

    De 0,01 à 1 W/m•K

    Taille de l'échantillon

    20 mL

    20 mL

    15 mL

    15 mL

    Propriétés supplémentaires

    Diffusivité thermique et Chaleur spécifique

    Diffusivité thermique et Chaleur spécifique

    Non

    Non

    Plage de Température

    Température ambiante de

    10 à 200 °C | -50/-15/0 à 200 °C

    -160/-45/-15/0 à 300 °C

    10 à 200 °C | -50/-15/0 à 200 °C

    -160/-45/-15/0 à 300 °C

    -50 à 100 °C

    Température ambiante de

    10 à 40°C

    Pression

    Jusqu’ à 35 bar

    Jusqu’ à 35 bar

    Ambiante

    Ambiante

    Temps d'essai

    1 seconde

    1 seconde

    1 seconde | < 5 secondes

    1 seconde

    Points de données

    400 Points de données

    100 Points de données

    60 Points de données

    60 Points de données

    Précision

    2 %

    2 %

    5 %

    5 %

    Répétabilité

    1 %

    1 %

    2 %

    2 %

    Normes

    ASTM D7896-19

    ASTM D7896-19

    ASTM D7896-19

    ASTM D7896-19

    Appareil de refroidissement externe requis

    Non | Oui*

    Non | Oui*

    Oui

    Oui

    *Dépendant du modèle utilisé

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