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Thermal Conductivity

Find Thermal Conductivity and Diffusivity

Applications

  • Measure thermal conductivity of soil for agronomic and engineering applications

  • Measure thermal conductivity of foods to optimize cooking or baking times

  • Measure thermal conductivity of insulating materials for use in engineering design

Specifications

  • Accuracy: ± 5%

  • Dimensions: Head is 25 x 13 x 13 mm long, Needle is 60mm x 1.27mm diameter.

  • Temperature Sensor: 10K Precision Thermistor.

  • Material: Epoxy and Delrin head, Stainless steel needle

  • Cable length: 2m standard (additional cable available.)

Theory

The Thermal Conductivity sensor consists of a 60mm long stainless steel needle containing an Evanohm heater and a precision 10K thermistor. The thermal conductivity of a material is determined by inserting the needle in the material, applying current to the heater, and monitoring temperature rise with the thermistor. The thermal conductivity can be calculated from the power input and temperature rise during a 1 to 2 minute heating period.

The East 30 Sensors Thermal Conductivity Sensor is based on the accepted methods and technology for the measurement of thermal conductivity. 

What you need

The East 30 Sensors Thermal Conductivity Sensor is simple. Requiring only a constant current source and high resolution temperature reading, these sensors are easily compatible with Campbell Scientific Data loggers.

In the Package

Thermal Conductivity sensor with needle orientation either horizontal or vertical, whichever fits your project best. Simple and sturdy design helps this sensor to be durable, as well as accurate. Sample programs for data loggers and macros for excel are available upon request to help process data.

Selected Publications

American Society of Agronomy, Method of Soil Analysis, Part 1 Second Edition, Monograph 9, Chapter 39.

Bristow, K.L., R.D. White, and G.J. Kluitenberg (1994). Comparison of Single and Dual Probes for Measuring Soil Thermal Properties with Transient Heating. Australian Journal of Soil Research 32:447-464

Shiozawa and G.S. Campbell, 1990 Remote Sensing Review. Soil Thermal Conductivity: Vol. 5(1) 301-310.

de Vries, D.A. (1963). Thermal Properties of soils. Physics of Plant Environment. (Ed. W. R. Van Wijk.) pp. 210-35 (North-Holland: Amsterdam)

Putkonen, J.K. 1998. Soil Thermal Properties and Heat Transfer Processes near Ny Alesund, northwestern Spitsbergen, Svalbard. Polar Research, Vol. 17 (2), pp.165-179. Norwegian Polar Research Institute.

Putkonen, J. K., Climatic control of the thermal regime of permafrost, northwest Spitsbergen., Ph.D Dissertation thesis, University of Washington, Seattle, 1997

Yun, T., Jeong, Y., Han, T., & Youm, K. 2013. Evaluation of thermal conductivity for thermally insulated concretes. Energy and Buildings, Vol. 61 pp. 125-132. 

Nasirian, A., Cortes, D.D., Dai, S., 2015. The Physical Nature of Thermal Conduction in Dry Granular Media. Geotechnique Letters 5.