KD2 Pro Thermal Properties Analyzer
The KD2 Pro is a fully portable field and lab thermal properties analyzer. It uses the transient line heat source method to measure thermal conductivity, thermal resistivity, thermal diffusivity, and specific heat. Sophisticated data analysis is based on 30+ years of research experience on heat and mass transfer in soils and other porous materials.
The compact KD2 Pro controller is much more than a simple readout for time and temperature. A proprietary algorithm fits time and temperature data with exponential integral functions using a nonlinear least squares method. This fully mathematical solution delivers thermal conductivity/resistivity to within ±10%.
Corrects for Temperature Drift
Temperature changes of a thousandth of a degree per second--the sun warming the soil, for example, or someone walking into the lab-- destroy the accuracy of thermal properties calculations. Unlike other thermal needle systems, the KD2 Pro corrects for linear temperature drift that can cause large errors.