Thermal conductivity probe

​Thermal conductivity measurements using non-steady-state-probe (NSSP) according to ASTM D 5334-00 and D 5930-97 standards. A 2.5 mm diameter hole is drilled at the center of cylindrical rock sample with a diameter of 68 mm a height of 48 mm. A 1.2 mm diameter thermo-resistance needle is used as both heating wire and as a temperature sensor at the source.