Patent ID: 8613545

Claim:
A scan adiabatic resistive calorimeter (SARC) with ohm heating of the sample of the type that beginning with a scan heating of plaster, wet minerals and some food system samples, in adiabatic conditions and in constant pressure is determined the specific heat and the thermal conductivity in said sample, comprising a cylindrical chamber hermetically closed which is formed of an outer and an inner cylinder, in such manner that between the outer and the inner cylinders there forms a chamber which is filled with mineral oil, inside said oil filled chamber there are a resistor connected to a power source to heat the oil and a helix joined to an engine that helps to dissipate the heat given by the resistor in the whole oil chamber, wherein both the temperature in the inner cylinder and that of the oil chamber are continuously monitored by thermopars which are placed inside the inner cylinder and the oil chamber, the cylindrical chamber is also formed by a lower and an upper piston which are placed inside the inner cylinder and those are supplied in the end that is in contact with the sample with electrodes connected to two resistors, these resistors are fed by independent power sources, and placing in the inner part of both electrodes thermopars which monitor their temperature, in such way that there forms a free space within the inner cylinder which is monitored by thermopars and between the upper and lower pistons the sample can be placed and connected through the electrodes to a power source and a signal generator, the calorimeter is also composed by a section of actuators which is formed of the power sources connected to the resistors in the oil chamber, the upper piston, the lower piston and the sample, as well as an oscilloscope and the signal generator; and finally the controlling system which manipulates a set of control objects respecting a set of controlled variables' state which is composed by a personal computer, a GPIB phase COM link card, amplifiers and a data reception card, all connected among themselves and with the actuators and the elements that compose the cylindrical chamber hermetically closed.