Temperature controlled microwave system for heating contents...

Details Temperature controlled microwave system for heating contents... Temperature controlled microwave system for heating contents...

H - Electricity

05

B

H05B 6/68 (2006.01) B01J 19/12 (2006.01) F24C 7/02 (2006.01) H05B 6/80 (2006.01)

Patent

CA 2047049

ABSTRACT OF THE DISCLOSURE: A microwave heating system for controllably heating a material, such as a chemical sample being digested by strong acid in a moving sealed container, such as one of polyfluoroethylene and/or polyether imide, includes a source of microwave radiation, such as a magnetron, which radiation is directed into a microwave chamber, a controller for the source of microwave radiation/ which can increase or decrease the radiation applied depending on a thermoelectric potential transmitted to it from a thermocouple, and such a thermocouple, the hot junction of which is for insertion into the container and into the material being heated to produce a thermoelectric potential which is indicative of the temperature of the contained material, means for transmitting the thermoelectric potential from the thermocouple to the controller and means for preventing straining of the thermocouple due to movement thereof as the container moves, which strain preventing means facili- tates the thermocouple cold junction moving in angular motion corresponding to the motion of the container and the hot junction, and thereby prevents or relieves any straining of the thermocouple that would otherwise be caused by such movements. In other aspects of the invention slip rings are employed, the thermocouple is encased in gold plated shielding, the thermocouple and the shield are of spiral shape, the base of the container and the thermocouple are shielded and a fluoroptic temperature sensor is employed as a temperature check. Also within the invention is a heating process, such as a digestion, in which the invented system is employed.

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