Importance

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Abstract

A heating element having a pair of terminals for being coupled to a source of electric current. The heating element includes a path arranged in a field having outer path elements and inner path elements. The outer path elements are in the form of at least one row of a repeated alternating wave of a first predetermined amplitude and pitch. The row substantially surrounding the perimeter of the field and the inner path elements is primarily in the form of a repeated alternating wave of a second predetermined amplitude and pitch. The second amplitude is substantially greater than that of the first amplitude and the second pitch is less than the first pitch. A sample heating device includes a base, four side walls extending from the base and a sample holding plate for holding sample vials. The sample holding plate, the base, and the side walls define a chamber. The sample vials are positioned within the chamber. The device also includes a first heating device for heating the chamber and the sample vials positioned therein. A temperature cycling apparatus includes a sample heating device as discussed above, and the sample heating device. The base of the sample heating device is positioned over the first fan and the first fan blows air toward the heating device.

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First Claim