Heating device for an atomic absorption spectrometer

Abstract

In a heating device for atomic absorption spectrometers with electrothermal excitation of a sample, a tubular body for receiving the sample comprises a radial aperture (15) for introducing the sample at the central part of the tubular body. A pair of contacts (1, 2) can be cooled comprise current supplies (3), each consisting of a detachable upper part (5) and a fixed lower part (6) with the upper part and the lower part being connected together so as to be detachable. Each contact comprises an aperture (9) which is coaxial with the tubular body with the apertures extending partly in the upper part and partly in the lower part of the contacts and holding the ends of the tubular body. Damage and deformations of the contacts are avoided in that the diameters of the apertures (9), with the upper parts (5) laid flush on the lower parts (6), are shorter in the vertical direction than in the horizontal direction. The upper parts (5) of the apertures (9) each have a groove (12) which points upwards and extends parallel to the longitudinal axis of the apertures (9). On each end of the tubular bodies (11) a resilient clamping ring (10) is slid whose inside diameter is smaller than the outside diameter of the tubular body (11) and whose outside diameter corresponds to the apertures of the contacts (1, 2). The clamping ring comprises a vertical slot (13) at the area of the lower part (6). Alternatively instead of the clamping rings the ends of the tubular body (11) optionally comprise flanges (14) at its end and are surrounded by graphite foil.