Irradiation device having transition glass seal

An irradiation device comprising a housing (5) having an interior chamber and an infrared emitter (1;

• 27) arranged therein, the emitter having an emitter tube (2) made of a high silica content glass, having a circular cross section and defined outer diameter, and having a linear or coil-shaped heating filament (3) arranged therein, the filament being provided with electrical connection elements (4) made of a metallic material, the connection elements being guided out from the emitter tube (2) through a seal (13), the emitter tube having two ends, at least one of which ends (8;
• 28) extends into an outer space separated in a fluid-tight way from the interior chamber by a sealing element (11;
• 31) contacting the emitter tube (2) on the outside, wherein the at least one emitter tube end (8;
• 28) also has a circular cross section and the defined outer diameter, and wherein a seal (13) is provided between the electrical connection element (4) and the emitter tube (2), the seal comprising at least one transition glass having a thermal expansion coefficient lying between respective thermal expansion coefficients of the metallic material and the high silica content glass.