The ADICOS HTL-2 is a mobile device for functional testing of all infrared fire detectors of the HOTSPOT product series. The mobile device for functional testing of all HOTSPOT type infrared fire detectors consists of a robust polystyrene housing with an integrated heating plate, which is regulated to a temperature of 100 °C during operation. This leads to an uniform and clearly visible infrared radiation in the HOTSPOT. For testing, the heating plate is pressed against the optics of the HOTSPOT detector under test so that the entire field of view of the detector sensor is homogeneously excited.