The Thermo detector TM 3/9 Plus complements GreCon's portfolio of preventive fire protection detectors. With this thermo detector, which monitors the surface temperatures even more flexibly than before, the surface temperature can be measured using three contact sensors at freely selectable points. If the temperature exceeds a previously set limit, the unit is automatically switched off. In this way, the risk of fire from smoldering fires due to dust deposits on housing surfaces can be significantly reduced. In addition, the additional high-precision temperature values gained in this way open up new possibilities for analysis, for example to derive preventive action.