a temperature sensor includes a substrate , a platinum resistor arranged on at least one surface of the substrate , a protective layer covering at least a portion of the platinum resistor and a cover layer covering at least a portion of the protective layer , the cover layer including al2o3 , sio2 and y2o3 . the cover layer may also include b2o3 . a conductive wire may be electrically connected to the platinum resistor . a glass ceramic may be covering at least a portion of the conductive wire , platinum resistor , protective layer and cover layer .