Patent ID: 8231266

Claim:
An apparatus for ascertaining and/or monitoring the temperature of a medium in a container or in a tube or pipe, comprising: a housing; at least one temperature sensor; at least one reference temperature sensor; and at least one heating/cooling unit, which is thermally coupled with said at least one temperature sensor and with said at least one reference temperature sensor, wherein: said at least one temperature sensor and said at least one heating/cooling unit are arranged in said housing, which housing protects against the medium; in a calibration phase the measured temperature values from said at least one temperature sensor and said at least one reference temperature sensor resulting from corresponding temperatures that act on said at least one temperature sensor and said at least one reference temperature sensor are compared and used for a calibration of said at least one temperature sensor; and the corresponding temperatures are achieved by way of specific temperatures that can be achieved via the heating/cooling unit.