Method and apparatus for calibrating a thermometer in situ
AssigneeEndress + Hauser Wetzer GmbH + Co. KG
InventorsMarc Schalles, Dirk Boguhn, Peter Seefeld, Reinhard Buchner
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Abstract
The invention relates to an apparatus for the calibration of a thermometer in situ, wherein the apparatus has a temperature sensor (S) for determining a temperature (T); wherein a reference element (K) is provided for calibrating the temperature sensor (S); wherein the reference element (K) at least partially comprises a ferroelectric material (D), which experiences a phase transformation at at least one predetermined temperature (TPh) in a temperature range relevant for calibrating the temperature sensor (S).
Claims26
An apparatus for calibrating or validating a thermometer in situ, having:
- a temperature sensor for determining a temperature;
- and
- a reference element for calibrating said temperature sensor, wherein:
- said reference element at least partially comprises a ferroelectric material, which experiences a phase transformation at at least one predetermined temperature in a temperature range relevant for calibrating or validating said temperature sensor,
- said temperature sensor and said reference element are integrated in a thermometer component and wherein said reference element is arranged next to said temperature sensor and is sufficiently close to the same temperature as the temperature sensor, and
- said ferroelectric material serves as a substrate for said temperature sensor, wherein said temperature sensor is located on said substrate.
Method for calibrating a thermometer in situ, comprising the steps of:
- using a temperature sensor for determining the temperature;
- using a reference element for calibration and/or monitoring of said thermometer,
- wherein said reference element at least partially comprises a ferroelectric material, said ferroelectric material serves as a substrate for said temperature sensor and said temperature sensor is located on said substrate;
- and
- using a phase transformation of said ferroelectric material at at least one predetermined temperature for calibrating said temperature sensor;
- exposing said temperature sensor and said reference element to at least one predetermined temperature at which a phase transformation of the ferroelectric material occurs,
- evaluating measured values or measuring signals obtained by said temperature sensor or reference element, and
- using said measured values or measuring signals for calibrating and/or monitoring the state of the temperature sensor or thermometer.
Dependencies are inferred from the claim text.