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Device and method for the in situ calibration of a thermometer

An in-situ calibration and temperature measurement technology, applied in the field of temperature devices, can solve problems such as errors and inaccuracies, and achieve the effect of compact structure, high precision and high precision measurement

Pending Publication Date: 2019-08-23
EHNDRESS KHAUZER GMBKH KO KG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of calibrating and / or verifying temperature sensors by means of reference elements, this can disadvantageously lead to errors and / or inaccuracies

Method used

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  • Device and method for the in situ calibration of a thermometer
  • Device and method for the in situ calibration of a thermometer
  • Device and method for the in situ calibration of a thermometer

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Embodiment Construction

[0050] figure 1 is a schematic diagram of a thermometer 1 with a protective tube 2 and an electronic unit 4 according to the prior art. The part of the protective tube 2 facing the liquid 5 is also referred to as the sensor head 3 . The inner volume of the sensor head 3 is filled with a filler 6 , especially an electrically insulating filler 6 , especially cement. Furthermore, a temperature sensor 7 and a reference element 8 are arranged inside the sensor head 3 , each of which is in contact, in particular electrically, with electronic Unit 4 is connected. The temperature sensor 7 is, for example, a resistance element or a thermocouple. The reference element 8 instead consists at least partially of a material, in which case at least one phase transition of at least second order occurs at at least one predetermined phase transition temperature in the temperature range relevant to the operating device. The number of connecting wires 9 , 10 required for contacting the tempera...

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Abstract

The invention relates to a device (1) for determining and / or monitoring the temperature (T) of a medium (5). The device (1) includes at least one first temperature sensor (13) for determining the temperature (T) of the medium (5); a reference element (8) for the in situ calibration and / or validation of the device (1), said reference element (8) at least partly consisting of a material which undergoes at least one phase transition at at least one specified phase transition temperature (Tph) within a temperature range which is relevant to the operation of the device (1), said material remainingin the solid phase during the phase transition, wherein at least one first (11) and a second (12) electrically conductive electrode is arranged on the reference element (8), said first (11) and secondelectrode (12) being electrically insulated from each other; a first connection line (9a) for contacting the first electrode (11), in particular in an electric manner, and a second connection line (9b) for contacting the second electrode (12), in particular in an electric manner. According to the invention, a third connection line (9c) is provided which consists of a material that differs at least from the material of the first (9a) or second connection line (9b). The third connection line (9c) is arranged such that the third connection line together with the first (9a) or the second (9b) connection line forms the first temperature sensor (13) in the form of a first thermoelement. The invention additionally relates to a method for the in situ calibration and / or validation of a device according to the invention.

Description

technical field [0001] The invention relates to a device for determining and / or monitoring the temperature of a liquid, said device comprising a first temperature sensor and a reference element and at least three connecting lines. Furthermore, the invention relates to an in situ calibration and / or verification method for the device of the invention. Background technique [0002] Today, calibration of thermometers is usually performed in calibration baths, calibration furnaces or fixed point systems. A corresponding fixed point unit is described, for example, in DE 10 2004 027 072 B3. However, in the case of these methods it is usually necessary to remove the thermometer from the measuring point. In contrast, in order to be able to calibrate the thermometer in the installed state, DE19941731A1 discloses a miniaturized fixed point unit provided in the thermometer. Fixed point cells are filled with a fixed point substance, such as a metal or eutectic alloy. In this case, ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/02G01K15/00
CPCG01K7/02G01K15/00G01K15/005
Inventor 迈克尔·科恩阿尔弗雷德·乌姆克雷尔
Owner EHNDRESS KHAUZER GMBKH KO KG
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