Temperature Probe Cable Segmentation for Thermal Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing thermometers in process automation often face challenges in achieving thermal balance, leading to temperature gradients and measurement errors due to factors like sensor length, sedimentation, and deteriorating thermal coupling, making accurate temperature measurement costly and difficult to reproduce.
Innovation Solution
A resistance thermometer with a 4-wire circuit where one connection cable is replaced with a different material to measure thermoelectric voltage, allowing for detection of thermal balance and heat dissipation errors using a thermocouple integrated in the connection cables, enabling monitoring of temperature gradients and predictive correction of measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the thermometer is made too short to achieve complete thermal balance, then the device complexity and installation cost are reduced, but temperature gradient and measurement error increase
Solution Approach 1:
The connection cable is segmented into different material sections (first section with first material, second section with second material), creating a thermocouple structure that enables temperature gradient detection without requiring a longer thermometer for thermal balance
Solution Approach 2:
A thermocouple is introduced as an intermediary element within the connection cable to detect temperature gradients. The thermocouple generates a thermoelectric voltage that serves as a mediator to indicate thermal balance status, allowing accurate measurement without extending the thermometer length
2Measurement precision
If diagnostic methods for thermal balance are implemented using existing literature approaches, then measurement accuracy can be maintained, but cost and signal analysis complexity increase significantly
Solution Approach 1:
The diagnostic function is merged into the existing connection cable by incorporating different material sections that form a thermocouple. This combines the connection function and diagnostic function into a single integrated structure, eliminating the need for separate diagnostic equipment and complex signal analysis
Solution Approach 2:
The connection cable is given multiple functions: it serves both as an electrical connection for the resistance thermometer and as a temperature gradient detector through its thermocouple structure. This multi-functionality reduces the need for additional components and simplifies the overall system
3Reliability
If sediment layers form on the protective tube or thermal coupling deteriorates over time, then initial measurement accuracy is maintained, but long-term measurement reliability decreases
Solution Approach 1:
The thermocouple structure provides continuous feedback about the thermal balance status through thermoelectric voltage generation. This feedback mechanism enables real-time monitoring of measurement quality, allowing detection of deteriorating thermal coupling or sedimentation that would otherwise go unnoticed
Solution Approach 2:
The system performs preliminary detection of thermal balance status through the thermocouple before actual temperature measurement is compromised. This allows for early warning and corrective action before measurement accuracy is significantly affected by sedimentation or coupling deterioration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution simplifies diagnostics for thermal balance and heat dissipation errors, providing accurate temperature measurements and reducing the complexity of signal analysis, allowing for effective monitoring and correction of measurement issues.
Implementation Method 1
a piece of the connection cable from one of the four connection wires (all of which are located close to the sensor) is replaced with a different material (see FIG. 1), so that, between the connection cables 1 and 2, a thermoelectric voltage can be measured using the Seebeck effect, as soon a temperature gradient is created along the 'red wire'.
Implementation Method 2
a temperature-dependent measuring element, which can be contacted via at least a first connection cable and at least a second connection cable
Data Source
AI summary
The invention relates to a temperature probe (10) comprising a temperature-dependent measuring element (ME), which measuring element (ME) can be contacted via at least a first connecting line (1) and at least a second connecting line (2), the first connecting line (1) having a first and a second portion (T1, T2), and the first and the second portions (T1, T2) consisting of different materials.