Cold Junction Compensation for Serial Temperature Consoles
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Solution Overview
Problem
In multi-unit temperature control systems, the measurement error of cold junction compensation increases when the number of temperature-controlling consoles exceeds three, due to the influence of adjacent consoles on the center console's internal temperature, leading to inaccurate temperature readings.
Innovation Solution
A method for cold junction compensation that determines the arrangement order of consoles through a communication protocol, allowing each console to select its own compensation scheme and reduce measurement errors by using a master/slave communication system and serial connections to identify and adjust for thermal impacts from adjacent consoles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple temperature-controlling consoles are connected in series to meet different manufacture conditions, then the system can control more equipment, but the measurement error of cold junction compensation increases due to thermal influence from adjacent consoles
Solution Approach 1:
The system uses communication protocol to exchange identification information between consoles, allowing each console to receive feedback about its position in the series. Based on this feedback, the console automatically selects the appropriate cold junction compensation temperature corresponding to its arrangement order, thereby maintaining measurement precision while operating in a multi-console series configuration
Solution Approach 2:
The invention changes the compensation temperature parameter dynamically based on the console's arrangement order in the series. Instead of using a fixed room temperature compensation value, the system selects different compensation temperatures (e.g., 25℃ for first console, 20℃ for second console, etc.) according to the thermal influence from adjacent consoles, thus resolving the measurement error issue while maintaining system versatility
2Adaptability or versatility
If the number of temperature-controlling consoles in series exceeds three, then more equipment can be controlled, but the center console experiences larger internal temperature increment from adjacent consoles, increasing measurement error
Solution Approach 1:
The master console sends communication protocol data to identify the arrangement order of each slave console through master/slave communication. Each console receives feedback information about its position and automatically adjusts its cold junction compensation parameters accordingly, enabling accurate temperature measurement even when the number of consoles exceeds three
Solution Approach 2:
The system implements different cold junction compensation temperature parameters for different positions in the series. The first console uses 25℃ compensation, the second console uses 20℃ compensation, and so on, with each position having a specifically determined compensation temperature that accounts for thermal influence from adjacent consoles
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 approach effectively reduces temperature measurement errors in serially connected consoles by accurately accounting for thermal impacts from adjacent consoles, ensuring precise temperature control across multiple units.
Implementation Method 1
it generally measures temperature by thermal couple... a DC output will be generated
Data Source
AI summary
A compensation method for cold junction of temperature controlling console is used to compensate the temperature difference of cold junctions when a plurality of temperature controlling consoles are connected in series, where one temperature controlling console is master temperature controlling console and others are slave temperature controlling consoles. Each of the consoles has a serial input end, a serial output end and a master/slave communication end, where the serial output end of one slave console is connected to the serial input end of next slave console to form serial connection. The master/slave communication ends of all consoles are connected parallel. When the master temperature controlling console at end of the series sends a communication protocol data to all slave consoles, the slave consoles set their communication protocol to judge the positions thereof and then set the temperature compensation according to their position and their built-in program for cold junctions.