Pressure Sensor Compensation Line for Thermal Error Correction
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Solution Overview
Problem
Existing pressure sensors in high-temperature processing environments suffer from temperature-induced and mechanical measurement faults due to expansion of the transfer medium in the diaphragm seal and capillaries, which are not effectively compensated without additional costly temperature sensors.
Innovation Solution
Incorporating a compensation line parallel to the measurement line, both filled with the same transfer medium and subjected to identical processing conditions, to mechanically and electronically compensate for temperature and mechanical influences, eliminating the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional temperature sensors are installed inside the diaphragm seal and pressure measuring cell to detect temperature-induced measurement faults, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a compensation line that is a simplified copy of the measurement line, containing the same transfer medium and subjected to the same temperature conditions but without the diaphragm seal. This copy allows temperature effects to be measured without requiring complex additional sensors inside the diaphragm seal, thus improving measurement precision while avoiding increased device complexity
Solution Approach 2:
The compensation line acts as an intermediary element that indirectly measures temperature effects on the transfer medium. Instead of directly measuring temperature with additional sensors inside the diaphragm seal, the system uses the compensation line as a mediator to detect and compensate for temperature-induced pressure changes, reducing device complexity
2Measurement precision
If additional temperature sensors and electronic compensation systems are added to compensate for temperature-induced measurement faults, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The compensation line is constructed as a simplified copy using the same transfer medium and similar routing as the measurement line, but without requiring expensive additional temperature sensors or complex electronic compensation systems. This approach improves measurement precision while keeping manufacturing costs low
Solution Approach 2:
The system uses the compensation line to automatically detect and provide compensation data for temperature effects. The electronic measuring system uses this compensation data to automatically correct measurement errors, creating a self-compensating system that reduces the need for expensive additional hardware
3Adaptability or versatility
If the measurement line is exposed to high processing temperatures to transfer pressure from the diaphragm seal, then the pressure sensor can measure in high-temperature environments, but temperature-induced measurement faults occur due to expansion of the transfer medium
Solution Approach 1:
The patent separates the temperature exposure function from the pressure measurement function. The compensation line is exposed to high processing temperatures to experience the same thermal expansion effects, while the measurement line remains protected. This segmentation allows the system to maintain adaptability to high-temperature environments while improving measurement precision through compensation
Solution Approach 2:
The compensation line serves as an intermediary that experiences the full thermal effects of the processing environment and transmits this information to the electronic measuring system. This mediator allows the system to adapt to high-temperature environments while maintaining measurement precision by using the compensation data to correct for thermal expansion effects
4Ease of operation
If the measurement line and compensation line are routed separately, then installation flexibility is improved, but mechanical influences such as strong bending can falsify measurements
Solution Approach 1:
The patent merges the measurement line and compensation line into a common protective cover or housing that protects both lines from mechanical influences such as strong bending. This merging maintains installation flexibility while improving measurement precision by ensuring both lines experience the same mechanical conditions
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 provides precise and cost-effective compensation of measurement faults by ensuring identical thermal and mechanical effects on both lines, reducing measurement errors and operational costs.
Implementation Method 1
The temperature induced measurement faults result here in an expansion of the transfer medium contained in the diaphragm seal and the capillaries, which leads to a pressurization of the pressure measuring cell
Data Source
AI summary
A pressure sensor comprising at least a pressure measuring cell, a pressure balancer, as well as at least one measurement line to transfer a pressure applied to the pressure means to the pressure measuring cell, wherein the pressure sensor comprises at least one compensation line showing the same features as the measurement line, which is arranged parallel in reference to the measurement line.