Digital Pressure Transducer Temperature Compensation
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Solution Overview
Problem
Existing pressure transducers face challenges in accurately compensating for temperature variations, leading to inaccurate readings, and require complex recalibration processes, often necessitating the replacement of both the transducer and host device, especially when malfunctions occur.
Innovation Solution
A digital pressure transducer with integrated sensors, memory for correction algorithm coefficients, an analog-to-digital converter, and a microprocessor that allows for on-device temperature compensation and recalibration, enabling separate communication with a host device and a computer terminal, facilitating recalibration and calibration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature compensation is performed using multiple tables and mathematical functions, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the temperature compensation algorithm and correction coefficients from the host device and embeds them directly into the pressure transducer's microprocessor and memory. This separates the compensation function from the host system, allowing the transducer to independently perform temperature compensation calculations using stored correction algorithms, thereby improving measurement precision without increasing host device complexity
Solution Approach 2:
The patent performs preliminary calibration to determine correction algorithm coefficients during manufacturing, storing these coefficients in the transducer's memory before deployment. This preliminary action eliminates the need for complex real-time calibration procedures during operation, as the transducer automatically applies pre-determined correction coefficients to compensate for temperature variations, improving precision while maintaining simple operation
2Loss of time
If recalibration is performed in the field, then loss of time is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent enables the pressure transducer to perform self-recalibration in the field by providing a user interface that allows operators to input known pressure values and have the transducer automatically adjust its correction algorithm coefficients. This self-service capability eliminates the need for external calibration equipment and expert intervention, reducing recalibration time while maintaining manufacturing precision through automated calculation of correction coefficients based on actual field conditions
3Reliability
If the transducer and host device are replaced together, then reliability is improved, but loss of substance increases
Solution Approach 1:
The patent segments the pressure measurement system into independent modular components: the pressure transducer with integrated temperature compensation and the host device. This segmentation allows the transducer to be replaced or upgraded independently without replacing the host device, improving reliability through targeted replacements while reducing waste by reusing functional components. The independent modular design enables selective replacement of only the faulty component rather than the entire system
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 accurate temperature-compensated pressure measurements, allows for in-field recalibration without replacing the host device, and ensures the digital pressure transducer can be reused with different installations without metrological verification, enhancing accuracy and reducing operational complexity.
Implementation Method 1
at least one sensor that provides an analog output signal related to the pressure and temperature of a sensing element
Data Source
AI summary
A digital pressure transducer includes a sensor, a memory component and a microprocessor. A correction algorithm and set of correction coefficients are provided and stored in the memory. An application applies the correction coefficients to convert digitized values to pressure values. The transducer may include a read/write port adapted to communicate with a computer terminal; and at least one read-only port adapted to communicate with a host device. A method of calibrating a digital pressure transducer includes storing a correction algorithm and correction coefficients in the digital pressure transducer separate from a host device.