Multivariable Pressure Transmitter Temperature Compensation
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Solution Overview
Problem
Multivariable process fluid pressure transmitters face temperature-induced errors due to the lack of accurate temperature compensation, especially under transient conditions and temperature gradients between differential and static pressure sensors, leading to inaccuracies in measurements.
Innovation Solution
Incorporating a first temperature sensor directly coupled to the differential pressure sensor and a second temperature sensor directly coupled to the static pressure sensor within the sensor module, allowing for independent compensation calculations for each pressure sensor, thereby reducing temperature-induced errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single temperature sensor is used for both differential and static pressure sensors, then device complexity is reduced, but measurement precision deteriorates due to temperature gradients between sensors
Solution Approach 1:
The patent divides the temperature measurement function into separate segments by providing individual temperature sensors for the differential pressure sensor and static pressure sensor. This segmentation allows each pressure sensor to have its own dedicated temperature compensation, resolving the measurement precision issue while maintaining reasonable device complexity through modular temperature sensing architecture.
Solution Approach 2:
The patent applies local quality by placing temperature sensors in close proximity to each pressure sensor, ensuring that each temperature sensor measures the local temperature at the specific pressure sensor location. This local temperature measurement enables accurate compensation for temperature-induced errors specific to each sensor, improving overall measurement precision.
2Ease of operation
If temperature compensation is implemented using a single temperature reading, then ease of operation is improved, but reliability deteriorates under transient temperature conditions
Solution Approach 1:
The patent segments the temperature compensation process into independent calculations for each pressure sensor, using separate temperature readings. This segmentation maintains ease of operation through standardized compensation algorithms while significantly improving reliability under transient conditions by capturing the actual temperature state of each sensor at the measurement moment.
Solution Approach 2:
The patent implements feedback by continuously monitoring the temperature at each pressure sensor location and using this real-time temperature information to adjust the compensation calculations. This feedback mechanism ensures that the compensation remains accurate during transient temperature conditions, improving measurement reliability while maintaining operational simplicity through automated compensation.
3Ease of manufacture
If temperature sensors are placed远离 from pressure sensors, then ease of manufacture is improved, but measurement precision deteriorates due to temperature gradient measurement errors
Solution Approach 1:
The patent segments the sensing functions by placing dedicated temperature sensors in immediate proximity to each pressure sensor, ensuring accurate local temperature measurement. This segmentation approach prioritizes measurement precision while the modular design actually simplifies manufacturing by allowing independent assembly and testing of sensor modules.
Solution Approach 2:
The patent applies the nested doll principle by integrating the temperature sensor within or immediately adjacent to the pressure sensor housing, creating a compact sensor module. This nesting ensures accurate local temperature measurement while maintaining ease of manufacture through integrated module assembly, eliminating the need for separate mounting of temperature and pressure sensors.
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 enhances the accuracy of pressure measurements by providing precise temperature compensation for both differential and static pressure sensors, even under transient conditions, leading to improved measurement reliability and accuracy.
Implementation Method 1
A first temperature sensor is disposed within the sensor module and is configured to provide an indication of a temperature of the differential pressure sensor
Implementation Method 2
A second temperature sensor is disposed within the sensor module and is configured to provide an indication of a temperature of the static pressure sensor
Implementation Method 3
A differential pressure sensor is disposed within the sensor module and is operably coupled to a plurality of process fluid pressure inlets
Implementation Method 4
A static pressure sensor is also disposed within the sensor module and is operably coupled to at least one of the process fluid pressure inlets
Data Source
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AI summary
A multivariable process fluid pressure transmitter (10) includes an electronics module (18) and a sensor module (222). The sensor module (222) is coupled to the electronics module (18). A process fluid temperature sensor is coupled to the process fluid pressure transmitter. A differential pressure sensor (228) is disposed within the sensor module (22) and is operably coupled to a plurality of process fluid pressure inlets. A static pressure sensor (230) is also disposed within the sensor module (222) and is operably coupled to at least one of the process fluid pressure inlets. A first temperature sensor (232) is disposed within the sensor module (222) and is configured to provide an indication of a temperature of the differential pressure sensor (228). A second temperature sensor (234) is disposed within the sensor module (222) and is configured to provide an indication of a temperature of the static pressure sensor (230). Measurement circuitry (328) is operably coupled to the differential pressure sensor (228), the static pressure sensor (230), and the first (232) and second (234) temperature sensors. A processor (326) is coupled to the measurement circuitry (328) and is configured to provide a compensated differential pressure output based on a measurement of the differential pressure sensor (238) and the first temperature sensor (232), and to provide a compensated static pressure output based on a measurement of the static pressure sensor (230) and the second temperature sensor (234).