Wireless Valve Position Sensing With Magnetometer Calibration
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Solution Overview
Problem
Existing valve monitoring systems are costly and inefficient, particularly in large and complex processing plants, as they require cabled connections and manual inspection to determine valve positions, limiting their application and accuracy.
Innovation Solution
A low-cost valve position sensor system using a magnetometer and gyroscope with a processing unit for calibration and wireless data transmission, allowing remote and reliable monitoring of valve positions without cabling, powered by a battery for extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cabled monitoring equipment is used to determine valve positions, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces mechanical cabled connections with wireless communication technology. The sensor unit communicates valve position data wirelessly to external systems, eliminating the need for physical cable connections while maintaining measurement precision. This substitution resolves the contradiction by removing the complexity of cabled infrastructure.
Solution Approach 2:
The patent uses magnetometer data to create a digital representation (copy) of the valve position state. By comparing current magnetometer readings with calibration data stored in memory, the system determines valve position without physical connections. This copying approach enables accurate measurement while eliminating complex cabled systems.
2Reliability
If cabled sensors are installed on all valves in large plants, then reliability of valve position monitoring is improved, but loss of time and cost for installation and maintenance increase
Solution Approach 1:
The sensor unit is designed as a self-contained wireless device with integrated power (battery), sensing (magnetometer), processing, and communication capabilities. It autonomously performs calibration during initial valve rotation and continuously monitors position without requiring external cabling or frequent maintenance, thereby reducing installation and maintenance time while maintaining reliability.
Solution Approach 2:
The system performs automatic calibration during the initial rotation of the valve, storing calibration data in memory before normal operation begins. This preliminary calibration action ensures reliable measurement from the start without requiring separate calibration procedures or repeated maintenance interventions.
3Device complexity
If manual inspection methods are used to determine valve positions, then device complexity is reduced, but measurement precision and productivity decrease
Solution Approach 1:
The patent replaces manual visual inspection with automated wireless sensing. The magnetometer automatically detects magnetic field changes corresponding to valve position, and the processing unit continuously determines position data without human intervention. This substitution maintains simplicity by avoiding complex cabled systems while dramatically improving productivity through automated, continuous monitoring.
Solution Approach 2:
The sensor unit autonomously performs all measurement and communication functions without requiring manual operation. It automatically calibrates during initial valve rotation, continuously monitors position, and wirelessly transmits data, thereby improving productivity while keeping the device conceptually simple and easy to install.
4Ease of operation
If wireless sensor units with magnetometers are used, then ease of installation and cost are improved, but measurement precision may be affected by magnetic field variations
Solution Approach 1:
The system performs automatic calibration during the initial rotation of the valve, capturing magnetometer data at known reference positions and storing it in memory. This preliminary calibration creates a reference framework that compensates for local magnetic field variations, ensuring accurate position measurement throughout operation while maintaining the simplicity of wireless installation.
Solution Approach 2:
The processing unit continuously compares current magnetometer readings with the stored calibration data to determine valve position. This feedback mechanism allows the system to adapt to magnetic field conditions and maintain measurement precision by referencing the calibrated baseline, resolving the concern about magnetic field variations affecting accuracy.
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
Enables comprehensive and accurate monitoring of valve positions across multiple valves, reducing maintenance costs and time, with easy installation and operation, providing critical information for process control and maintenance planning.
Implementation Method 1
a magnetometer and a gyroscope; a processing unit configured to perform a calibration routine during an initial rotation of the valve (12) to associate magnetometer data received from the magnetometer with valve position data
Implementation Method 2
one or more micro sensors, the one or more micro sensors including a magnetometer and a gyroscope
Data Source
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AI summary
A valve position sensor (1) is described. The valve position sensor comprises a sensor housing (10) for placement on a moving component of a valve (12); a print circuit board assembly disposed within the housing, the print circuit board assembly comprising: one or more micro sensors, the one or more micro sensors including a magnetometer; a processing unit configured to receive data from the magnetometer and compare the received magnetometer data with predetermined calibration data to determine valve position data relating to an estimate of the valve position; and a transmitter for wirelessly transmitting event data including valve position data to an external receiver. The valve position sensor provides a low cost means to remotely determine the position of a valve.