Loop-Powered Wireless Transmitter for Remote LOI Configuration
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Solution Overview
Problem
Process variable transmitters powered by two-wire process control loops have limited power availability, restricting the functionality of Local Operator Interfaces (LOIs) and competing with other critical transmitter components for power, leading to reduced LOI functionality and prioritization of other transmitter improvements over new LOI functionality.
Innovation Solution
Implementing a general-purpose wireless communication module powered by the two-wire process control loop, allowing communication with general-purpose mobile devices using standards like Bluetooth Low Energy, enabling remote configuration, calibration, and operation of process variable transmitters through mobile devices, thus offloading LOI functionality and enhancing usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a wireless communication module is added to the process variable transmitter, then LOI functionality and usability are enhanced, but power consumption increases
Solution Approach 1:
The wireless communication module operates in periodic cycles, alternating between active communication mode and low-power sleep mode. The module wakes up at predetermined intervals to transmit or receive data, then returns to sleep mode to conserve power. This periodic operation enables the transmitter to maintain essential LOI functionality while significantly reducing average power consumption to fit within the limited power budget of the two-wire process control loop.
Solution Approach 2:
The system dynamically adjusts communication parameters such as transmission power, data rate, and wake-up interval based on operational requirements and power availability. By changing these parameters, the system can optimize the balance between LOI functionality and power consumption, allowing enhanced usability when power is sufficient while ensuring operation within power constraints when energy is limited.
2Adaptability or versatility
If wireless communication module is implemented, then remote configuration capability is improved, but device complexity increases
Solution Approach 1:
The wireless communication module is designed to perform multiple functions including remote configuration, data transmission, diagnostic communications, and firmware updates. By consolidating these diverse functions into a single multi-functional module, the system achieves improved adaptability and versatility while minimizing the increase in device complexity that would result from adding separate dedicated components for each function.
Solution Approach 2:
The wireless communication module acts as an intermediary between the process variable transmitter and external devices such as smartphones or tablets. This intermediary enables remote configuration and enhanced LOI functionality without requiring direct integration of complex interfaces or processing capabilities into the transmitter itself, thereby achieving versatility while managing device complexity.
Data Source
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AI summary
A process variable transmitter includes transmitter circuitry for determining a process variable from a sensor signal produced using a process sensor. The transmitter circuitry has at least one operating parameter. The process variable transmitter also includes a wireless communication module configured to be powered by a two-wire process control loop. The wireless communication module is capable of communicating wirelessly with a general-purpose mobile device using a general-purpose wireless communication standard such that the wireless communication module can instruct the transmitter circuitry to change a value of the at least one operating parameter based on a wireless message received from the general-purpose mobile device.