Integrated Sensor Transmitter Galvanic Isolation
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Solution Overview
Problem
Conventional process sensors require separate transmitters for measurement, calibration, and communication with process control systems, leading to errors, increased costs, and complexity, especially when dealing with multiple sensors or sensors with special requirements, and they struggle with temperature stability and interference issues.
Innovation Solution
A device that integrates an electronics unit inseparably with the sensor, providing self-monitoring capabilities, automatic power supply, and interfaces for both digital and analog communication, with galvanic isolation, allowing for direct connection to process control systems and eliminating the need for external transmitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are connected to separate transmitters via cables and connectors, then signal transmission can be achieved, but measurement accuracy deteriorates due to ground loops and leakage currents
Solution Approach 1:
The patent combines the transmitter electronics directly with the sensor in an integrated unit, eliminating the need for separate cables and connectors between sensor and transmitter. This merging removes the physical pathways for ground loops and leakage currents, thereby improving measurement accuracy while maintaining signal transmission capability.
2Productivity
If multiple sensors are used in a production plant, then measurement coverage is improved, but the risk of sensor confusion and operational errors increases
Solution Approach 1:
The integrated sensor-transmitter unit incorporates automatic self-identification capabilities, where the device automatically provides its identity and parameters to the control system without requiring manual configuration or matching. This self-service approach eliminates sensor confusion even when multiple sensors are deployed, maintaining both productivity and reliability.
3Adaptability or versatility
If transmitters are equipped with full functionality for measurement, calibration, and communication, then operational capability is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent extracts the complex configuration, calibration, and communication management functions from the transmitter and relocates them to a central control system. The integrated sensor unit retains only the essential measurement and signal transmission functions, thereby reducing device complexity and maintenance requirements while preserving full operational capability through centralized management.
Data Source
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AI summary
The device has an electronic unit (3) inseparably connected with a process sensor (22) e.g. pH-sensor. The electronic unit comprises a functional block (18) for monitoring a condition of the sensor, and a functional block (17) for digitalizing the data from the sensor and transmitting the analog and digitized data. An analog interface (19) e.g. 4-20 milliamperes interface, and a digital interface (20) e.g. RS-485interface, connect the device with a process control system (5), where measuring medium and the interfaces are galvanically separated. An independent claim is also included for a method for monitoring and adjusting a measuring device.