Integrated Sensor Platform Segmentation for Gas Detector Certification
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Solution Overview
Problem
The stringent regulatory certifications for portable gas detectors, including software and hardware evaluations, significantly prolong the development and commercialization process, making it difficult to introduce new features or products without recertification, leading to a competitive disadvantage.
Innovation Solution
An Integrated Sensor Platform that separates safety-critical and non-safety-related functions into distinct modules, allowing the sensor to determine alarm conditions and communicate with the main controller independently, thus reducing the need for extensive regulatory evaluations and enabling incremental updates without recertification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regulatory agencies evaluate and control all software in the detector, then safety and reliability are improved, but device complexity and development time increase significantly
Solution Approach 1:
The patent segments the detector software into two distinct parts: safety-critical software (alarm determination, fault detection) and non-safety software (user interface, display, wireless communication). The safety-critical software is embedded in the sensor module and remains unchanged, while non-safety software resides in the peripheral circuit and can be modified without recertification. This segmentation resolves the contradiction by limiting the scope of regulatory evaluation to only the safety-critical portion.
Solution Approach 2:
The patent extracts the safety-critical alarm determination logic from the main detector system and embeds it directly in the sensor module. This extracted safety core is then certified independently, while the remaining non-safety functions can be developed and modified separately. This extraction reduces the scope of software evaluation required for any modifications.
2Measurement precision
If each new instrument use requires recertification of the sensor, then measurement precision and reliability are ensured, but productivity and time to market decrease
Solution Approach 1:
The patent segments the sensor module into a certified safety-critical core (alarm determination logic) and a non-certified peripheral interface. The safety core is pre-certified and remains unchanged across different applications, while the peripheral circuit can be adapted for different uses without requiring recertification of the entire sensor system.
Solution Approach 2:
The patent creates a universal certified sensor module that can be used across multiple different detector applications and peripheral circuits. The safety-critical alarm determination logic is designed to be application-agnostic, allowing the same certified module to serve multiple purposes without requiring re-certification for each new instrument use.
3Reliability
If all software in the detector is controlled by regulatory agencies, then reliability is improved, but adaptability and ease of adding features deteriorate
Solution Approach 1:
The patent divides the detector into a certified safety-critical portion (sensor module with alarm logic) and an uncertified non-safety portion (peripheral circuit with user interface and communication functions). This segmentation allows the safety-critical portion to remain under regulatory control while the non-safety portion can be freely adapted and updated to meet changing market requirements.
Solution Approach 2:
The patent creates a dynamic system where the non-safety peripheral circuit can be easily modified, updated, or replaced without affecting the certified safety core. This dynamic architecture enables the system to adapt to new features and requirements while maintaining the stability and certification of the safety-critical alarm determination logic.
Data Source
AI summary
An integrated system platform includes a sensor containing an embedded microcontroller and associated circuitry for providing safety critical functionality. Signal conditioning circuitry is coupled to the sensor along with gas concentration determining circuitry, alarm status circuitry and fault status evaluation circuitry. Wherein the sensor is operational with a main control module and at least one alarm output device.