Level Sensor Safe Mode Switching for SIL and Measuring Rate
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Solution Overview
Problem
Measuring devices, particularly level sensors, face challenges in meeting safety integrity level (SIL) requirements, leading to reduced availability and lower measuring rates due to stringent safety demands.
Innovation Solution
A level sensor with dual software operation modes - safe and non-safe - allowing seamless transition between these states, ensuring compliance with SIL requirements while maintaining high availability and measuring rates. This involves separate software components, activation methods, and fault messaging to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SIL requirements are implemented in the level sensor, then safety and reliability are improved, but availability and measuring rate deteriorate
Solution Approach 1:
The software is divided into two separate modes: safe operating mode and non-safe operating mode. Each mode has its own software component that can be independently activated. This segmentation allows the system to switch between safety-critical operations and high-performance operations without compromising either aspect.
Solution Approach 2:
The level sensor implements dynamic switching capability between safe and non-safe operating modes through activation commands. The system can transition from safe mode with lower measuring rates to non-safe mode with higher measuring rates based on operational requirements, making the system adaptable to different operational contexts.
2Reliability
If safe software operation is activated with commissioning and diagnostics, then reliability is improved, but device complexity and activation time increase
Solution Approach 1:
The safe software mode includes pre-configured commissioning and diagnostic functions that are automatically executed when activated. The activation command triggers a standardized sequence of preliminary actions including parameterization protection, diagnostics, and commissioning steps, reducing the need for manual configuration and simplifying the activation process.
Data Source
AI summary
A level sensor configured to activate a safe operating state is provided, including an input Interface configured to receive a first activation command to start a first activation method for activating the safe operating state; and a controller connected to the input interface and being configured to perform the first activation method after receiving the first activation command.