Radar Level Gauge Reflector Arrangement for Proof Testing
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Solution Overview
Problem
Current radar level gauge systems require regular proof tests to maintain Safety Integrity Levels (SIL), which can be cumbersome and may not ensure reliable operation, especially in critical applications where malfunction could lead to dangerous situations.
Innovation Solution
A radar level gauge system with a reflector arrangement that includes a clamping member, a pliable metal wire, a weight, and a releasable fastener to securely position a reflector plate, allowing for easy installation and adjustment to ensure accurate signal reflection, and a method for proof testing that enables operators to verify the system's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regular proof tests are performed to maintain SIL-rating, then safety integrity is maintained, but operational time is lost and system complexity increases
Solution Approach 1:
The patent implements a self-test function that performs proof testing automatically during normal operation without requiring separate scheduled tests. The radar level gauge continuously monitors its own functionality by comparing measurements taken at different times, thereby maintaining SIL-rating while eliminating dedicated proof test time and reducing operational interruptions
2Reliability
If manual proof testing procedures are implemented, then safety requirements are met, but ease of operation deteriorates and human error risk increases
Solution Approach 1:
The radar level gauge performs self-diagnosis and self-testing automatically, with the system monitoring its own functional safety status. The device compares sequential measurements, detects anomalies, and generates test results without human intervention, thereby maintaining safety compliance while dramatically improving ease of operation and eliminating human error risks associated with manual testing procedures
Solution Approach 2:
The system continuously monitors its own operation by comparing measurements taken at different times and provides feedback on its functional safety status. This automatic feedback mechanism ensures safety requirements are met while eliminating the need for manual intervention, thereby improving ease of operation
3Measurement precision
If comprehensive proof testing is performed, then measurement precision is verified, but productivity decreases due to frequent testing requirements
Solution Approach 1:
The patent implements continuous periodic self-testing during normal operation, where the radar level gauge automatically performs measurement comparisons at predetermined intervals. This approach verifies measurement precision through frequent automated checks while minimizing impact on productivity, as the self-tests are integrated into normal operation rather than requiring separate dedicated testing periods
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
The solution enables reliable and efficient proof testing of radar level gauges, ensuring their accuracy and safety integrity, reducing the risk of malfunction and enhancing operational safety in critical applications.
Implementation Method 1
Radar level gauging is generally performed by propagating an electromagnetic transmit signal towards the product contained in a tank, and receiving an electromagnetic surface reflection signal resulting from reflection of the transmit signal at the surface of the product
Implementation Method 2
receiving an electromagnetic surface reflection signal resulting from reflection of the transmit signal at the surface of the product
Implementation Method 3
the distance to the surface is determined based on the time-of-flight of the pulse to the surface and back to the radar level gauge
Implementation Method 4
In FMCW-systems, a signal with a time-varying frequency is transmitted towards the surface and the distance is determined based on the frequency (and/or phase) difference between a transmitted signal and a simultaneously received signal
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
The present invention relates to reflector arrangement for proof test of a radar level gauge and to a radar level gauge system comprising such a reflector arrangement. The reflector arrangement comprises a pliable elongated member for attachment to a fixed structure in the tank; a weight attachable to the pliable elongated member; and a reflector member for reflecting an electromagnetic signal impinging on the reflector plate. The weight is configured to be coupled to the reflector member in such a way that an orientation of the weight determines an orientation of the reflector member.