Impedance Level Sensor Current Meter Integration
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Solution Overview
Problem
Impedance point level sensors face measurement errors due to temperature fluctuations, leading to false switching commands, especially when detecting fill levels in varying media like ketchup, as the electronics unit's temperature sensitivity affects frequency generator and detector performance.
Innovation Solution
Incorporating a current meter within the electronics unit to detect the current at the signal generator's input, allowing resonance frequency determination through current measurement, which reduces temperature sensitivity and eliminates the need for a separate signal detector, thereby simplifying the sensor design and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate signal detector is used to analyze the measuring oscillation circuit, then measurement precision is improved, but device complexity increases and temperature sensitivity worsens
Solution Approach 1:
The patent combines the signal generator and signal detector into a single integrated circuit. The signal generator generates the excitation signal while the same circuit analyzes the response signal to determine resonance frequency. This merging eliminates the need for separate detector components, reducing device complexity while maintaining measurement precision through the unified circuit design.
Solution Approach 2:
The integrated circuit performs multiple functions: it generates the excitation signal, receives the response signal from the measuring oscillation circuit, and analyzes the resonance frequency. This multi-functional approach replaces what would traditionally require separate dedicated components for each function, simplifying the overall device architecture.
2Measurement precision
If a separate signal detector is used to analyze the measuring oscillation circuit, then measurement precision is improved, but temperature sensitivity worsens
Solution Approach 1:
By integrating the signal generator and detector into one circuit block, the patent reduces the number of discrete electronic components exposed to temperature variations. The unified design minimizes temperature drift effects that would accumulate across multiple separate components, thereby reducing overall temperature sensitivity while preserving measurement accuracy.
3Measurement precision
If multiple separate components are used in the electronics unit, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements the signal generation and analysis functions within a single integrated circuit rather than using multiple discrete components. This consolidation reduces the bill of materials, simplifies assembly processes, and lowers manufacturing costs while maintaining the measurement precision required for accurate resonance frequency detection.
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
This approach significantly reduces temperature sensitivity and measurement errors, enabling more accurate fill level detection with fewer and less expensive components, while maintaining operational efficiency across different temperatures and media conditions.
Implementation Method 1
a resonance frequency fres of the oscillation circuit is set for various media and/or covering conditions (empty, full, and contaminated) between 100 MHz and 200 MHz
Implementation Method 2
the electronics unit (101) comprises a current meter (402) for detecting a current at an input of the signal generator (103)
Implementation Method 3
a measuring capacity (110) forming between a measuring electrode (106) and a reference electrode (108)
Data Source
AI summary
Impedance level sensor witha probe, which is influenced by a medium surrounding the probe in a measuring capacity, with the probe comprising a measuring electrode and a reference electrode isolated from the measuring electrode, between which the measuring capacity forms,a measuring oscillation circuit, in which the probe is arranged as a capacity-determining element,an electronic unit with a signal generator to excite the measuring oscillation circuit,an evaluation and control unit for generating a measuring signal, which is connected to the electronic unit,characterized in that the electronic unit comprises a current meter for detecting a current at the input of the signal generator.