Fill Level Sensor Power Limiting With Peak Energy Storage
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Solution Overview
Problem
Measuring devices, particularly level sensors, face challenges in energy consumption and explosion protection in industrial environments, where they require peak power for measurements but must adhere to strict power limits to prevent sparks and excessive power peaks.
Innovation Solution
The measuring device incorporates a power limitation circuit between the input interface and signal processing circuit to limit continuous power, supplemented by an internal energy storage unit that provides peak power during measurement peaks, ensuring compliance with fire and explosion protection regulations without additional current limitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor unit is provided with high peak power for measurements, then measurement accuracy is improved, but explosion protection is compromised due to excessive power peaks
Solution Approach 1:
The energy storage device is charged during intervals between measurements so that when a measurement is required, sufficient energy is already stored to provide the necessary peak power without requiring high continuous power from the external supply, thus maintaining measurement accuracy while preventing explosion risks
Solution Approach 2:
The measuring device operates in periodic cycles where the energy storage device is charged during idle intervals and discharged during measurement intervals, allowing peak power to be delivered only when needed for measurements while maintaining safe average power levels for explosion protection
2Object-affected harmful factors
If a power limitation circuit is installed at the input interface, then explosion protection is improved, but peak power availability for measurements is reduced
Solution Approach 1:
The energy storage device acts as an intermediary between the power limitation circuit and the sensor unit, absorbing the limitation imposed by the power circuit during charging phases and then delivering the necessary peak power to the sensor unit during measurement phases without being constrained by the power limitation circuit
3Object-affected harmful factors
If continuous power is limited for safety, then explosion protection is improved, but measurement capability is degraded due to insufficient power
Solution Approach 1:
The system dynamically adjusts power delivery by maintaining low continuous power consumption through the energy storage device while being capable of delivering high peak power when measurements are performed, thus adapting the power profile to match safety requirements during idle periods and measurement requirements during active 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
This configuration allows for accurate measurements while maintaining safety standards by limiting continuous power and providing sufficient peak power, ensuring reliable operation without exceeding permissible power thresholds.
Implementation Method 1
an internal energy storage unit that provides peak power during measurement peaks
Data Source
AI summary
A measuring device is provided. The measuring device includes a sensor unit configured to detect a measurement signal, upstream measuring device electronics that include a signal processing circuit and an input interface, and a power limitation circuit arranged to limit the power supplied by the external power supply at the input interface.