Electrode Liquid Level Detection with Calibration and Threshold Adjustment
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Solution Overview
Problem
Conventional electrode-type water level detectors inaccurately detect liquid levels due to changes in the resistance value of the measured object caused by temperature changes or electrode deterioration, leading to incorrect determination of contact with the measurement electrodes.
Innovation Solution
An electrode-type liquid level detection device and method that integrates at least two liquid level measurement electrodes and a calibration electrode, with a record unit to store initial resistance values and a control unit to adjust the threshold value based on changes in resistance values, ensuring accurate detection despite state changes or electrode deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed threshold value is used for detection, then the device structure is simple, but detection accuracy deteriorates due to resistance value changes from temperature or electrode deterioration
Solution Approach 1:
The patent applies preliminary action by measuring and storing the initial resistance values of electrodes before they undergo deterioration or temperature changes. This pre-measured baseline data is then used for comparison during operation to compensate for changes in resistance values, maintaining detection accuracy without requiring complex real-time calibration systems.
Solution Approach 2:
The patent implements feedback by continuously monitoring the resistance values of measurement electrodes, comparing them against stored initial values, and automatically adjusting the detection threshold based on the detected changes. This closed-loop feedback mechanism compensates for electrode deterioration and temperature effects, maintaining accurate detection despite component aging.
2Reliability
If measurement electrodes are continuously monitored for deterioration, then detection reliability is improved, but measurement time and processing complexity increase
Solution Approach 1:
The system performs preliminary measurement and storage of initial resistance values during electrode installation or calibration. This one-time preliminary action establishes a baseline that enables long-term reliable operation without requiring continuous complex monitoring, thus maintaining high reliability while minimizing time loss during normal measurement operations.
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 solution allows for accurate detection of liquid levels by accounting for state changes and electrode deterioration, preventing false negatives and improving the reliability of the detection system.
Implementation Method 1
When both the first water level measurement electrode 2 and the second water level measurement electrode 3 come in contact with the to-be-measured object 1, current flows between the first water level measurement electrode 2 and the second water level measurement electrode 3 via the to-be-measured object 1. The flow of the current through the relay unit 4 activates the relay unit 4
Implementation Method 2
The relay unit 4 includes a threshold adjustment unit 6, a relay coil 7, and a relay switch 8. When the current flowing through the relay coil 7 exceeds a relay operation threshold value, the relay switch 8 is activated
Data Source
AI summary
An electrode-type liquid level detection device comprises: an electrode unit in which at least two liquid level measurement electrodes, which are used to detect a liquid level, and a calibration electrode, which is not used to detect the liquid level, are integrated; a record unit that records a pre-use resistance value of each electrode of the electrode unit as initial resistance value; a calculation unit that calculates a resistance value of a to-be-measured object based on the initial resistance value; and a control unit that controls in such a way as to adjust a threshold value for determining whether or not the to-be-measured object exists, based on a change in resistance values of the at least two liquid level measurement electrodes when in use. Therefore, the liquid level can be accurately detected corresponding to deterioration of the instrument.