Liquid Level Detector Capacitance Adjustment Circuit
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Solution Overview
Problem
Conventional liquid level detecting circuitry in automatic analyzing apparatuses fails to accurately detect liquid levels when instruments such as piercer needles or heaters are connected, as the automatic phase shifting circuitry cannot absorb resulting output variations, leading to degraded accuracy.
Innovation Solution
Incorporating a capacitance adjusting circuitry that adjusts the electrostatic capacitance of capacitors in the liquid level detecting circuitry to balance the bridge circuitry, allowing for accurate detection even with instruments connected, by dynamically adjusting the capacitance to maintain balanced differential inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If automatic phase shifting circuitry is used to cancel output variations, then output stability is improved, but measurement precision deteriorates when instruments are connected
Solution Approach 1:
The patent applies dynamics by making the capacitance values adjustable rather than fixed. The capacitance adjusting circuitry dynamically changes the capacitance of the first and second capacitors based on the connection status of instruments, allowing the bridge circuitry to maintain balance under varying conditions. This resolves the contradiction by enabling the system to adapt its parameters (capacitance) to preserve both stability and precision simultaneously.
Solution Approach 2:
The patent implements parameter changes by modifying the capacitance values of the capacitors in the bridge circuitry. When instruments are connected, the capacitance adjusting circuitry alters the capacitance parameters to compensate for the additional capacitance introduced by the instruments, thereby maintaining the balance of the bridge circuitry and preserving measurement precision while keeping output stable.
2Difficulty of detecting and measuring
If bridge circuitry is used for liquid level detection, then detection capability is improved, but device complexity increases due to additional circuit components
Solution Approach 1:
The patent applies universality by designing the capacitance adjusting circuitry to serve multiple functions: it adjusts capacitance for instruments connected to either the first or second differential inputs, maintains bridge circuitry balance, and works with various types of instruments (piercer needles, heaters, etc.). This multi-functional design improves detection capability while minimizing the increase in device complexity by using a single versatile adjustment mechanism.
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 enhances the accuracy of liquid level detection and improves the reliability of tests by effectively absorbing variations caused by instruments like piercer needles and heaters, ensuring precise measurements.
Implementation Method 1
the liquid level is detected based on changes in signal amplitude and signal phase which occur along with a change in impedance due to contact between the probe and the liquid surface
Implementation Method 2
Incorporating a capacitance adjusting circuitry that adjusts the electrostatic capacitance of capacitors in the liquid level detecting circuitry to balance the bridge circuitry
Data Source
AI summary
According to one embodiment, an automatic analyzing apparatus includes a probe and a liquid level detector. The liquid level detector is electrically connected to the probe and detects contact between the probe and a liquid surface, wherein the liquid level detector comprises an adjuster configured to adjust electrostatic capacitance of one or more capacitors for circuitry for use in liquid level detection.