Reagent Dilution via Conductivity Feedback Control
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Solution Overview
Problem
Existing reagent preparation devices fail to accurately dilute high-concentration reagents to desired concentrations when the properties of the dilution liquid vary, leading to inconsistent reagent concentrations.
Innovation Solution
A reagent preparation system that uses conductivity sensors and temperature sensors to calculate a target electrical conductance value for diluting high-concentration reagents, ensuring precise dilution by adjusting the amount of dilution liquid based on real-time measurements, even when the dilution liquid's properties change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If previously obtained electrical conductance values from experiments are used to calculate pump operation frequency, then the reagent preparation device can operate automatically, but the dilution accuracy deteriorates when the dilution liquid properties vary from experimental conditions
Solution Approach 1:
The patent implements a feedback mechanism where the actual electrical conductance of the dilution liquid is measured in real-time, and this measured value is used to dynamically adjust the pump operation frequency. The control unit calculates the pump frequency based on the ratio between the target electrical conductance value and the actual measured value, ensuring accurate dilution even when dilution liquid properties vary from experimental conditions.
Solution Approach 2:
The patent changes the operating parameters of the pump dynamically based on the measured electrical conductance of the dilution liquid. Instead of using a fixed pump frequency based on experimental data, the system adjusts the pump frequency in real-time according to the actual electrical conductance values, allowing accurate dilution despite variations in dilution liquid properties.
2Device complexity
If fixed pump operation frequency based on experimental data is used, then the device structure can be simplified, but the reagent concentration precision deteriorates when dilution liquid properties change
Solution Approach 1:
The control unit uses feedback from the electrical conductance sensor to dynamically adjust pump operation frequency. The system measures the actual electrical conductance of the dilution liquid and calculates the appropriate pump frequency based on the ratio between target and actual conductance values, ensuring precise reagent concentration despite dilution liquid variations.
Solution Approach 2:
The patent transitions from a static, fixed pump frequency system to a dynamic system where the pump frequency is continuously adjusted based on real-time measurements of dilution liquid electrical conductance. This dynamic adaptation allows the system to maintain precise reagent concentration control even when dilution liquid properties change.
3Productivity
If the pump adds dilution liquid in large amounts, then the preparation time can be reduced, but the concentration control precision deteriorates
Solution Approach 1:
The patent implements periodic, stepwise addition of dilution liquid by the pump rather than continuous large-volume addition. The control unit calculates appropriate pump operation frequencies and controls the pump to add dilution liquid in controlled increments, allowing concentration monitoring and adjustment between additions. This periodic action enables both reasonable preparation time and precise concentration control.
Solution Approach 2:
The electrical conductance sensor provides continuous feedback during the dilution process, allowing the control unit to adjust the pump operation frequency between additions of dilution liquid. This feedback mechanism ensures that each periodic addition brings the reagent concentration closer to the target value without overshooting, maintaining precision while progressing toward completion.
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 system ensures that high-concentration reagents are consistently diluted to the desired concentration, reducing errors and improving the reliability of reagent preparation, especially when using reverse osmosis water as the dilution liquid.
Implementation Method 1
a first conductivity sensor SE3 detecting an electrical conductance of the dilution liquid
Implementation Method 2
a first temperature sensor SE4 measuring a temperature of the dilution liquid
Implementation Method 3
especially when using reverse osmosis water as the dilution liquid
Data Source
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AI summary
A sample analysis system includes a reagent preparation unit and a measurement unit. The reagent preparation unit has: a state detection unit which detects at least one of a state of the reagent preparation unit and a state of the reagent preparation; and a transmission unit which transmits the detected state information to a computer arranged outside the reagent preparation unit. The computer displays the received state information on a display.