Amperometric Sensor Cross-Sensitivity Correction via Control Unit
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Solution Overview
Problem
Existing analytical measurement technologies, such as amperometric sensors, face cross-sensitivity issues when measuring multiple disinfectants like chlorine and chlorine dioxide, making it impossible to accurately determine the correct concentrations of both substances simultaneously due to interference from each other.
Innovation Solution
A method involving a control unit connected to three analytical measuring devices, including a first sensor for measuring free chlorine, a second sensor for measuring chlorine dioxide, and a third sensor for measuring pH, which calculates corrected values by accounting for cross-sensitivity coefficients and dependencies on pH values to isolate and compensate for interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a first analytical measuring device measures a first measurand (e.g., chlorine) and a second analytical measuring device measures a second measurand (e.g., chlorine dioxide), then both measured values can be obtained, but cross-sensitivity causes both devices to be influenced by the other measurand, making accurate measurement impossible
Solution Approach 1:
The invention uses the measured values from both the first and second analytical measuring devices as feedback to calculate correction values. The control unit processes both measured values together with their respective cross-sensitivity coefficients to determine corrected measured values, eliminating the need for external correction sources and enabling accurate measurement despite mutual interference
Solution Approach 2:
The control unit acts as an intermediary that receives measured values from both sensors, applies cross-sensitivity coefficients, and calculates corrected values. This intermediary processing step separates the interference effects mathematically, allowing the system to extract accurate measurements from the cross-sensitive sensor data
2Measurement precision
If a second sensor is used to compensate for the cross-sensitivity of a first sensor to a second analyte, then the cross-sensitivity of the first sensor can be corrected, but the cross-sensitivity of the second sensor to the first analyte cannot be compensated
Solution Approach 1:
The invention merges the correction processes for both sensors into a single unified calculation performed by the control unit. By combining the measured values from both sensors and applying both cross-sensitivity coefficients simultaneously, the system achieves mutual compensation where both measured values are corrected for their respective cross-sensitivities in one integrated process
Solution Approach 2:
The control unit performs multiple functions: it processes measurements from both sensors, applies both cross-sensitivity coefficients, and outputs two corrected measured values. This multi-functional approach enables the system to compensate for cross-sensitivity in both directions, making the measurement system universally applicable to both analytes despite mutual interference
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
Enables accurate correction of measured values for both free chlorine and chlorine dioxide concentrations, overcoming the limitations of single-sensor compensation and achieving interference-free measurement of multiple analytes.
Implementation Method 1
Amperometric sensors comprise at least two electrodes, one of which serves as a working electrode and one as a counter electrode. The respective measurand is determined on the basis of a current flow through the working electrode.
Implementation Method 2
Amperometric sensors comprise at least two electrodes, one of which serves as a working electrode and one as a counter electrode. The respective measurand is determined on the basis of a current flow through the working electrode.
Implementation Method 3
a third analytical measuring device which is suitable for determining a third measured value of a third measurand that differs from the first and the second measurands
Implementation Method 4
calculating a corrected first measured value by means of the control unit by taking into account the first measured value, the second measured value, the cross-sensitivity of the first analytical measuring device to the second measurand, and compensating for the dependence of the first measured value on the third measured value
Data Source
AI summary
Disclosed is an apparatus for determining a process variable of a medium in a containment, comprising first and second oscillatory elements, first and second driving/receiving units, and electronics. The first driving/receiving unit is embodied to excite the first oscillatory element using a first electrical excitation signal to execute mechanical oscillations, and to receive the mechanical oscillations of the first oscillatory element and to convert such into a first electrical, received signal, wherein the second driving/receiving unit is embodied to excite the second oscillatory element by means of a second electrical excitation signal to execute mechanical oscillations, and to receive the mechanical oscillations of the second oscillatory element and to convert such into a second electrical, received signal, and wherein the electronics is embodied to determine the process variable from the first received signal and/or the second received signal.