Mobile Sensor Calibration Circuit With Continuous Desalination
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Solution Overview
Problem
Calibration, verification, and adjustment of sensors for determining process variables are complicated by the need for thorough cleaning to prevent contamination and require complex handling of calibration liquids, especially for sensors sensitive to salt content, often necessitating computational correction for temperature dependence.
Innovation Solution
A mobile system with a conveying circuit, including a fluid line, bypass line with a filter unit for desalination, pump, and adjustable valve unit, allows for setting the process variable to specifiable reference values without cleaning, enabling continuous desalination and maintaining sensors in contact with calibration liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are calibrated using multiple calibration standards with different salt concentrations, then measurement precision is improved, but device complexity and cleaning requirements increase
Solution Approach 1:
The system dynamically adjusts the salt concentration of calibration liquid by controlling the mixing ratio between fresh calibration liquid and recirculated liquid through a pump and control unit, eliminating the need for multiple static calibration standards and complex cleaning procedures
Solution Approach 2:
The system changes the concentration parameter of the calibration liquid in real-time by adjusting the mixing ratio of fresh calibration liquid and recirculated liquid, enabling multi-point calibration with a single liquid source and avoiding contamination issues
2Measurement precision
If sensors are thoroughly cleaned between calibration steps, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The system maintains continuous circulation of calibration liquid through the sensor and recirculation line, allowing sequential calibration steps without interruption or cleaning, thus eliminating time loss while maintaining precision through controlled concentration variations
Solution Approach 2:
The recirculated calibration liquid acts as an intermediary that carries the sensor through different calibration points without requiring physical cleaning, serving as a continuous medium that enables rapid sequential calibration
3Manufacturing precision
If calibration liquids are handled manually, then ease of operation is reduced, but manufacturing precision can be maintained
Solution Approach 1:
The system automatically controls the calibration liquid concentration and circulation through an integrated pump and control unit, eliminating the need for manual handling while maintaining precise concentration control, thus improving both ease of operation and precision
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, on-site calibration of sensors with high sensitivity to salt content, reducing measurement inaccuracies and eliminating the need for complex cleaning, while achieving high accuracy and simplicity in setting multiple reference values.
Implementation Method 1
a filter unit (5), which is configured for continuous desalinization of a portion of the calibration liquid conveyed through the bypass fluid line
Data Source
AI summary
The present disclosure includes a mobile system for calibrating, verifying and/or adjusting a sensor, the mobile system having a valve unit, wherein by setting, in particular controlling, the valve unit, the process variable present at a calibration site can be set, in particular controlled, to at least one specifiable reference value for the process variable. The present disclosure further includes a method for calibrating, verifying and/or adjusting a sensor by means of the mobile system.