Measuring corrosion inhibitor concentration in central heating system water
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Solution Overview
Problem
Central heating systems face challenges in maintaining optimal levels of corrosion inhibitors due to dilution and degradation over time, leading to inefficient operation and potential premature boiler failure, with existing monitoring methods being either ineffective or wasteful.
Innovation Solution
A testing device that automatically samples central heating system water, using a piston with integrated valves to isolate the sample, and optical testing apparatus to determine the level of corrosion inhibitors, ensuring correct dosing without excess chemical usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inhibitor chemical is added regularly by rule of thumb, then corrosion protection is maintained, but chemical waste increases and cost rises
Solution Approach 1:
The patent implements a feedback mechanism by using optical sensors to continuously monitor the actual concentration of inhibitor chemical in the heating system water. This measured concentration is then compared against target levels, and dosing is adjusted accordingly - only adding chemical when concentrations fall below thresholds. This closed-loop feedback system replaces the open-loop rule-of-thumb approach, maintaining reliable corrosion protection while eliminating unnecessary chemical addition and waste.
2Measurement precision
If optical measurement is taken continuously, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated sampling and testing device. The piston mechanism combines sampling, sealing, and dispensing functions; the optical measurement system is integrated directly into the sampling chamber; and the dosing mechanism is coordinated with the measurement system. This consolidation achieves continuous precise monitoring without requiring separate complex systems for each function, thereby reducing overall device complexity while maintaining measurement precision.
3Stability of the object's composition
If piston seals sample chamber entrance, then sample isolation improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent introduces a sealing element as an intermediary component between the piston and the sample chamber entrance. This sealing element mediates the connection, providing reliable isolation through its elastic or compliant properties that allow it to conform to slight variations in manufacturing tolerances. The sealing element acts as a buffer that compensates for precision limitations, achieving stable sample isolation without requiring extremely tight manufacturing tolerances on the rigid components.
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 device allows for precise, automated monitoring and dosing of corrosion inhibitors, preventing corrosion while minimizing waste and ensuring efficient system operation by maintaining optimal inhibitor levels.
Implementation Method 1
optical testing apparatus including a light source and a detector, for measuring an optical property of the sample of central heating system water
Data Source
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AI summary
A testing device (10) for testing the level of a selected chemical in central heating system water in a central heating system circuit comprises: a sample chamber (14) for holding a sample of central heating system water to be tested, the sample chamber (14) being connected to the central heating system circuit to allow fluid to pass between the central heating system circuit and the sample chamber (14); means (16) for controlling filling of the sample chamber (14) with central heating system water from the central heating system circuit, and emptying of the sample chamber (14; 10) at least one valve (18) for isolating the sample of central heating system water from the heating circuit during testing; and optical testing apparatus including a light source (20) and a detector (22), for measuring an optical property of the sample of central heating system water isolated within the sample chamber and thereby making a determination as to whether or not the level of (15) the selected chemical in the water is greater than a predetermined threshold level.