Conductivity Sensor for High-Pressure Pump Leak Detection
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Solution Overview
Problem
Conductivity sensors for high-pressure and high-temperature applications in diaphragm pumps face challenges in withstanding harsh environments and effectively detecting leaks in hygienic applications.
Innovation Solution
A conductivity sensor with platinum electrodes embedded in a cylindrical non-conductive body, supported by a fluid-tight attachable structure, designed for high-pressure and high-temperature conditions, integrated into a membrane assembly within a high-pressure pump to detect leaks by measuring conductivity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conductivity sensor is placed in a high-pressure pump chamber to detect leaks, then leak detection capability is improved, but the sensor must withstand extreme temperature and pressure conditions which increases device complexity and reliability challenges
Solution Approach 1:
The sensor is segmented into distinct functional components: electrodes for conductivity measurement, a non-conductive body for structural support and electrical insulation, and a support body for mechanical attachment. This segmentation allows each component to be optimized for its specific function while collectively withstanding the harsh pump environment.
Solution Approach 2:
A non-conductive body acts as an intermediary between the electrodes and the high-pressure fluid environment. This intermediary structure protects the electrodes from direct exposure to extreme conditions while still allowing them to detect conductivity changes in the surrounding fluid for leak detection.
2Measurement precision
If four concentric electrodes are used for conductivity measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Multiple electrodes are merged within a single non-conductive body structure, which provides unified mechanical support and electrical insulation for all electrodes. This merging approach maintains the precision benefits of multiple electrodes while reducing overall structural complexity compared to separate electrode assemblies.
Solution Approach 2:
The non-conductive body serves multiple functions simultaneously: it provides structural support for the electrodes, acts as an electrical insulator to prevent short circuits between concentric electrodes, and withstands the high-pressure and high-temperature pump environment. This multi-functionality reduces the need for additional protective components.
3Reliability
If the sensor is designed to withstand high pressure and temperature, then reliability in extreme conditions is improved, but manufacturing complexity increases
Solution Approach 1:
The material properties of the non-conductive body are selected and designed to withstand extreme temperature and pressure parameters. By choosing materials with appropriate thermal and pressure resistance characteristics, the sensor achieves reliability in harsh pump conditions while maintaining manufacturability through standard material selection processes.
Solution Approach 2:
The sensor employs a composite structure combining conductive materials (electrodes) with non-conductive, pressure-resistant materials (non-conductive body and support body). This composite approach allows each material to be optimized for its specific requirements while being manufactured as an integrated assembly, balancing durability with manufacturing feasibility.
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 sensor effectively operates in extreme conditions, reliably detecting conductivity changes and preventing hydraulic oil from entering the product chamber, ensuring food safety and reducing operational costs by minimizing product losses and steam usage.
Implementation Method 1
The general principle is based on the fact that the electrical conductivity is a very specific property of fluids. A change in composition or temperature will provide a change in conductivity. Hence, by measuring the conductivity variations within a system may easily be detected.
Data Source
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AI summary
A conductivity sensor is provided. The sensor comprises at least one electrode (410) being embedded in a cylindrical non-conductive body (420) such that one end (412) of each one of the at least one electrode (410) is exposed to a sample volume (430), wherein the sensor further comprises a support body (440) to which the cylindrical body (420) is engagable with, which support body (440) comprises means (442) for attaching said support body (440) to a frame structure (320) in a fluid tight manner.