Conductive Polymer Coated Leak Detection Cable

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Solution Overview

Problem

Existing aqueous chemical leak detection systems are prone to false positives and corrosion, especially in environments with high humidity or the presence of metal objects, due to the sensitivity of conventional materials and sensor configurations.

Innovation Solution

Aqueous chemical leak detection cable featuring a non-conductive polymer base with interstices housing sensor cables coated with conductive polymer, which are twisted to expose periodically and create a conductive path while protecting against corrosion, using a helix configuration to prevent false detections and corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional sensor materials and configurations are used in aqueous chemical leak detection systems, then the sensors can detect leaks, but they are prone to false positives and corrosion in high humidity environments or when exposed to metal objects

Engineering Contradiction:

Improvedetection accuracyVSAvoidcorrosion and false positives

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent employs a composite structure consisting of a non-conductive polymer base member combined with conductive polymer-coated sensor cables. This composite material approach allows the sensor to detect aqueous chemicals through conductivity changes while the non-conductive base protects against false positives from metal objects and corrosion from humidity, directly resolving the technical contradiction between detection capability and environmental susceptibility

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The non-conductive polymer base member acts as an intermediary between the sensor cables and the external environment. It provides mechanical support and positioning while electrically isolating the sensor system from harmful external factors such as metal objects and corrosive humidity, enabling reliable detection without false positives or corrosion

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If sensor cables are exposed to detect leaks, then detection sensitivity increases, but the sensor wires become vulnerable to corrosion from aqueous chemicals

Engineering Contradiction:

Improveleak detection sensitivityVSAvoidsensor wire corrosion

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies different material properties to different parts of the sensor system: the sensor cables are coated with conductive polymer to maintain electrical conductivity for detection, while the base member is made of non-conductive polymer to provide corrosion resistance. This local differentiation of material qualities allows the sensor wires to remain sensitive to leaks while being protected from corrosion through the conductive polymer coating

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the electrical conductivity parameter of the polymer coating on the sensor cables, transforming it from non-conductive to conductive through specialized coating materials. This parameter change enables the coating to simultaneously protect the sensor wires from corrosion while allowing electrical signal transmission for leak detection

Inventive Principle:

Principle #35Parameter changes

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 solution effectively detects aqueous chemical leaks while minimizing false alarms and protecting the sensor wires from corrosion, ensuring accurate and reliable leak detection.

Implementation Method 1

detecting the presence of the aqueous chemicals on the surface whenever the aqueous chemicals create a conductive path between the sensor cables

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

a conductive polymer coating that is resistant to corrosion by the aqueous chemicals... protects the sensor wires from corrosion

Methodology Applied

Scientific EffectCorrosion resistance:

Implementation Method 3

twisting the base member so that the sensor cables are exposed to the surface along a length of the aqueous chemical leak detection cable

Methodology Applied

Scientific EffectHelical geometry: Helix

Data Source

PatentUS8256269B2Aqueous chemical leak detection cable

Publication Date: 2012.09.04 PARAMETER LLC

AI summary

Disclosed are aqueous chemical leak detection cables that provide protection to sensor wires by using a conductive polymer coating that is resistant to corrosion by aqueous chemicals. In addition, non-conductive, liquid pervious layers may surround one or more of the sensor wires to assist in preventing false detection of a aqueous chemical leak as a result of various non-liquid contaminants. The non-conductive, liquid pervious layer may comprise braided, non-hydroscopic, non-conductive fibers, or a continuous, non-conductive pervious coating.