Field Device Dielectric Insulation for Cathodic Current Isolation
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Solution Overview
Problem
Industrial process field devices are vulnerable to electrical currents from cathodic protection schemes, which can damage their electronics, and existing insulation methods are inadequate for protecting these devices effectively.
Innovation Solution
The implementation of a dielectric insulation system using ceramic materials, anodized layers, or plastic overmolds in gaskets and bolt spacers to insulate field devices from electrical currents, ensuring effective electrical isolation and protection of the device's electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If field devices are coupled directly to cathodic protection schemes, then electrical connection is established, but electronics of the field device are damaged by electrical currents
Solution Approach 1:
The patent introduces a dielectric insulation system comprising a dielectric layer applied to the process interface, which acts as an intermediary between the cathodic protection scheme and the field device electronics. This dielectric barrier blocks harmful electrical currents while allowing the field device to remain electrically connected to the process, thereby protecting electronics without isolating the device from its functional connections.
Solution Approach 2:
The insulation system is segmented into multiple components including a dielectric layer on the process interface, insulating gaskets, and insulating bushings. This segmentation allows electrical isolation at specific critical points while maintaining electrical connectivity in other areas where process control functions are needed, enabling selective insulation to protect vulnerable electronics.
2Reliability
If conventional insulation methods are used, then some electrical protection is provided, but insulation is inadequate and electronics remain vulnerable
Solution Approach 1:
The patent employs composite insulation structures combining multiple materials with complementary properties. The dielectric layer is applied over the process interface, and insulating gaskets made from non-conductive materials are used in conjunction with metal flanges and process connections. This composite approach provides superior electrical insulation compared to single-material solutions while distributing the insulation function across multiple components.
Solution Approach 2:
The insulation system uses a nested structure where the dielectric layer is applied directly to the process interface, insulating gaskets are positioned within flange assemblies, and insulating bushings are embedded within process connections. This nested arrangement provides multiple layers of insulation protection without significantly increasing the overall size or complexity of the field device assembly.
3Reliability
If dielectric insulation system is implemented, then electrical protection is enhanced, but manufacturing complexity increases
Solution Approach 1:
The dielectric layer is applied to the process interface during the manufacturing process before final assembly of the field device. Insulating gaskets are pre-positioned within flange assemblies, and insulating bushings are pre-installed in process connections. This preliminary application of insulation components simplifies the final assembly process and ensures proper insulation placement without requiring complex manufacturing operations at the assembly stage.
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 dielectric insulation system effectively prevents electrical interference from cathodic protection systems, enhancing the longevity and reliability of field devices by reducing the risk of electrical damage and maintaining accurate measurements in harsh industrial environments.
Implementation Method 1
A dielectric layer is applied to a process interface of a field device assembly. The dielectric layer includes a ceramic material, an anodized material, or a plastic material. The dielectric insulation system effectively prevents electrical interference from cathodic protection systems
Implementation Method 2
Each of the at least one dielectric layer includes a layer of ceramic material, an anodized layer, or a plastic overmold
Implementation Method 3
The dielectric layer includes a ceramic coating on an exterior surface of the metal body
Data Source
AI summary
An industrial process field device includes a pressure sensor, and a housing containing the pressure sensor. The housing includes a base having a base interface and a first base process opening. A flange is attached to the base and includes a flange interface having a first flange process opening. A first gasket process opening of a gasket is aligned with the first base process opening and the first flange process opening. A first surface of the gasket engages the base interface, and a second surface of the gasket engages the flange interface. A dielectric insulation system includes at least one dielectric layer that insulates the housing from electrical currents conducted through the flange. Each dielectric layer includes a layer of ceramic material, an anodized layer, or a plastic overmold, which improve a maximum working pressure of the field device.