Wireless Process Adapter Silicone Potting for Hazardous Locations
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Solution Overview
Problem
Industrial process plants face challenges in integrating wireless communication adapters for field devices without compromising explosion-proof or intrinsic safety ratings, and achieving a compact design that meets hazardous location approval standards.
Innovation Solution
A wireless process communication adapter with a metal housing, radio-frequency transparent radome, and silicone potting that encapsulates electronics, providing an explosion-proof barrier and intrinsic safety while allowing miniaturization through specific adhesion and foam cushioning to manage thermal expansion and component protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explosion-proof enclosure is used to contain explosions, then safety is improved, but device size and complexity increase
Solution Approach 1:
The adapter incorporates an explosion-proof barrier nested within the housing structure, creating a contained chamber that isolates potentially explosive elements while maintaining a compact overall device form factor
2Reliability
If intrinsically-safe design with spaced components is used, then safety is improved, but circuit board size and device volume increase
Solution Approach 1:
A potting material is introduced as an intermediary substance that fills the spaces between circuit board components, providing electrical isolation and arc prevention necessary for intrinsic safety while allowing compact component spacing and minimizing overall device volume
3Adaptability or versatility
If wireless communication adapter is added to field devices, then communication capability is improved, but form factor and space requirements increase
Solution Approach 1:
The wireless communication adapter integrates multiple functions including wireless transceiver, power management, and field device interface into a single compact unit that attaches to existing field devices, eliminating the need for separate components and reducing overall form factor
4Reliability
If explosion-proof barrier is provided at device connection, then safety is improved, but manufacturing complexity increases
Solution Approach 1:
The explosion-proof barrier utilizes the inherent pressure-containing properties of potting material by controlling its curing parameters and physical properties, transforming a potentially complex mechanical barrier design into a simpler material-based solution that maintains safety while easing manufacturing
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 wireless communication for field devices while maintaining compliance with hazardous location approvals and minimizing the device's form factor, ensuring reliable and safe operation in explosive environments.
Implementation Method 1
A silicone potting fills all of the volume within the chamber not occupied by the at least one circuit board and wireless process communication circuitry
Implementation Method 2
A radio-frequency transparent radome is coupled to the first end
Implementation Method 3
Inner surfaces of the metal housing have mold-release applied thereto
Data Source
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AI summary
A wireless process communication adapter (14, 30) for field devices (12) is provided. The adapter (14, 30) includes a metal housing (120) having a first end and a second end. A chamber (130) is defined between the first and second ends. A radio-frequency transparent radome (124) is coupled to the first end. The second end has a field device coupling (123) configured to attach to a field device (12). At least one circuit board (132, 134) is disposed within the chamber (130). The circuit board (132, 134) supports at least wireless process communication circuitry (154). A plurality of wires (158, 160) is coupled to the at least one circuit board (132, 134) and extends through the field device coupling (123). A silicone potting (136) fills substantially all volume within the chamber (130) not occupied by the at least one circuit board (132, 134) and wireless process communication circuitry (154).