Rotatable Explosion-Proof Connector With Offset Boss Alignment
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Solution Overview
Problem
Process control instruments in hazardous environments require explosion-proof connections that are also rotatable and removable for ease of installation, maintenance, and viewing, but existing technologies do not adequately address these needs.
Innovation Solution
A connector assembly comprising a cylindrical one-piece metal connector body with an offset boss and a swivel mechanism that allows for rotation and secure alignment, along with a cylindrical flame path for explosion-proofing, enabling the transmitter to be removably connected to a process vessel while ensuring proper electrical connection and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed, non-rotatable connection is used to ensure explosion-proof integrity, then safety is improved, but ease of operation for viewing and maintenance deteriorates
Solution Approach 1:
The connector assembly incorporates a rotatable joint mechanism that allows the transmitter housing to be rotated to various angular positions relative to the process adaptor. This dynamic capability enables operators to view displays and access wire compartments from convenient angles while maintaining explosion-proof sealing through specialized gaskets and sealing surfaces that preserve integrity during rotation.
Solution Approach 2:
The connector assembly is divided into separable components including a process adaptor portion, a connector body, and a transmitter housing portion. This segmentation allows the transmitter to be removed for maintenance while leaving the process adaptor in place, and enables rotation of individual sections to optimize viewing angles without compromising the sealed connection interface.
2Reliability
If a permanent, non-removable connection is used to ensure reliability, then connection stability is improved, but ease of repair and installation deteriorates
Solution Approach 1:
The connector assembly features a separable design with distinct mating components that can be connected and disconnected. The process adaptor remains fixed in the process vessel while the transmitter housing with connector can be removed and reinstalled. This segmentation enables easy replacement of transmitters for maintenance or upgrades while maintaining a stable, reliable connection interface through precision-machined mating surfaces and locking mechanisms.
Solution Approach 2:
The connector assembly includes pre-configured sealing surfaces, alignment features, and locking mechanisms that are prepared in advance during manufacturing. These preliminary actions ensure that when the transmitter is installed or reinstalled, the connection achieves immediate explosion-proof integrity and proper alignment without requiring complex field adjustments or procedures.
3Ease of operation
If a complex rotation mechanism is added to enable viewing, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The rotation mechanism is designed with simple, robust components including a rotatable joint with sealing surfaces and minimal moving parts. The design allows smooth rotation to various positions for viewing and maintenance access while avoiding complex gears, motors, or electronic controls. This keeps the device complexity low and maintains reliability in hazardous environments where simple, fail-safe mechanisms are preferred.
Data Source
AI summary
A process measurement instrument comprises a process adaptor for mounting to a process vessel or the like and operatively associated with a sensing element for sensing a process variable and including plural electrical conductors. An instrument housing includes a control circuit. A connector assembly is operatively disposed between the instrument housing and the process adaptor for removably connecting the instrument housing to the process adaptor. The connector assembly comprises a first connector including a cylindrical connector body having an offset boss with a first multi-pin wire connector. A second connector includes a cylindrical connector housing, receiving the cylindrical connector body, having an offset bore, receiving the offset boss, and having a second multi-pin wire connector, mateable with the first wire connector, for selectively electrically connecting the control circuit to the sensing element with the offset boss and offset bore ensuring proper alignment of the first and second multi-pin wire connectors.