T-Connection Multiplexing for Hazardous-Area Vibration Sensors
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Solution Overview
Problem
Existing vibration sensor systems in hazardous areas face challenges with complex and costly cable connections, interference issues, and reduced accuracy due to additional components, especially in explosive atmospheres, requiring sequential switching and additional components that can introduce interference and delay.
Innovation Solution
A multiplexing multiport system using a T-connection structure with a central control module and interchangeable control and signal functions, allowing sensors to be connected in any order, minimizing wiring and interference by combining control and measurement lines, and using a T-type interconnection structure for distributed multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration sensors are connected via collective junction boxes or full cable bundles to measurement cabinets, then signal transmission is achieved, but the complexity of the connection system and cable cost increase significantly
Solution Approach 1:
The system divides the connection architecture into distributed T-connection nodes along the measurement line, where each node can independently connect sensors or continue the signal path. This segmentation replaces the centralized complex junction box/bundle approach with multiple simple T-connection points, reducing overall system complexity while maintaining reliable signal transmission to all sensors.
Solution Approach 2:
The patent introduces a spatial dimension to the connection system by allowing T-connections at multiple points along the measurement line rather than requiring all sensors to connect to a single centralized point. This distributed arrangement along the length of the measurement line reduces cable complexity and makes the system more adaptable to different sensor placements.
2Reliability
If measurement cabinets are located outside hazardous areas, then safety is improved, but the distance to monitored machines increases requiring more wiring
Solution Approach 1:
The measurement system is segmented into multiple T-connection nodes distributed along the measurement line, allowing the cable to be tapped at various points for sensor connections. This eliminates the need for a single long cable running directly to a centralized cabinet, as each T-node creates a local connection point that reduces the effective cable length required while maintaining the cabinet's safe location outside hazardous areas.
3Adaptability or versatility
If additional process value sensors are added to the system, then monitoring capability is improved, but installation complexity and interference resistance decrease
Solution Approach 1:
The T-connection structure provides a universal connection method that works for all sensor types (vibration sensors and process value sensors like temperature). Each T-node can accommodate different sensor connections using the same basic architecture, allowing multiple sensor types to be added without increasing installation complexity. The standardized T-connection interface makes the system universally adaptable to various monitoring needs.
4Device complexity
If sequential switching multiplexing is used, then the number of measurement paths is reduced, but sensor connection flexibility is limited
Solution Approach 1:
The system uses dynamic T-connections that can be selectively activated or deactivated based on which sensors need to be monitored. Unlike fixed sequential switching, the T-connection architecture allows flexible configuration where any combination of sensors can be connected to active measurement paths. This dynamic adaptability enables the system to accommodate changing monitoring requirements without being constrained by fixed switching sequences.
Data Source
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AI summary
The subject of the invention is a multiplexing multiport, a measuring system and a method for reading measured signals from vibration sensors using a T-type connection structure, especially in hazardous area applications. The multiplexing multiport (2), for cascade connection of measuring sensors (21, 31) to a measuring device via a measuring line, includes the main connector A of the multiplexing multiport (2) connected to the control module (1') and to the first end of the switch (2'), with the remaining at least one lead of the switch (2') being connected to one of at least two secondary connectors (B, C), the control module (1') being connected to the switch (2'). The measuring system (1), includes a measuring device connected by a signal line wire to the main connector of at least one multiport (2, 3) and is connected to at least two measuring sensors (22, 33). The measuring system includes, between the measuring device and the at least one multiplexing multiport, a control module (11) and a control line (14, 24, LC) connecting the control module to the at least one multiplexing multiport (2, 3).