Explosion-Proof Connection Module with Configurable Resistors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing connection modules in explosion-proof areas lack flexibility in providing intrinsically safe supplies for field devices, requiring numerous module variants and complex wiring due to fixed, type-specific input/output modules, which leads to inefficiencies and unwanted heating from protective resistors.
Innovation Solution
A connection module with hardwired resistors in the housing for forming intrinsically safe pairs of field-side and control-side connections, allowing for flexible configurations and current/power limitation, enabling the connection of multiple devices with reduced heat generation and smaller or omitted resistors in input/output modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If type-specific input/output modules with fixed intrinsically safe characteristic values are used, then intrinsic safety for specific field devices is ensured, but flexibility in connecting different field devices is reduced and complex wiring is required
Solution Approach 1:
The connection module provides a universal platform with multiple selectable resistors (e.g., 51Ω, 100Ω, 250Ω, 500Ω, 1kΩ) that can be configured through jumpers to support different field devices (sensors, actuators, positioners, solenoid valves) with varying intrinsically safe requirements, eliminating the need for multiple dedicated modules
Solution Approach 2:
The module allows dynamic reconfiguration of its electrical characteristics through jumper settings on resistors, enabling the same physical module to adapt to different field device types and protection class requirements (e.g., Ex ia, Ex ib) without physical replacement
2Reliability
If multiple type-specific modules are provided for different field devices, then specific intrinsically safe supplies are ensured, but device complexity and wiring complexity increase
Solution Approach 1:
A single connection module design incorporates multiple resistors with different values and jumper configurations to replace numerous specialized modules, reducing the variety of module types from many specific variants to one universal module that can be configured for different applications
Solution Approach 2:
The module internally segments different resistor values and connection configurations to serve different field device types, allowing each functional requirement to be isolated through jumper selection while maintaining a unified physical structure
3Reliability
If protective resistors are installed in modules for current limitation, then intrinsic safety is ensured, but power loss and heating increase
Solution Approach 1:
The module allows selection of different resistor values (51Ω, 100Ω, 250Ω, 500Ω, 1kΩ) through jumper configurations to optimize the balance between current limitation for intrinsic safety and power dissipation, enabling minimal resistance values to be used where appropriate to reduce heating
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 provides high flexibility in connecting field devices and supplies, reduces power loss and heating, and allows for redundant operation of input/output modules without doubling current, enabling universal use with adjustable resistance for intrinsic safety.
Implementation Method 1
The protective resistors installed in the modules also generate a not inconsiderable amount of power, which can lead to unwanted heating
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a connection module for field devices in the explosion-proof realm, comprising a housing that has a plurality of terminals at the controller end which are to be connected to at least one input/output module as well as terminals at the field device end which are to be connected to the field devices. The connection module of the invention is characterized in that the housing includes different resistors which are hard-wired to different terminals at the field device end and/or to terminals at the controller end in order to provide intrinsically safe pairs of terminals at the field device end which have different characteristic values.