ATEX Sensor Communication Module With Short-Circuit Disconnect
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Solution Overview
Problem
In ATEX zones, existing leak detection systems face challenges with high-power communication signals causing explosions, limiting cable length and energy consumption, and necessitating the use of power-limited signals and Zener barriers.
Innovation Solution
A communication module with a short-circuiting mechanism that disconnects sensors from the communication wire after data exchange, reducing energy consumption and release, and using a repeater to progressively retransmit signals, allowing for longer detection device lengths without increasing energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power of the communication signal is increased to ensure good communication with all sensors including the furthest sensor, then communication quality is improved, but the risk of explosion increases due to high-power signals releasing energy through the Joule effect in ATEX zones
Solution Approach 1:
The patent implements periodic action by having each sensor sequentially connect to the communication wire for a brief period to exchange data, then disconnect. This time-division multiplexing approach allows communication with multiple sensors using low power signals, as each sensor is active only during its designated time slot rather than continuously, thereby maintaining communication quality while preventing explosion risks from high-power continuous signals
Solution Approach 2:
The control means at each sensor performs preliminary actions by automatically connecting to the communication wire upon detecting an address signal, exchanging data in advance, and then automatically disconnecting. This preliminary connection and disconnection sequence ensures that each sensor is only powered during the brief moment needed for communication, preventing continuous high-power signal transmission that could cause explosions while ensuring communication readiness when needed
2Object-affected harmful factors
If the power of the communication signal is limited to prevent explosions in ATEX zones, then explosion risk is reduced, but the length of the detection cable is limited
Solution Approach 1:
The patent applies segmentation by dividing the detection device into multiple independent sensor units distributed along the communication wire. Each sensor unit operates independently, connecting sequentially to the wire for brief periods to exchange data. This segmentation allows the system to support long cable lengths with multiple sensors while maintaining low power operation, as each segment (sensor) is activated only when needed rather than the entire system requiring continuous high-power signaling
Solution Approach 2:
The sequential, periodic activation of individual sensors along the communication wire enables low-power operation while supporting extended cable lengths. Each sensor activates periodically only during its designated communication slot, allowing the system to scale to longer cables with more sensors without requiring proportionally higher power levels, thus resolving the contradiction between cable length and power limitation
3Quantity of substance
If multiple sensors are connected in series to a single communication wire, then the number of sensors is increased, but the energy consumption during communication operations increases
Solution Approach 1:
The patent implements periodic action by having each sensor connect to the communication wire only during its designated time slot for data exchange, then disconnect and remain inactive. This time-division approach allows multiple sensors to be connected in series while maintaining low overall energy consumption, as each sensor consumes power only briefly during its active communication period rather than continuously, enabling the system to support a large number of sensors without proportionally increasing total energy usage
Solution Approach 2:
By segmenting the communication process into discrete time slots assigned to individual sensors, the system allows multiple sensors to share a single communication wire with low energy consumption. Each sensor segment operates independently during its assigned slot, eliminating the need for continuous high-power signaling across all sensors simultaneously, thus enabling high sensor quantity with controlled energy usage
4Length of stationary object
If multiple sensors are connected in series to a single communication wire, then the detection device length is increased, but the energy released by the detection device increases due to Joule heating
Solution Approach 1:
The periodic activation of individual sensors along the extended detection device ensures that each sensor is powered only during its brief communication window. This time-division approach allows the detection device to be extended to cover larger areas with more sensors while maintaining low energy release, as the cumulative power consumption remains low since not all sensors are active simultaneously but rather sequentially in brief intervals
Solution Approach 2:
Segmenting the detection device into independently controllable sensor units that activate sequentially rather than simultaneously allows for extended device length without proportional increases in energy release. Each segment (sensor) contributes minimally to total energy consumption during its brief active period, enabling the system to scale to longer detection devices while keeping Joule heating and overall energy release within safe limits
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
This solution enables efficient, low-energy communication with sensors, reducing the risk of explosions and allowing for longer detection device lengths and more sensors without energy constraints, suitable for ATEX areas.
Implementation Method 1
high-power signals can cause explosions due to the energy released by the Joule effect
Data Source
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AI summary
The invention relates to a communication module (100) for a sensor, designed to be used in a detection device, in particular for leakage detection, comprising a plurality of sensors, characterized in that it comprises: - at least one means (102, 104), termed upstream, for receiving an interrogation signal from upstream of said sensor and transporting it to the sensor, and receiving from said sensor a response signal and transporting it to upstream of the sensor; - at least one means (106), termed downstream, for transporting an interrogation signal to downstream of said sensor; - at least one means (110), termed sensor short-circuit, displaceable between an open position in which the upstream means (102) is linked to the sensor, and a closed position in which the upstream means (102) is disconnected from the sensor and connected to the downstream means (106); and - at least one means (112), termed control means, for controlling said short-circuit means (110) and arranged so as to maintain said short-circuit means (110): - in the open position until the emission of the response signal, and - in the closed position after said emission. It also relates to a sensor comprising such a module, a communication circuit comprising such modules, a detection device comprising such sensors and a method of communication used in such a device.