Fuel Tank Sensor Network Intrinsic Safety Verification
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Solution Overview
Problem
Conventional sensing device networks for monitoring fuel storage tanks are complex and costly due to the need for multiple intrinsic safety barriers, extensive cabling, and significant operator interaction, which increases installation time and labor, and poses risks if not properly configured.
Innovation Solution
A sensing device arrangement that uses a single bi-directional data line for communication between controllers and sensing devices, employing a multi-drop configuration and asynchronous protocol to reduce cabling and operator configuration, with automatic verification of intrinsic safety barrier compliance to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sensing device networks use individual dedicated barriers and cabling for each sensing device, then intrinsic safety is maintained, but device complexity and installation cost increase significantly
Solution Approach 1:
Multiple sensing devices are merged into a single intrinsic safety barrier domain through daisy-chain connection. The barrier monitors and controls the cumulative electrical characteristics (capacitance, inductance, resistance) of all devices on the shared circuit, eliminating the need for individual barriers per device while maintaining intrinsic safety through centralized electrical parameter monitoring and control.
Solution Approach 2:
The intrinsic safety barrier is enhanced with microprocessor-based electrical characteristic monitoring that enables it to serve multiple sensing devices simultaneously. The barrier universally manages electrical parameters across the entire daisy-chained network, providing both power supply and safety monitoring functions for multiple devices through a single barrier unit.
2Reliability
If conventional networks use extensive cabling and dedicated connections for each sensing device, then reliable data transmission is achieved, but installation labor and expense increase
Solution Approach 1:
Multiple sensing devices are connected in a daisy-chain configuration using minimal cabling. Each device connects to the next through simple wire links, forming a single continuous electrical path that shares power and data transmission resources, dramatically reducing the total amount of cabling required compared to dedicated point-to-point connections.
Solution Approach 2:
The patent replaces complex mechanical cabling arrangements with electrical field-based communication and power distribution. Electrical signals carry both power and data through the shared circuit, eliminating the need for separate physical conduits for each device and simplifying the mechanical installation infrastructure.
3Adaptability or versatility
If operators manually configure each sensing device in conventional networks, then device parameters can be customized, but operator errors and configuration time increase
Solution Approach 1:
Sensing devices automatically provide their electrical characteristics (capacitance, inductance, resistance values) to the intrinsic safety barrier through the shared circuit. The barrier's microprocessor automatically reads, stores, and validates these parameters without requiring manual operator input, enabling the system to self-configure while maintaining adaptability through automatic parameter recognition and validation.
Solution Approach 2:
The intrinsic safety barrier continuously monitors electrical parameters from sensing devices and provides automatic feedback validation. The system compares measured electrical characteristics against predefined safety thresholds and device specifications, automatically detecting configuration errors and preventing unsafe operations without requiring manual operator verification.
4Reliability
If conventional systems require manual calculation of total capacitance and inductance for intrinsic safety verification, then safety compliance can be checked, but calculation errors may go undetected
Solution Approach 1:
The patent replaces manual mathematical calculations with automated electronic measurement and microprocessor-based computation. The intrinsic safety barrier directly measures total circuit capacitance and inductance through electrical testing and uses microprocessor algorithms to compute compliance, eliminating human calculation errors and providing precise, repeatable safety verification.
Solution Approach 2:
The system implements continuous feedback monitoring of electrical parameters against intrinsic safety limits. The microprocessor automatically compares measured capacitance, inductance, and resistance values against maximum allowable values, providing real-time compliance verification and automatic alarm or shutdown if limits are exceeded, ensuring continuous safety validation without manual intervention.
Data Source
AI summary
A sensing device arrangement for a fuel storage system is provided having at least one storage tank (40a-40d), a plurality of sensing devices (58a-58f, 60a-60d, 62a-62h) positioned in or around the at least one storage tank, and a controller (50) in electrical communication with the plurality of sensing devices (58a-58f, 60a-60d, 62a-62h). The controller (50) is configured to communicate with each sensing device of the plurality of sensing devices (58a-58f, 60a-60d, 62a-62h) on a single bi-directional data line (72c, 74c). A sensing device of the plurality of sensing devices (58a-58f, 60a-60d, 62a-62h) is activated by the controller (50). Data is acquired by the sensing device and transmitted to the controller (50) over the data line (72c, 74c). The controller instructs the sensing device to change to a low power state. The controller (50) receives electrical characteristics from the plurality of sensing devices (58a-58f, 60a-60d, 62a- 62h) recognized on the data line (72c, 74c) and calculates a characteristic of the sensing device arrangement. The controller (50) verifies compliance with an intrinsic safety barrier.