Fire Panel Current Response Calibration Module
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Solution Overview
Problem
Conventional fire systems face challenges in accurately triggering alarm conditions due to variations in current response values among remote units caused by factors like installation, loop length, and degradation over time, leading to potential false alarms or missed alerts.
Innovation Solution
A fire system with a calibration module that polls each remote unit to record and adjust current response values, allowing for a dynamic threshold based on the lowest value plus or minus a predetermined error, ensuring accurate alarm triggering and improved system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed current threshold value is used for alarm triggering, then the system operation is simple, but the system reliability deteriorates due to variations in current response values among remote units
Solution Approach 1:
The system performs preliminary calibration by polling each indicating device to obtain its current response value before normal operation. This advance measurement allows the fire panel to store individual response characteristics and use them for accurate alarm threshold determination, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The system changes the alarm threshold parameter from a fixed value to a dynamic value determined by polling individual indicating devices. The fire panel adjusts the alarm threshold based on the lowest current response value obtained from polling, ensuring accurate detection while accommodating variations in the loop configuration and device characteristics.
2Area of stationary object
If the loop length is increased to cover larger building areas, then the area coverage is improved, but the measurement precision deteriorates due to current degradation over distance
Solution Approach 1:
The system changes the alarm threshold from a fixed value to a dynamic value based on the lowest current response value obtained from polling. This adaptation allows the system to compensate for current degradation over long loop lengths, maintaining measurement precision across large building areas.
3Quantity of substance
If more remote units are added to the loop to increase monitoring coverage, then the quantity of monitored devices is improved, but the device complexity increases due to calibration requirements
Solution Approach 1:
The system enables self-service calibration by automatically polling each indicating device to obtain its current response value. The fire panel performs the calibration process automatically during installation or when devices are added, eliminating the need for manual calibration of each device and reducing overall system complexity despite an increased number of remote units.
4Measurement precision
If manual calibration of each remote unit is performed, then the measurement precision is improved, but the productivity deteriorates due to time-consuming calibration process
Solution Approach 1:
The system performs automatic self-calibration by polling each indicating device through the existing communication loop. The fire panel automatically measures and stores the current response value of each device without requiring manual intervention, maintaining high measurement precision while significantly improving setup productivity.
Solution Approach 2:
The system replaces manual calibration procedures with an automated electronic polling mechanism. Instead of physically adjusting each device, the fire panel electronically queries each indicating device to obtain its current response value, substituting mechanical/manual operations with automated electronic processes that are both precise and efficient.
Data Source
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AI summary
A fire system 10 for a building is provided, the fire system 10 comprising: a fire panel 12 for monitoring the building and activating an alarm; and a plurality of remote units 14, 16, 18 electrically connected to the fire panel 12 in a circuit 20 having a loop configuration. At least some of the plurality of remote units 14, 16, 18 comprise an indicating device 14, 18 for modulating a current in the circuit 20. The plurality of remote units 14, 16, 18 are in communication with the fire panel 12 in a master-slave relationship. The fire panel 12 comprises a calibration module 22 for polling each indicating device 14, 18 to obtain a current response value and for storing said current response values, the current response value of an indicating device 14, 18 being based on the amplitude of the current when modulated by that indicating device 14, 18.