Automatic Fire Alarm Calls Protocol¶
Merseyside Fire & Rescue Service. (2013). Automatic Fire Alarm Calls Protocol: Appendix A, MF&RS Definition of Double Knock Alarm System.
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1 citation across 1 artifact.
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Mechanisms¶
- Modulatory Release Gate
- Instead a release gate applies coincidence detection, sometimes called "double-knock": the general-alarm modulator is released only when two independent detectors in a zone agree, or one detector plus a confirming signal, and even then it is scoped to the affected zones before escalating building-wide.
This sourceDefines a double-knock alarm as withholding transmission to the fire service until two system notifications are received, and describes this as coincidence detection.
- Instead a release gate applies coincidence detection, sometimes called "double-knock": the general-alarm modulator is released only when two independent detectors in a zone agree, or one detector plus a confirming signal, and even then it is scoped to the affected zones before escalating building-wide.
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