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Honeywell Gent - Fire Sensor Application Guide & System Design

System Design - Detector Selection - Siting - Voice Alarm - Loudspeakers

System Design - System Category & Selection

The general steps for the designer are:

  • Ensure the Fire Risk Assessment is complete
  • Confirm level of protection or system category is correct (listed below)
  • Confirm the 'Cause & Effect'
  • Agree any 'Variations' with all relevant parties
  • Complete the specification drawings
  • Sign off the Design Certificate required within BS 5839-1:2017

System Categories are fully described within BS 5839-1:2017 and vary depending on the Risk. These are commonly referred to as Category M, L5, L4, L3, L2 or L1 or Life protection of P1 or P2 for Property protection.

Below is a small portion of advice taken from notes associated with one of the Approved CPD training seminars that relate specifically to fire detection design.

Detector Selection & Siting

Selection and siting of sensors (for further advice please refer to Clauses 21 and 22 of BS 5839-1:2017)

The objective is to select the correct sensor for the appropriate application, to provide the earliest warning of fire without the risk of a false alarm. It is therefore worth trying to visualise the type of fire that is likely to occur in a particular room or area and to familiarise oneself with the application and the risks that could give rise to a false alarm.

It should also be remembered that a Vigilon system can incorporate a whole range of different sensors using S-Quad multi-sensors. These can be set up for different applications and can be switched from ‘state to state’ should particular risks be present for short periods of time. This should be read in conjunction with the application / risk charts.

To download our free S-Quad Selector Mobile App for iPhone, iPad and Android devices, please go to www.gent.co.uk

Obviously, conditions may vary depending on the particular application and if there are any doubts, please contact Gent for further consultation.

Voice Alarm (VA) & Public Address (PA)

Voice messages are more effective than tone signals alone.

Research has shown in an alarm situation (EN 54 Part 16):

  • 13% of people react in timely manner to bell tones
  • 75% of people reacted quickly to a voice message explaining the nature of the emergency

In addition to this, it was found that people will naturally use the entrance they used to enter the building to leave even if it is not the closest.

The newly harmonised EN 54 Part 16 defines the specific functionality of the VA equipment and applies to any component that is part of the core functionality of VA. Our rack system is now certified as a complete unit, so the new standard means it is no longer possible to build a system using components from third party suppliers.

EN 54 Part 24 covers the minimum requirements for loudspeakers and the method for testing their operational performance. Acoustic requirements for loudspeakers vary according to the nature of the space where they are installed, so many projects may involve at least one application where there is a need to employ specialist design support.

Honeywell Gent will provide FREE advice on Fire Detection and Voice Alarm system design recognising the responsibilities imposed on the Designer. This is available through our Network of Approved System Integrators. The service our Sales Support Team can offer is:

  • Fire detection design & application advice
  • Voice alarm design
  • Acoustic design & modelling using the Ulysses tool
  • Central battery & static inverter design, sales support & commissioning
  • Aspirating design & application support
  • Factory acceptance testing
  • Site survey & application support
  • Site training


Honeywell Gent’s range of Voice Alarm Loudspeakers is a key element of the complete Voice Solution. Certified to EN 54 Part 24 you can be sure to meet the demands of any system and comply with the design requirements of BS 5839 Part 8.

Click the PDF image to view the technical information in full

Fire Sensor

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