xx
     
   
   
 
 

Technical Index - Guide Index - Page 1 - Page 2 - Page 3 - Page 4 - Page 5

Optical and Ionisation Detectors

Situation / Location
Suitable
Detector Type
Comments
Bedrooms (Hotel, Hospital incl Wards)
OPTICAL
A Smouldering Fire is more likely to exist due to bedding and furniture.
NB: However, if smoking is permitted
in Hotel Rooms then Ionisation detectors would be less prone to unwanted alarms. Care must be taken in respect of the location of the detector.
Cargo Handling Area
OPTICAL
The presence of dust and air currents could present problems with Ionisation. Beam Smoke Detectors should be considered for large, open and/or high areas.
Churches (Chapels)
BOTH
Both types are suitable. Consideration must be given on the contents within the building, ie: smouldering fires = optical
Flame Fire = Ionisation.
Corridors/Passages
OPTICAL
PREFERRED

IONISATION
ACCEPTABLE
As air currents exist in these areas, and of a building, optical are preferred to detect visible smoke.
Data Processing Areas
incl: Telephone Exchanges
BOTH
A smouldering Fire is more likely to occur due to many cables with PVC covering. However, consideration must be given to all room contents in respect of which type of fire is more likely to occur and the possible use of high sensitivity sampling systems for rapid response.
Conference Rooms
BOTH
In general, Smoke Detection should be utilised but consideration should be given to the proposed use of the room and the possibility of smoke build up when in use. Rate of Rise Heat Detectors may be considered in place of Smoke Detectors - take note of the different spacing requirements.