5
SENSOR TECHNOLOGY
Thermoptek technology combines the very
latest in optical sensing with a thermal
enhancement providing a fast reaction to
both fast flaming and slow smouldering
fires in a single alarm. Thermoptek
technology constantly monitors
for temperature change. If a rate of
temperature rise is detected the sensitivity
of the smoke alarm is increased, providing
a quicker response time to both fire types.
Heat alarms are designed for areas where
dust and fumes may trigger frequent
nuisance alarms in conventional smoke
alarms - ideal for attics, garages and
kitchens. The HT-230 / WHT-230 are fixed
point heat alarms. All alarms are approved
to class A1 and will activate when the
temperature reaches a preset range of
54 °C to 65 °C.
APPLICATION
SYSTEM GRADES AND CATEGORIES
The mains powered FireAngel Pro alarms
with 10 year life are suitable for Grade D1
systems. It is important to determine the
correct alarm system grade and category
for the dwelling prior to installation.
A grade D system is required for:
• New or materially altered dwellings, up
to three storeys with no floor exceeding
200 m
2
.
• Existing dwellings with poor or
inadequate fire protection, up to three
storeys with no floor exceeding 200 m
2
.
• Individual dwelling units of two or more
rooms in Houses in Multiple Occupation
(HMOs) of one or two-storeys, with no
floor exceeding 200 m
2
.
There are three Levels of Detection (LD).
Generally the greater the fire risk the more
comprehensive the system should be.
LD1 = The highest level of protection of all
occupants who might occupy the dwelling
over the lifetime of the fire detection and
fire alarm system. A system installed
throughout the premises, incorporating
detectors in all circulation areas that form
part of the escape routes from the premises,
and in all rooms and areas, other than those
with negligible sources of ignition, such as
toilets, bathrooms and shower rooms.
LD2 = A system incorporating detectors in
all circulation areas that form part of the
escape routes from the premises, and in
all specified rooms or areas that present a
high fire risk to occupants, including any
kitchen and the principal habitable room.
LD3 = A system incorporating detectors in
all circulation areas that form part of the
escape routes from the premises.
Ensure that a Grade D system is adequate
for the dwelling you are installing the
alarms in.
For further information, refer to British
Standard BS5839-6 or contact your local
Fire Brigade or Building Control.
