Smoke alarms will not detect fire if sufficient smoke does not reach the smoke alarm.
Smoke may be prevented from reaching the smoke alarm if the fire is too far away, for
example, if the fire is on another floor, behind a closed door, in a chimney, in a wall
cavity, or if the prevailing air draughts carry the smoke or heat away. Installing smoke
alarms on both sides of closed doors and installing more than one smoke alarm as rec-
ommended in this leaflet very significantly improve the probability of early detection.
The smoke alarms may not be heard.
The radio link to the supplementary Visit receivers may not work due to interference or
due to the signal being blocked by furniture, renovations etc.
A smoke alarm may not wake a person who has taken drugs or alcohol.
The smoke alarms may not detect every type of fire to give sufficient early warning.
They are particularly ineffective with: fires caused by smoking in bed, escaping gas,
violent explosions, poor storage of flammable rags and/or liquids, (for example petrol,
paint, spirits etc.), overloaded electrical circuits, arson, children playing with matches.
Smoke alarms don’t last indefinitely. We recommend replacement after 10 years as a
precaution.
Limitations of radio signals
The BE1551 Smoke alarm from Bellman & Symfon is very reliable and is tested to high
standards. However, due to its relatively low transmitting power and limited radio range
(required by regulatory bodies) there are some limitations to be considered:
Receivers may be blocked by radio signals occurring on or near their operating fre-
quencies, regardless of the radio settings.
Radio transceiver equipment should be tested regularly, at least weekly. This is to
determine, whether there are sources of interference preventing communication, that
the radio paths have not been disrupted by moving furniture or renovations, and so
generally protect against these and other faults.
This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio and television reception. However, there is no guarantee that interference will
not occur in a particular installation. If this device does cause such interference, which
can be verified by turning the device on and off (by removing the battery) the user is
encouraged to eliminate the interference by one or more of the following measures:
Re-orientate or re-locate the unit.
Increase the distance between the smoke alarm and the device being affected.
Consult the supplier or an experienced radio/television technician.
Technical specifications
Features
Sensor type
Ionization smoke detection
Smoke sensitivity
Meets requirements for BS EN 14604:2005
Audible alarm
Min 85 dB(A) @ 3m (10'), Frequency: 2.6 kHz
Radio connection
Features separate radio module inside the smoke detector
Low battery warning
Relays the alarm signal to all Visit units within radio range
Broadcast function
Transmits the alarm to all other Visit receivers within
range, overriding the radio key settings
Power supply
Battery power
Duracell MN1604 9V alkaline battery
Power consumption
Idle position < 15 μA
Operation time
Minimum 3 years
Radio function
Radio frequency
868.30 MHz
Coverage
Up to 200 m (218 yd.), clear line of sight.
The range is reduced by walls, large objects and other
radio transmitters such as TVs and mobile phones.
Activation
Via the built-in smoke detector
Via the test button
Environmental
For indoor use only
requirements
Operating, transport and storage temperature:
4° to 40° C (39° to 104° F)
Humidity range: 15% to 95% RH (non-condensing)
Regulatory
Complies with the following standards:
requirements
BS EN14604:2005 + AC:2008, EN 55011:2009 + A1:2010,
EN 301 489-1 v1.9.2, EN 301 489-3 v1.4.1,
EN 60601-1-2:2015 (4
th
Edition)
Size and weight
Dimensions:
118
140
42 mm (4.6"
5.5"
1.6")
Weight: 200 g (7 oz.), including battery
36
35
EN
Summary of Contents for VISIT BE1551
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