Advertisement
Page 64
Function
General
The BE1530/BE1550 Bellman Visit 868 Smoke Alarm is a radio transmitter within the Bellman Visit 868 System for
indoor use, which detects smoke. When smoke is detected, the Smoke Alarm will transmit a fire alarm signal to all
Bellman Visit 868 receivers which are within its range.
Bellman Visit Smoke Alarms are activated by smoke detected by a built-in smoke detector. There are two types of
smoke detector: optical (BE1530) and ionising (BE1550).
The differences between the two types are explained briefly below:
• Ionising smoke alarms measure electrical resistance in the air and will therefore react to both visible and invisible
smoke. Ionising smoke alarms are considered most useful for detecting rapid (or explosive) fires that burn completely,
i.e. fires with open flames and a supply of oxygen. This type of fire can spread quickly and produce a large number of
invisible combustion particles. Such fires include fires in waste paper baskets, TV fires or grease fires in kitchens.
• The optical smoke alarm contains no radioactive material but has a very advanced photocell system, which detects
visible smoke particles using infrared light. This is a very effective system for detecting smouldering fires. A fire can
burn for several hours without developing into a fire with open flames. Examples of such fires include cigarettes
touching furniture or overheated electric cables.
The majority of international investigations have demonstrated that both optical and ionising smoke alarms are
needed to detect fires in the shortest possible time, regardless of cause. The majority of countries therefore recommend
that either both types of smoke alarm, or combined smoke alarms with both ionic and optical detectors, be installed.
This is of course the best alternative, as it will detect a fire as soon as possible, regardless of the cause. For example, a
cigarette lying in a waste paper bin will cause an explosive fire in a very short length of time, whilst a cigarette resting
on a sofa will cause a smouldering fire that takes longer to burn.
Radio Key
On delivery all Bellman Visit 868 units are tuned to the same Radio Key. If you have a neighbour with a similar
system, you can change to different Radio Keys so that you do not affect each other's systems. If you use the Radio
Key Switch (5) to change the Radio Key on this transmitter, you must also change all other units in your Bellman
Visit 868 System to the same Radio Key. Refer to the user manual for the relevant unit.
Broadcasting
All Bellman Visit 868 products within the same system
must be tuned to the same Radio Key in order to operate
as a group.
On delivery the Bellman Visit 868 Smoke Alarm is set to only transmit signals to systems which are set to the same
Radio Key as the Smoke Alarm.
By changing the broadcast switch (6) to ON, the operation of the Smoke Alarm can be changed so that it transmits
the smoke alarm signal to all Bellman Visit 868 receivers within its range regardless of the Radio Key that is set.
Note that the battery warning signal is only transmitted to receivers with the same Radio Key as the Smoke Alarm
regardless of the broadcast key setting.
Indicators and Signals
System indicators
The LED (2) blinks red when the Bellman Visit 868 Smoke Alarm indicates an alarm.
Power supply
The LED (2) blinks red approximately once per minute to indicate that the Bellman Visit 868 Smoke Alarm is
working correctly.
Be1530/Be1550
Please note:
Technical Solutions
Bellman Visit System Information
Hide quick links:
Advertisement
