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 Zone Alarms - Simplex, Edwards, Notifier fire alarms. Single and multiple zone alarms circuits and system design. National fire alarm code, fire alarm inspection, equipment, installers, manufacturers and fire alarm training.
Burglar and Fire Security Alarm Systems - Links to burglar alarm systems and fire alarm systems.
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Single Zone Alarm. Single zone fire alarm circuit diagram and description. This contrasts with a multiple zone alarm where there are two or more zones. A single zone alarm has only one zone.
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A single zone alarm circuit with entry and exit delay
and other facilities. Please refer to the diagram below.
The circuit features automatic exit and entry delays, timed bell cut-off and system reset. It has provision for normally open
and normally closed switches and will suit the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs
and Inertia Sensors). When the power is applied, if there's a fault the buzzer of the Single Zone Alarm will sound and you should switch off again and
check for open doors, windows, etc. If everything is in order the buzzer will NOT sound and the exit delay will begin. You
have about 30 seconds to leave the building. When you return the buzzer will sound. You then have about 30 seconds to
switch off; otherwise the siren will sound. It will go on sounding indefinitely. However, if the building is re-secured the siren
will switch off after about 10 minutes and the alarm will reset.
The Exit delay, Entry delay and Bell Cut-off times can be changed by altering the values in the Single Zone Alarm of R4, R12 & R13 respectively. Q5
and Q6 ensure that the Entry delay and Bell cut-off timers always start with C7 either fully charged or fully discharged as
required. If you can live with slightly less precise time intervals then leave out Q5, Q6, R14, R15, R16, R17, C8 & C9. If you
don't want a Bell Cut-off at all then leave out D3 as well.
The sensitivity of the Inertia Sensors is adjusted by R8 of the Single Zone Alarm. Set to minimum value, a light tap will activate the alarm. Set to
maximum value, a heavy blow is required. If you are not using Inertia Sensors then replace R8 with a 27k fixed resistor. If
you are not using normally open switches then leave out R1, C1 & Q1 and fit a link between R2 and C2 of the Single Zone Alarm.
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Multiple Zone Alarm - A more complex type of fire alarm enbling the source of a fire to be pinpointed to one of several zones rather than a single zone alarm.
 CMOS Single Zone Alarm - Circuit diagram and description of burglar alarm for single zone
The most relevant links we could find, placed here free
 Quicksafe
- ESP Infinite Alarm, Logisty Wirefree Alarm, Pet Friendly Alarms and more. www.quicksafe.co.uk
Single Zone Alarm
www.mitedu.freeserve.co.uk
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Zone Alarms
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Site written by John Middlemas, Ian King, & Pascal Walls