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Most conventional fire systems are designed to work with two pairs of wires per zone: one pair for detection devices such as smoke detectors, heat detectors and manual call points; the other for alarm devices such as bells, sounders or strobes. By using different voltage bands for quiescent and alarm states, AlarmSense® components can be connected to the same pair of supply wires.

When powered and controlled by the AlarmSense® two-wire fire panel, this reliable technology takes all the complexity out of fire alarm system design, leading to quicker, less expensive and more flexible installation. Research shows an AlarmSense® two-wire system can achieve up to 40% reduction of labour over a standard four wire conventional system.


  • Designed to comply with EN54 parts 2 and 4
  • Installer-friendly design accommodates easy first fix and straightforward maintenance
  • Attractive flush or surface mountable plastic lid and enclosure
  • Auxiliary remote, fire, fault and reset outputs
  • ‘Class change’ and alert inputs
  • Four conventional sounder circuits (for use with non-AlarmSense® sounders)
  • Low quiescent current - for extended standby times with small batteries.
  • Intuitive user-friendly interface.
  • Multiple indicators provide a comprehensive overview of system status.
  • Push button access code or keyswitch entry (dependent on model purchased) to a wide range of Engineering functions, including:
    • Selectable zone delay facility
    • Zone test facility
    • Coincidence (double-knock) facility
    • Non-latching zones facility
    • Comprehensive fault diagnostic facilities
    • System expansion connections for up to eight two-wire repeater panels and a range of Relay Output Cards


The AlarmSense® range comprises:

  • Optical smoke detector
  • Integrating optical smoke detector
  • Two heat detectors
  • Mounting base
  • Manual call point
  • Sounder base
  • Sounder beacon base
  • Alarm relay module

The sounder base is capable of local and general alarms while the sounder beacon base enables compliance with the Disability Discrimination Act (DDA).


The entire range has been designed to enable compliance with BS 5839 Parts 1 and 6, EN54-5 and 7 for heat and smoke detectors, EN54-3 for the sounder base and sounder beacon base while the alarm relay complies with EN54-18.


  • The range offers many benefits to the installer and end user including:Local and general alarm switching
  • Reduced wiring costs
  • Quick and simple installation
  • False alarm reduction with "non-priority" signalling
  • Flexible system design
  • RemovAlert head removal monitoring
  • SynchroPulse technology for alarm synchronisation
  • Failsafe operation of manual call points
  • Detector and call points are identifiable and separately

Don't forget, AlarmSense® systems comply with BS 5839 Part 1 making it ideal for sites where mixed systems are required such as Houses in Multiple Occupation (HMOs). For more information on using AlarmSense® in HMOs, request a copy of Apollo's new Application Guide PP2260.


AlarmSense® sounders and manual call points are fitted to the same zone as detectors. In quiescent state the zone is powered at between 9 and 15 volts, nominally 12 volts, at which voltage only detectors and call points operate. Sounders require 24V to operate.

When an alarm is detected on a particular zone, the control panel increases the line voltage to 24V on that zone, causing the sounders to produce a continuous ‘Evacuate' sound. Any voltage-sensitive output devices- relay modules or other alarm devices-also operate.

When the voltage is increased to 24V, the detector alarm current will reduce to 1.5mA. The detectors are latched in alarm until they are reset by reducing the voltage to less than 2V for greater than 1 second. Output devices will de-activate each time the voltage is reduced to 12V unless otherwise stated in their specification.

On other zones, where detectors have not changed to the alarmstate, generation of the ‘Alert' tone can be achieved by pulsing the supply voltage from 12V to 24V with Line 1 positive and the sounders configured to continuous output. Pulse frequency is determined by the control panel but a frequency of 1 second on, 1 second off, is recommended for compliance with BS 5839 Pt1.

CHAS/2 AlarmSense 2 zone control panel
CHAS/4 AlarmSense 4 zone control panel
CHAS/8 AlarmSense 8 zone control panel
CHBG/S/AS AlarmSense break glass unit (surface mounted)
CHSM/P/AS AlarmSense optical smoke detector c/w base
CHHF/AS AlarmSense fixed temperature heat detector (60) c/w base
CHHR/A/AS AlarmSense rate of rise heat detector c/w base
CHWB/D/AS AlarmSense Base mounted electronic sounder (87-70db) 5mA
CHWB/D/BN/AS AlarmSense Base mounted electronic sounder/beacon (87-70db) 5mA
CHRL/AS AlarmSense zone powered relay (resets on silence) 2 x 1A 30v rated contacts

Detailed documentation

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