Skip to content

Smoke Detectors 2-Wire Fire Alarm Systems

2 Wire Smoke Detectors 2-Wire conventional smoke circuits use a pair of wires for both power and signalling functions. On 2-wire circuits, the detectors are wired in parallel along a single path with an EOL resistor at the end of the circuit. When any detector goes into alarm, the circuit is brought to a near short. The panel senses the change and goes into alarm.

2-Wire systems can often show a cost saving on installation due to the reduction in cabling.

Filters

  • Apollo 55000-390APO AlarmSense Optical Smoke Detector - SD Fire Alarms
    £13.50
     -
    £13.50
    £13.50
    £13.50
     -
    £13.50
    £13.50

    Apollo 55000-390APO AlarmSense Optical Smoke Detector

    Apollo

    AlarmSense is a range of conventional fire detection and alarm products designed to be connected to the same pair of supply wires, making installat...

    View full details
    £13.50
     -
    £13.50
    £13.50
    £13.50
     -
    £13.50
    £13.50
  • £18.50
     -
    £18.50
    £18.50
    £18.50
     -
    £18.50
    £18.50

    Apollo AlarmSense Integrating Optical Smoke Detector 55000-391APO

    Apollo

    The AlarmSense Optical Smoke Detector works using the light scatter principle. The detector also has the ability to monitor and discard transient s...

    View full details
    £18.50
     -
    £18.50
    £18.50
    £18.50
     -
    £18.50
    £18.50
  • £28.03
     -
    £28.03
    £28.03
    £28.03
     -
    £28.03
    £28.03

    Apollo AlarmSense Integrating Optical Smoke Detector Inc Sounder 55000-393APO

    Apollo

    The AlarmSense Optical Smoke Detector works using the light scatter principle. The detector also has the ability to monitor and discard transient s...

    View full details
    £28.03
     -
    £28.03
    £28.03
    £28.03
     -
    £28.03
    £28.03
  • £0.00
     -
    £0.00
    £0.00
    £0.00
     -
    £0.00
    £0.00

    Apollo AlarmSense 2-Wire Optical Smoke Detector Inc Sounder Base 55000-392

    Apollo

    The AlarmSense Optical Smoke Detector works using the light scatter principle. The detector changes to alarm state at a pre-set threshold of smoke ...

    View full details
    £0.00
     -
    £0.00
    £0.00
    £0.00
     -
    £0.00
    £0.00