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Global Supply Issues

Like many other iindustries, the Fire Alarm and CCTV markets are subject to extended lead times due to global supplies of Electronic Components and Plastics. 

Whiilst we carry large stocks of the most popular equipment, there are some items where we are experiencing longer than normal delivery times. You can be assured that we are doing all we can to miniimise the disruption this can cause.

We recommend that Orders are placed as soon as possible and to enquire if you need us to meet speciific delivery dates. As always, we endeavour to meet our customerrs requirements but recognise there may be some delays and trust you appreciiate this is outside of our control.

Ei100BNX Ionisation Smoke Alarm.

£5.29 Ex VAT
£6.35 Inc VAT


Ionisation Smoke Alarm. Alkaline Battery only

The Ei100BNX Ionisation Smoke Alarm operates on the principle that electrical current flowing between electrodes in the ionisation chamber is altered when smoke particles enter.

The ionisation alarm is sensitive to all domestic fire types but is especially sensitive to fast flaming fires.

The Ei100BNX Ionisation Smoke Alarm is supplied with screw fixings and is simple to install. The battery removed indicator is a very important safety feature of the alarm. If the battery has been removed a pop up warning flag appears and it is not possible to replace the alarm cover until a new battery has been fitted.

The alarm is fitted with a ‘Test’ button to facilitate frequent testing of the alarm.

The sounder will automatically stop sounding when smoke particles are no longer present in the chamber. This is useful in the case of nuisance alarms from cooking fumes etc.

When the battery is nearing its end of life, the alarm will emit a short beep every 40 seconds to indicate that the battery needs replacing.

When the battery is first connected, the alarm may sound for 2 to 3 seconds, this is normal and means that the battery is connected correctly.


  • Battery powered with a 9V Alkaline battery
  • Ionisation chamber sensor, best for fast flaming fires (e.g. clothing)
  • Stand-alone - no wiring required
  • Built-in Test button
  • Piezoelectric horn
  • Battery removed indicator
  • Low battery audible warning
  • Kitemarked to BS EN 14604:2005
  • 5 Year Guarantee


Sensor Type:        Ionisation
RA Source:           Americium-241
Supply Voltage:    9V battery
Horn:                      Piezoelectric
Sound Level:        85 dB(A) at 3 meters
Temperature:       Operating - 0°C to 40°C  /  Storage - 0°C to 35°C (in a dry area)
Humidity Range: 15% to 95% Relative Humidity
Button Test:          Simulates the effect of smoke and checks chamber, electronics and horn
Self Test:              Smoke chamber and battery is automatically tested every 40 seconds
Plastic material:  UL94HB flame retardant
Dimensions:        Product - 140mm x 120mm x 45mm  /  Package - 145mm x 130mm x 50mm
Weight:                 215g (including packaging)
Warranty:              5 year (limited) warranty
Approvals:            Kitemarked to 522831  /  BS EN 14604:2005
Specifications are subject to change.


  • Model: Ei100BNX
  • Shipping Weight: 200gms

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