Specifications

SMOKE & HEAT ALARMS
Frequently Asked Questions
9
This will depend on a number of factors that will differ slightly
according to the type of alarm in use.
The 140 series alarms are supplied with an Alkaline battery which,
dependent on conditions, can provide up to 4 years standby supply,
up to 2 years without mains power.
The 150 series and the 160 series alarms are fitted with rechargeable
Lithium power cells which are continuously charged by the alarm
circuitry. They have a life expectancy greater than that of the Smoke
Alarm, i.e 10 years or more, which eliminates the need for
replacement.
If either, the voltage of the battery falls to a sufficiently low level, or
the internal resistance of the battery reaches a predetermined
state, the alarm unit will emit a warning beep every 40 seconds.
In the case of the 140 series alarms, it is probable that the alkaline
battery in the unit requires replacement. Access to the battery is
gained by removing the alarm from the Easi-fit mounting plate.
The power cells on the 150 and 160 series alarms are not replaceable.
If these units emit a low battery warning beep it is probable that the
mains supply has failed. The cables, fuses etc should be investigated
and the fault rectified. If the beeping continues the alarm may have
a fault and it should be returned for inspection.
Miscellaneous
There is no technical reason why a Smoke or Heat Alarm should not
last up to 10 years, but the actual lifespan will depend to a large
extent on where and how the alarm has been sited, installed and
maintained. The most common cause of alarm failure is due to
contamination of the sensor chamber and/or electronics. In certain
circumstances, even with regular cleaning, contamination can build
up in the smoke sensing chamber causing the alarm to sound.
If this happens the alarm must be returned for servicing or repair.
All manufacturers of smoke alarms recommend that their
products are replaced after 10 years use.
27. How long will
the battery
last?
28. How will I know
if the battery
has failed?
29. How long do
Smoke Alarms
last?