| Summary: | Fire alarm is one of the important safety equipment at home. In Indonesia,
there were four family members of different ages have different hearing abilities in
one house. So that, it takes various intensity detection.
This study used three factors: the type of alarm, age, and place. Alarm type
is divided into intermittent, sweep, and alternating while age categories divided into
children, adults, and seniors. Place factor is for adults between resident and
laboratories. Response used is just noticeable intensity in dB, response time, and
number of running. Noise movie is set at 70 dB and reception distance is 1.9 times
television diagonal. Movie is chosen as background noise. Total of 10 people from
each age category is used as a respondent. The method used is transformed up-down
method with two positive responses and two negative responses.
Alarm T-3 which are easily detected for residential fire alarm is intermittent
type with a minimum level of 42.75 dB. The response time required to detect
intermittent alarms in children is 2.31 seconds, 2.13 seconds for adults, while
seniors are 2.59 seconds. Intermittent type which has a square pattern can provide
a sense of discomfort and disturbance effects on the listener. The older a person the
ability to hear is declining, so is in giving response. In addition, seniors often do
errors when the concentration is divided so that the number of required running is
increase. Differences of place in the study having no significant effect on the
response.
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