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Sound the Lunch Whistle

Low Voltage Signal Devices

The advantage of a low voltage system is the ability to use low cost bell wire. It also allows for surface mounting (without conduit) resulting in an easier installation and lower labor cost. All products are commercial rated for long life.

When choosing a signal device several factors need to be considered. Usually better sound distribution is achieved by carefully positioning a number of smaller signals throughout an area than by centrally locating a large single device. The frequency of the device should be as different from the ambient noise as possible. Horns ands bells can better be heard over most ambient conditions. The area to be covered and ambient noise level must be taken into account. Generally speaking the signal device should be at least 6dB higher than the ambient level. Mounting is also a factor, wherein a horn or bell should be rigidly mounted to a sturdy surface, but a buzzer can sound much louder if mounted to hollow wall that acts as a sounding board. A difference of only 3db doubles the loudness e.g. a sound at 71db is twice as loud as at 68dB. Distance from the sound source diminishes the sound 6 dB for each doubling of the distance e.g. 103db @ 10 ft. = 97db @ 20 ft. = 91dB @ 40 ft.