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    Current international standards for safety require the installation of an audible warning device in order to attract the attention of the operator and to indicate a dangerous or emergency situation.
    These standards have specific rules regarding the installation of audible warning devices in industrial environments.Two important factors determine the capability of the sound to be heard in any environment:
- the distance between the audible warning device and the operator.
- the existing ambient noise.

    The suitability of an audible alarm for a specific application is determined by its specification,i.e.:
- sound output DECIBEL(dB)
- sound frequency HERTZ(Hz).

    International standards for industrial warning devices have established minimum differential sound output levels that must be complied with.The dB level of the siren must be at least 15 dB higher than that of the measured ambient noise.The siren must,however,have a minimum sound output of 65 dB.The sound frequency of the siren,at the point where the sound output is greetest,must differ as much as possible to the frequency of the ambient noise.Sound frequency,however,must be between 300 and 3000 HZ.
    The use of a PHONOMETER is necessary to measure ambient sound levels,in order to comply with these regulations and to select the most suitable siren.Once this data is available the selection of a siren can be done very simply.
Decibel dB(1m)-Measurement of sound output
    The sound level can be measured but no precise indication exists for the range of the sound.Too many unknown factors affect this value:type of sound,speed and direction of the wind,humidity,fog,rain etc.The data shown in the following table are useful as theoretical indication.
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