This is an INPUT DEVICE specifically designed to detect a rapid rise of temperature in a protected area. It is also triggered when a specific temperature is reached. HEAT DETECTORS come in three main [..]

Speech Transmission Index - a measure of a sound system’s intelligibility.

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When measuring sound pressure levels, this scale on the meter most closely resembles the response of the human ear.

Refers to a method of signal transmission to a qualified central monitoring station in which communication between the premises fire alarm communicator and the station receiver is continuously supervi [..]

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