Fire Alarm System
A fire alarm system warns people when smoke, fire, carbon monoxide or other fire-related emergencies are detected. These alarms may be activated automatically from smoke detectors and heat detectors or may also be activated via manual fire alarm activation devices such as manual call points or pull stations. Alarms can be either motorized bells or wall mountable sounders or horns. They can also be speaker strobes which sound an alarm, followed by a voice evacuation message which warns people inside the building not to use the elevators. Fire alarm sounders can be set to certain frequencies and different tones including low, medium, and high, depending on the country and manufacturer of the device. Most fire alarm systems in Europe sound like a siren with alternating frequencies. Fire alarm electronic devices are known as horns in the United States and Canada and can be either continuous or set to different codes. Fire alarm warning devices can also be set to different volume levels.
Oxford (/ˈɒksfərd/) is a city in England. It is the county town and only city of Oxfordshire. In 2017, its population was estimated at 152,450. It is 56 miles (90 km) northwest of London, 64 miles (103 km) southeast of Birmingham, and 61 miles (98 km) northeast of Bristol. The city is home to the University of Oxford, the oldest university in the English-speaking world, and has buildings in every style of English architecture from late Anglo-Saxon. Oxford's industries include motor manufacturing, education, publishing, information technology and science.