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When using two-tone or DTMF, the siren has to be "armed" in order to operate (unless programmed not to). To do this a DTMF arm string would first be broadcast to the controller, then a signal DTMF string would be broadcast. Arm period would last for 5 minutes until automatic disarm, unless a "disarm" DTMF string was broadcast before the time ...
The sirens are tested on the first workday of April and November every year to see if they are functioning properly. On 2 June every year, the day of Hristo Botev and demised ones for the liberation and independence of Bulgaria is commemorated with a 2-minute signal, different from the usual tone. The public is informed about the test beforehand.
In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.
Severnside Sirens Trust Limited is the organisation responsible for maintaining the system. It is a registered company (number 3348008) and charity (number 1063224) [5] and was incorporated on 9 April 1997. [6]
The Federal Signal 3T22 was originally designed as the 2T22 in 1952 or 1954. The 2T22 has the same number of ports and cones. It can produce two main signals (it can produce more but the other signals are rarely used), hence the name "2T22" (the 2 at front representing the 2 choppers, and the 22 representing the amount of horns).
Priority 2 represents an Urgent call. Use of lights authorised and siren allowed only when passing through heavy traffic and clearing intersections. (Response time target is to attend to 90% of urgent calls within 25 minutes) Priority 3 represents a Non-urgent call. (response time target is to attend to 90% of non-urgent calls within 60 minutes) ..
The majority of audible notification appliances installed prior to 1996 produced a steady sound for evacuation. In general, no common standard at that time mandated any particular tone, or pattern for audible fire alarm evacuation signals. While less common than a steady sound, differing signaling methods were used for the same purpose.
The Model 2 features a 2 HP universal motor powering a single-tone 5-port chopper motor, which was also used on the Thunderbolt 1000, another siren once made by Federal Signal. It can produce 3 signals at 102 dBC: Alert (Steady) Attack (Wail) Fast Attack (Fast Wail) The Model 2 is 25.5 inches tall by 12 inches wide, and weighs 68 lbs.
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