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Sounder Tones - Standard

1st Tone 2nd Tone Type Frequencies Temporal Pattern Typical Application
1 14 Alternating 800 & 970 2Hz (250ms-250ms) BS Fire tone
2 14 Sweep 800 to 970 7Hz (7/s) BS Fire tone
3 14 Sweep 800 to 970 1Hz (1/s) BS Fire tone
4 14 Continuous 2850 Steady General purpose
5 4 Sweep 2400 to 2850 7Hz General purpose
6 4 Sweep 2400 to 2850 1Hz General purpose
7 14 Slow whoop 500 to 1200 3.5s sweep, 0.5 s silence, then repeat Dutch tone (NEN 2575)
8 14 Sweep 1200 to 500 1Hz Din tone (33 404)
9 4 Alternating 2400 & 2850 2Hz (250ms-250ms) General purpose
10 14 Intermittent 970 0.5Hz (1s On/1s Off) PFEER alert
11 14 Alternating 800 & 970 1Hz (500ms-500ms) BS Fire tone
12 4 Intermittent 2850 0.5Hz (1s On/1s Off) General purpose
13 14 Intermittent 970 0.8Hz (250ms On/1s Off) General purpose
14 14 Continuous 970 Steady PFEER Toxic-gas
15 14 Alternating 554 & 440 100ms-400ms French fire tone
16 16 Intermittent 660 3.3Hz (150ms On/150ms Off) Swedish (Air raid)
17 17 Intermittent 660 0.28Hz(1.8s On/1.8s Off) Swedish (Local warning)
18 18 Intermittent 660 0.05Hz (13s Off / 6.5Hz On) Swedish (Pre-mess)
19 19 Continuous 660 Steady Swedish (All clear)
20 20 Alternating 554 & 440 0.5Hz (1s On/1s Off) Swedish (Turn out)
21 21 Intermittent 660 1Hz (500ms-500ms) Swedish tone
22 14 Intermittent 2850 4Hz (150ms On/100ms Off) Pelican crossing
23 14 Sweep 800 to 970 50Hz BS Fire tone
24 4 Sweep 2400 to 2850 50Hz General purpose
25 25 Intermittent 970 3 x 500ms pulses followed by 1.5s silence then repeat ISO 8201 / Australia
26 26 Intermittent (1) 800 to 970 3 x 500ms pulsed sweep followed by 1.5s silence then repeat ISO 8201 / Australia
27 27 Intermittent (1) 970 & 800 3 x 500ms pulsed two tone followed by 1.5s silence then repeat ISO 8201 / Australia
28 10 Alternating 800 & 970 2Hz (250ms-250ms) BS Fire tone
29 33 Alternating 990 & 650 2Hz (250ms-250ms) (Symphoni tones) BS Fire tone
30 35 Alternating 510 & 610 2Hz (250ms-250ms) (Squashni Micro tones) BS Fire tone
31 14 Sweep 300 to 1200 1Hz General purpose
32 35 Alternating 510 & 610 1 Hz (500mS-500mS) BS Fire tone
33 (1) Continuous 990 Steady BS Fire tone
34 (1) Intermittent 990 1Hz (500ms On/500ms Off) BS Fire tone
35 (1) Continuous 510 Steady BS Fire tone
36 (1) Intermittent 510 1Hz (500ms On/500ms Off) BS Fire tone
37 (1) Continuous 850 Steady BS Fire tone
38 (1) Continuous 2650 Steady General purpose

(1) Product dependant.