Tone table
| Version | Frequency | Repetition rate | Special application | |
|---|---|---|---|---|
| Alternating tones at 2 Hz (Tone 1 sound) | 800-1000 | 0.25 s/0.25 s |  | UK, BS5839-1 (fire alarm/ level crossing) |
| Alternating tones at 2 Hz (Tone 2 sound) | 2500-3100 | 0.25 s/0.25 s |  | |
| Alternating tones at 4 Hz (Tone 3 sound) | 800-1000 | 0.125 s/0.125 s |  | UK, BS5839-1 (fire alarm, increased urgency/ level crossing) |
| Alternating tones at 4 Hz (Tone 4 sound) | 2500-3100 | 0.125 s/0.125 s |  | |
| Alternating tones at 2 Hz (Tone 5 sound) | 440-554 | 0.4 s/0.1 s |  | France, AFNOR NF S 32-001 (fire alarm) |
| Alternating tones at 1 Hz (Tone 6 sound) | 430-470 | 0.5 s/0.5 s |  | |
| Alternating tones at 7.69 Hz (Tone 7 sound) | 800-1000 | 0.13 s/0.13 s |  | |
| Alternating tones at 14.28 Hz (Tone 8 sound) | 2500-3200 | 0.07 s/0.07 s |  | |
| Alternating tones at 0.5 Hz (Tone 9 sound) | 440-554 |  | SS 031711 (alarm, shutdown) | |
| Continuous note (Tone 10 sound) | 700 |  | Sweden, SS 031711 (all clear) | |
| Continuous note (Tone 11 sound) | 1000 | | UK, PFEER (gas alarm) | |
| Alternating tones at 0.16 Hz (Tone 12 sound) | 20420-1635 | 0.31 s/0.31 s |  | |
| Continuous note (Tone 13 sound) | 2300 | | ||
| Continuous note (Tone 14 sound) | 440 | | ||
| Interrupted tone at 0.5 Hz (Tone 15 sound) | 1000 |  | UK, PFEER (general alarm) | |
| Interrupted tone at 0.8 Hz (Tone 16 sound) | 420 |  | Australia, AS 1610, AS 1670, AS 2220 | |
| nterrupted tone at 2 Hz (Tone 17 sound) | 1000 |  | ||
| Interrupted tone at 4 Hz (Tone 18 sound) | 2500 |  | Australia, AS 1610, AS 1670, AS 2220 | |
| Interrupted tone at 2 Hz (Tone 19 sound) | 2500 |  | ||
| Interrupted tone at 0.057 Hz (Tone 20 sound) | 700 | 6.5 s on/13 s off |  | Sweden, SS 031711 (important message (pre-alarm)) |
| Interrupted tone at 1 Hz (Tone 21 sound) | 1000 | 0.5 s on/0.5 s off |  | UK, PFEER (general alarm) UK BS5839-1 (back-up alarm) |
| Interrupted tone at 0.25 Hz (Tone 22 sound) | 700 | 2 s on/2 s off |  | Sweden, SS 031711 (air alarm) |
| Interrupted tone at 4 Hz (Tone 23 sound) | 700 | 0.125 s on/0.125 s off | | Sweden, SS 031711 (emergency signal) |
| Interrupted tone at 1 Hz (Tone 24 sound) | 700 | 0.7 s on/0.3 s off |  | Germany (industrial alarm) |
| Interrupted tone at 4 Hz (Tone 25 sound) | 1400 | 0.1 s on/0.1 s off |  | |
| Siren at 11.765 Hz (Tone 26 sound) | 250-1200 | 42.5 ms rising, 42.5 ms falling |  | |
| Siren at 0.0166 Hz (Tone 27 sound) | 1000 | 0 to 1000 Hz, 10 s rising, 40 s constant, 10 s falling |  | Germany (industrial alarm) |
| Alternating tones at 1 Hz (Tone 28 sound) | 800-1000 | 0.4 s tone 1/0.4 s tone 2/ 0.2 s pause |  | ISO 8201 Evacuation, international evacuation alarm |
| Siren at 6.6 Hz (Tone 29 sound) | 500-1000 |  | ||
| Siren at 0.22 Hz(Tone 30 sound) | 500-1200 |  | ||
| Siren at 1 Hz (Tone 31 sound) | 1200-500 |  | ||
| Siren at 0.33 Hz (Tone 32 sound) | 500-1200 |  | ||
| Continuous tone (Tone 33 sound) | 500 | | Germany KTA 3901 (all-clear signal) IMO, Code 2 (Low) | |
| Continuous tone (Tone 34 sound) | 660 | | Sweden, SS 031711 (all-clear signal) | |
| Continuous tone (Tone 35 sound) | 800 | | IMO, Code 2 (High) | |
| Continuous tone (Tone 36 sound) | 1200 | | ||
| Continuous tone (Tone 37 sound) | 1300 | | ||
| Continuous tone (Tone 38 sound) | 2000 | | ||
| Interrupted tone at 1 Hz (Tone 39 sound) | 420 | 0.5 s on/0.5 s off | | Australia, AS 1670 |
| Interrupted tone at 5 Hz (Tone 40 sound) | 470 | 0.1 s on/0.1 s off |  | |
| Interrupted tone at 1 Hz (Tone 41 sound) | 544 | 0.5 s on/0.5 s off | | |
| Interrupted tone at 0.5 Hz (Tone 42 sound) | 544 | 1 s on/1 s off | | |
| Interrupted tone at 0.8 Hz (Tone 43 sound) | 800 | 0.25 s on/1 s off |  | |
| Siren at 0.18 Hz (Tone 44 sound) | 560-1055 | 2.73 s/2.73 s |  | |
| Siren at 1 Hz (Tone 45 sound) | 660-1200 | 0.5 s/0.5 s |  | |
| Siren at 7 Hz (Tone 46 sound) | 800-1000 | 0.07 s/0.07 s |  | |
| Siren at 7 Hz (Tone 47 sound) | 2400-2900 | 0.07 s/0.07 s | | |
| Siren at 1 Hz (Tone 48 sound) | 1200-500 | 0.5 s/0.5 s |  | UK, PFEER P.T.A.P Germany DIN tone 33404-3 (emergency signal) EN 54-3 |
| Interrupted tone at 0.5 Hz (Tone 49 sound) | 1000 | 1 s on/1 s off |  | UK, PFEER (general alarm), UK BS5839-1 (back-up alarm) |
| Siren at 1 Hz (Tone 50 sound) | 1400-1600 | 1 s rising/0.5 s falling |  | France, AFNOR, NFC48-265 |
| Siren at 0.25 Hz (Tone 51 sound) | 500-1200 | 3.75 s/0.25 s |  | Australia, AS 2220 (evacuation alarm) |
| Siren at 1 Hz (Tone 52 sound) | 1500-500 | 0.5 s/0.5 s 3 x + 1 x pause (1 s) |  | Australia, AS 4428 (evacuation tone) ISO 8201 |
| Siren at 0.33 Hz (Tone 53 sound) | 500-1500 | 2 s + pause (1 s) |  | Australia, AS 4428 (alarm tone) ISO 7731 |
| Siren at 0.26 Hz (Tone 54 sound) | 500-1500 | 3.5 s + pause (0.5 s) |  | The Netherlands, NEN 2575 (evacuation alarm) |
| Interrupted tone at 0.5 Hz (Tone 55 sound) | 1000 | 1 s on/1 s off 7 x + continuous tone |  | IMO Code 1a |
| Interrupted tone at 2 Hz (Tone 56 sound) | 800 | 0.25 s on/0.25 s off |  | IMO Code 3.a (High) |
| Interrupted tone at 1 Hz (Tone 57 sound) | 420 | 0.5 s on/0.5 s off 3 x + 1 x pause (1.5 s) |  | ISO 8201 Temporal |
| Interrupted tone at 1 Hz (Tone 58 sound) | 1000 | 0.5 s on/0.5 s off 3 x + 1 x pause (1 s) |  | ISO 8201 Temporal |
| Siren at 0.54 Hz(Tone 59 sound) | 422-775 | 0.85 s on/1 s off |  | NFPA Temporal |
| Alternating tones at 1 Hz(Tone 60 sound) | 1000-2000 | 0.5 s/0.5 s |  | Singapore |