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Sounder Tones - Industrial

1st Tone 2nd Tone 3rd Tone Type Frequencies Temporal Pattern Typical Application
A1 (2) A14 Alternating 800 & 970 2Hz (250ms-250ms) BS Fire tone
A2 (2) A14 Sweep 800 to 970 7Hz (7/s) BS Fire tone
A3 (2) A14 Sweep 800 to 970 1Hz (1/s) BS Fire tone
A4 (2) A9 Continuous 2850 Steady General purpose
A5 (2) A4 Sweep 2400 to 2850 7Hz General purpose
A6 (2) A4 Sweep 2400 to 2850 1Hz General purpose
A7 (2) A14 Slow whoop 500 to 1200 3s sweep, 0.5 s silence, then repeat Dutch tone (NEN 2575)
A8 (2) A14 Sweep 1200 to 500 1Hz Din tone (33 404)
A9 (2) A4 Alternating 2400 & 2850 2Hz (250ms-250ms) General purpose
A10 (2) A14 Intermittent 970 0.5Hz (1s On/1s Off) PFEER alert
A11 (2) A14 Alternating 800 & 970 1Hz (500ms-500ms) BS Fire tone
A12 (2) A4 Intermittent 2850 0.5Hz (1s On/1s Off) General purpose
A13 (2) A14 Intermittent 970 0.8Hz (250ms On/1s Off) General purpose
A14 (2) A8 Continuous 970 Steady PFEER - Toxic gas
A15 (2) A14 Alternating 554 & 440 100ms-400ms France NFS 32 S 32-001
A16 (2) A14 Intermittent 660 3.3Hz (150ms On/150msOff) Swedish (Air raid)
A17 (2) A14 Intermittent 660 0.28Hz(1.8s On/1.8s Off) Swedish (Local warning)
A18 (2) A14 Intermittent 660 0.05Hz (6.5s On/13s Off) Swedish (Pre-mess)
A19 (2) A1 Continuous 660 Steady Swedish (All clear)
A20 (2) A19 Alternating 554 & 440 0.5Hz (1s On/1s Off) Swedish (Turn out)
A21 (2) A4 Intermittent 660 1Hz (500ms-500ms) Swedish
A22 (2) A4 Intermittent 2850 4Hz (150ms On/100ms Off) General purpose
A23 (2) A14 Sweep 800 to 970 50Hz BS Fire tone
A24 (2) A4 Sweep 2400 to 2850 50Hz General purpose
A25 (2) A14 Intermittent 970 3 x 500ms pulses followed by 1.5s silence then repeat ISO 8201/Australia/US Temporal
A26 (2) A4 Intermittent(1) 800 to 970 3 x 500ms pulsed sweep followed by 1.5s silence then repeat ISO 8201/Australia
A27 (2) A6 Intermittent(1) 970 & 800 3 x 500ms pulsed two tone followed by 1.5s silence then repeat ISO 8201/Australia
A28 (2) A14 Alternating 800 & 970 2Hz (250ms-250ms) BS Fire tone
A29 (2) A14 Alternating 990 & 650 2Hz (250ms-250ms) (Symphoni tones) BS Fire tone
A30 (2) A14 Alternating 510 & 610 2Hz (250ms-250ms) (Squashni Micro tones) BS Fire tone
A31 (2) A14 Sweep 300 to 1200 1Hz General purpose
A32 (2) A3 Continuous Bell Steady General purpose/BS Fire tone
A33 (2) A14 Continuous Bell 3 x 500ms pulses followed by 1.5s silence then repeat Bell / US temporal
A34 (2) A4 Alternating 1000 & 2000 1Hz (500ms-500ms) Singapore
A35 (2) A14 Intermittent 420 pulsed @ 0.625s Australian alert
A36 (2) A14 Sweep 500 to 1200 Sweep 3.75s followed by 0.25s gap Australian evac
A37 (2) A14 Sweep 1400 to 1600 Sweep up 1s, sweep down 0.5s NF C 48-265
A38 (2) A14 Sweep 500 to 1200 Sweep UP & DOWN over 3s Siren
A39 (2) A14 Intermittent 720 0.7s ON, 0.3OFF German ind alarm
A40 (2) A14 Sweep 422 to 775 Sweep for 0.85s, 1s delay, repeat NFPA Whoop
A41 (2) A3 Continuous 470 Steady Horn (USA)
A42 (2) A3 Continuous 370 Steady Air horn (USA)

Tones 1 & 2 individually selectable. Third tone fixed by tone 2 selection.