Local control unit of the SAOL system
EWSA-4
Electronic multifunction alarm siren
Four-horn, 600 W siren for city districts, municipalities and industrial areas. 118 dB(A) at 30 m with horns facing one direction.
- dB(A) at 30 m
- 118
- amplifier power
- 600 W
- horns
- 4
Technical data
| Frequency response | 200–10 000 Hz |
|---|---|
| Alarm frequency | dual-tone 415/425 Hz |
| Sound level – directional horns (1 row, 0°) | 118 dB(A) / 30 m |
| Sound level – back-to-back horns (1 row, 180°) | 109 dB(A) / 30 m |
| Number of horns | 4 |
| Number of amplifiers | 2 |
| Amplifier power | 600 W |
| Maintenance-free batteries | 2 × 12 V 38 Ah |
| Mains supply | AC 230 V 50 Hz |
| Standby power consumption | avg. 6 W |
| Power consumption while charging | max 100 W |
| Standby without mains power | > 10 days |
| Alarms within 48 h | > 15 alarms × 1 min (20 °C) |
| Communication | RS-485 (RJ45) |
| Horn array dimensions (W × H × D) | 840 × 1380 × 160 mm |
| Horn array material | aluminium alloy |
| Horn array weight | 38 kg |
| Horn array operating temperature | −50…+70 °C |
| Control cabinet dimensions | 600 × 600 × 210 mm |
| Cabinet weight incl. batteries | 75 kg |
| Cabinet operating temperature | −25…+70 °C |
| Environment | Range to threshold |
|---|---|
| Open terrain | ≈ 1.4 km |
| Small towns | ≈ 1.3 km |
| Housing estates | ≈ 940 m |
| Large cities | ≈ 710 m |
Estimate based on manufacturer curves: 109 dB(A) at 30 m (back-to-back horns), 6 dB loss per doubling of distance plus attenuation depending on the built environment. Actual range depends on terrain, mounting height and background noise — we run an acoustic simulation for each site.
Functions
Alarm signals
- civil defence alarm signals
- fire alarm
- 5-second alarm
- programmable signals
Voice messages
- live via a remote microphone
- messages from memory modules
- from the local microphone
Control
- remote VHF/UHF radio (analogue and digital)
- LAN, cable links
- locally: keypad or button
- optional GSM module
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