The ZÖLLNER ZET-Horn
The ZET-Horn essentially consists of a piston inside a cylinder driven by an AC 3-phase motor and a joining sound horn. The piston oscillates at a certain frequency making the air inside the sound projector vibrate in resonance to produce a clean sound audible over a wide range. Higher amplitudes of the harmonics ensure best possible penetration of the normal background noise level on board. The ZET-Horn has a run-up time of less than 0.15 seconds, which guarantees a pure, concentrated sound with best directional properties.
The following ZET-Horns are available:
Class I – Vessels of 200 metres or more in length
| ZET-Horn 70 AC | Sound frequency 70 Hz | 143 dB in 1/3rd-octave band level at 1 m |
|---|---|---|
| ZET-Horn 90 AC | Sound frequency 90 Hz | 143 dB in 1/3rd-octave band level at 1 m |
| ZET-Horn 110 AC | Sound frequency 110 Hz | 143 dB in 1/3rd-octave band level at 1 m |
Class II - Vessels of 75 metres but less than 200 metres in length
| ZET-Horn 131 AC | Sound frequency 130 Hz | 138 dB in 1/3rd-octave band level at 1 m |
|---|---|---|
| ZET-Horn 141 AC | Sound frequency 140 Hz | 138 dB in 1/3rd-octave band level at 1 m |
