AT 150/330 air whistle, designed to meet regulations Zone 2 German inland waterways.

Powerful IMO-Compliant Air Horn for Inland Waters

The AT150/330 is a powerful air horn designed to meet IMO maritime regulations for inland waterways, including Zone 2 waterways and German sea arms like the Ems, Dollard, Weser, and Elbe. This air horn is required for vessels over 20 meters in length, with a sound level of 132 dB at 1 meter and a base frequency between 130 and 350 Hz. AT 150/330 zone 2
 
IMO Requirements for Zone 2 Waterways

In Germany, Zone 2 waterways require an air horn that complies with IMO regulations. Ships over 20 meters must have an air horn that delivers the specified sound level and frequency to ensure safety and proper signaling. The AT150/330 meets these stringent standards, offering reliable performance under varying conditions.
 

Easy Installation and Customization

The air horn comes with a specially designed bracket, allowing it to be easily installed and adjusted in any direction to fit different vessel setups. Brackets are available in durable aluminum and stainless steel to suit various installation environments.

Additionally, the air connection is highly customizable, providing flexibility for both the horn and the air control unit to meet specific requirements. This makes the AT150/330 adaptable to various ship systems.
 

Certified for German Regulations

To ensure compliance with German regulations for Zone 2 waterways, the AT150/330 comes fully BSH certified. Its combination of power, ease of installation, and regulatory approval makes it the ideal choice for ships navigating these areas.

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Technical Data

• Frequency: 330 Hz
• Sound Pressure Level (1m):
  Total: 148 dB
  1/3 octave IMO limit: 138 dB
• Air consumption: 20 – 30 I/s
• Standard with Solenoid Valve TV 88
• Weight: 11,5 kg
• BSH Approval

ETD 100/350 electric whistle, suitable for vessels with a LOA 20m till 75m.

A Strong Signal Without Noise

Many who navigate under the IMO Regulations (COLREG 1972) understand the importance of sound pressure levels for efficient signaling. However, the rules also state that “the sound pressure level of the vessel’s own signal at the listening posts shall not exceed 110 dBA and, as far as practicable, should not exceed 100 dBA.” This creates a challenge: how can a vessel emit a strong signal without producing excessive noise onboard?
 

Solving the Paradox

The common solution to this dilemma is placing the whistle high above deck. But what if even the highest point isn’t high enough? The answer lies in a whistle with unsymmetrical sound distribution. This innovative design offers several benefits:

• Focused Sound Radiation: The total sound is directed towards the horizontal plane, reducing downward (and upward) noise by up to 10 dBA.
• Even Sound Distribution: The sound spreads appropriately in all horizontal directions, ensuring compliance with the headline sound pressure levels prescribed by IMO.
• Optimized Sound Spectrum: This specially designed sound spectrum ensures high electro-acoustic efficiency and rich “tone color,” making the signal more perceptible in noisy environments.
• Durable Design: The horn uses twin-unit electrodynamic drivers protected by non-metallic, glass-fiber reinforced polyester, ensuring durability and long-term performance.

These advancements come together in the TYFON ETD 100/350, a new horn with a vertically extended front that tackles the issue of excessive onboard noise.
 
Additionally, when a “combined system” of two whistles, as described by the IMO, is employed, an even more effective and significant tone spectrum is produced. An air-driven TYFON for 260 or 440 Hz adds further reliability and top-notch performance.

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Technical data

• Frequency (basic): 350 Hz
• Sound Pressure Level (1m) Total: 132 dB
• 1/3 octave (IMO limit 130dB): 131 dB
• Power consumption (signal): 250 W
• Power consumption (standby) 5 W
• Heating element: 25 W
• Power source (nominal): 24V DC
  Min: 20V DC. Max: 27V DC
• Operating ambient temp. (MTK 250): 0… + 50° C
• Protection class: IP64
• Weight (ETD 100/350): 8 kg
• Weight (MTK 250): 3.1 kg

MKT 75/260 Air whistle, , suitable for vessels with a LOA 20m till 75m.

Regulations Before and After COLREG 1972

Before “COLREG 1972” (International Regulations for Preventing Collisions at Sea), low-pitched tones were often used for smaller vessels. However, the principle of reserving low tones for large vessels was not strictly enforced. The IMO regulations now reserve very low tones exclusively for the largest ships. For middle-sized and smaller vessels, there are broader frequency options available.

Signal Preferences and Frequency Range

IMO regulations prioritize signals that maintain audibility even at a distance. Vessels between 20 and 75 meters (66 – 246 feet) should use whistles with frequencies ranging between 250 and 700 Hz. These frequencies ensure effective communication and compliance with maritime safety standards.

Optimal Whistle Positioning for Clear Sound Propagation

Proper whistle positioning is essential for ensuring clear, unobstructed sound radiation. Large deck surfaces can disrupt sound waves, similar to how light waves experience optical refraction. This disruption can diminish the effectiveness of the whistle. To prevent such issues, it’s crucial to place the whistle where no obstacles interfere with sound propagation.
 

Meeting IMO Regulations for Safety

The International Maritime Organization (IMO) emphasizes the importance of selecting an appropriate whistle position on board. Not only does this ensure efficient signaling, but it also guarantees that the permissible sound levels at the listening post are maintained. Excessive noise at this post can be a safety concern, so careful placement is key.
 
For the best results, a combined whistle system should be used, featuring a frequency difference of at least 10 Hz between the two whistles. This setup complies with IMO safety regulations and enhances sound distribution across the vessel. Proper installation ensures both strong signaling and adherence to safety standards, protecting crew members from high noise levels while ensuring effective communication at sea.

Contact Us for More Information

If you have any questions or require Kockum Sonics ship whistle or spare parts.

Contact us.

Technical Data

• Frequency: 260 Hz
• Sound Pressure Level (1m):
  • Total: 143 dB
  • 1/3 octave IMO limit: 130 dB
• Air consumption: 8 – 10 I/s
• Air supply pressure: 0,3 – 0,45 MPa (3 – 4,5 bar)
• Weight: 2,85 kg

MKT 75/350 Air whistle, , suitable for vessels with a LOA 20m till 75m.

Regulations Before and After COLREG 1972

Before “COLREG 1972” (International Regulations for Preventing Collisions at Sea), low-pitched tones were often used for smaller vessels. However, the principle of reserving low tones for large vessels was not strictly enforced. The IMO regulations now reserve very low tones exclusively for the largest ships. For middle-sized and smaller vessels, there are broader frequency options available.

Signal Preferences and Frequency Range

IMO regulations prioritize signals that maintain audibility even at a distance. Vessels between 20 and 75 meters (66 – 246 feet) should use whistles with frequencies ranging between 250 and 700 Hz. These frequencies ensure effective communication and compliance with maritime safety standards.

Optimal Whistle Positioning for Clear Sound Propagation

Proper whistle positioning of MKT 75/350 is essential for ensuring clear, unobstructed sound radiation. Large deck surfaces can disrupt sound waves, similar to how light waves experience optical refraction. This disruption can diminish the effectiveness of the whistle. To prevent such issues, it’s crucial to place the whistle where no obstacles interfere with sound propagation.
 

Meeting IMO Regulations for Safety

The International Maritime Organization (IMO) emphasizes the importance of selecting an appropriate whistle position on board. Not only does this ensure efficient signaling, but it also guarantees that the permissible sound levels at the listening post are maintained. Excessive noise at this post can be a safety concern, so careful placement is key.
 
For the best results, a combined whistle system should be used, featuring a frequency difference of at least 10 Hz between the two whistles. This setup complies with IMO safety regulations and enhances sound distribution across the vessel. Proper installation ensures both strong signaling and adherence to safety standards, protecting crew members from high noise levels while ensuring effective communication at sea.

Contact Us for More Information

If you have any questions or require Kockum Sonics ship whistle or spare parts.

Contact us.

Technical Data

• Frequency: 350 Hz
• Sound Pressure Level (1m):
  • Total: 143 dB
  • 1/3 octave IMO limit: 130 dB
• Air consumption: 8 – 10 I/s
• Air supply pressure: 0,3 – 0,45 MPa (3 – 4,5 bar)
• Weight: 1,95 kg

MKT 75/440 Air whistle, suitable for vessels with a LOA 20m till 75m. Approved for inland vessel.

Regulations Before and After COLREG 1972

Before “COLREG 1972” (International Regulations for Preventing Collisions at Sea), low-pitched tones were often used for smaller vessels. However, the principle of reserving low tones for large vessels was not strictly enforced. The IMO regulations now reserve very low tones exclusively for the largest ships. For middle-sized and smaller vessels, there are broader frequency options available.

Signal Preferences and Frequency Range

IMO regulations prioritize signals that maintain audibility even at a distance. Vessels between 20 and 75 meters (66 – 246 feet) should use whistles with frequencies ranging between 250 and 700 Hz. These frequencies ensure effective communication and compliance with maritime safety standards.

Optimal Whistle Positioning for Clear Sound Propagation

Proper whistle MKT 75/440 positioning is essential for ensuring clear, unobstructed sound radiation. Large deck surfaces can disrupt sound waves, similar to how light waves experience optical refraction. This disruption can diminish the effectiveness of the whistle. To prevent such issues, it’s crucial to place the whistle where no obstacles interfere with sound propagation.
 

Meeting IMO Regulations for Safety

The International Maritime Organization (IMO) emphasizes the importance of selecting an appropriate whistle position on board. Not only does this ensure efficient signaling, but it also guarantees that the permissible sound levels at the listening post are maintained. Excessive noise at this post can be a safety concern, so careful placement is key.
 
For the best results, a combined whistle system should be used, featuring a frequency difference of at least 10 Hz between the two whistles. This setup complies with IMO safety regulations and enhances sound distribution across the vessel. Proper installation ensures both strong signaling and adherence to safety standards, protecting crew members from high noise levels while ensuring effective communication at sea.

Contact Us for More Information

If you have any questions or require Kockum Sonics ship whistle or spare parts.

Contact us.

Technical Data

• Frequency: 440 Hz
• Sound Pressure Level (1m):
  • Total: 143 dB
  • 1/3 octave IMO limit: 130 dB
• Air consumption: 8 – 10 I/s
• Air supply pressure: 0,3 – 0,45 MPa (3 – 4,5 bar)
• Weight: 1,85 kg