About Kahlenberg UK

Kahlenberg UK Ltd is the European distributor for Kahlenberg Industries, Inc. providing full European support and local stock for Kahlenberg marine and industrial air horns, sound signals, controllers, air compressors and the company's other products.

Please contact us for further assistance at or on +44 (0)1635 35353

Sound signal legal requirements

IMO COLREGs bookWhile countries across Europe will have local laws that apply to ship and boat navigation, there is a common requirement worldwide for all leisure, commercial and military vessels to conform to the IMO International Regulations for Preventing Collisions at Sea. As Steve Austin, Senior Policy Lead at the UK Maritime & Coastguard Agency (MCA) explains: "The COLREGs apply to all vessels, there is no differentiation between coded and non-coded vessels. Should the whistles prove not to conform then they will need to be modified or changed."

"Whistles should conform to the performance in COLREGs, Appendix III and the appropriate parts of IEC 60945 to EN60945 which deal with the marine operating environment."

All Kahlenberg products meet or exceed these requirements. Many other new and currently installed sound signals are non-compliant and might be breaching maritime law and invalidating insurance cover.

Kahlenberg D-330 and S-330-DVM marine air horns launched at Seawork

Kahlenberg D-330 marine air hornKahlenberg UK is pleased to announce the launch of the new D-330 twin trumpet marine air horn and S-330 single trumpet heated marine air horn at Seawork International 2012.

The Kahlenberg D-330 provides a fully IMO compliant ABS type approved twin trumpet sound signal in an economic and compact package suitable for use on vessels between 20m (65ft) and 75m (246ft). It is particularly suitable where low installation weight is desirable.

The D-330 has been carefully designed in Kahlenberg’s anechoic chamber to provide a consistently powerful and distinctive sound for a minimum of air supply.


As with all Kahlenberg sound signals the D-330 is built in quality materials — spun brass and with a highly reliable titanium diaphragm. It can be supplied in sky white powdercoat or chrome.


The fundamental frequencies of the Kahlenberg D-330 marine air horn are 330Hz and 280Hz and its SPL dB(A) is 133dB. Air consumption is 18CFM (8.4 l/s) @ 100psi (7 bar). It works on a wide range of pressures from 50-200psi (3.5-14 bar). It measures 563mm x 288mm x 181mm (22.3in x 11.3in x 7.1in) and weighs just 4kg (9lb).

The D-330 can be run from onboard air supplies or from compact compressor kits. Kahlenberg UK will be pleased to advise on installation requirements.

S-330-DVM heated air horn

Kahlenberg S-330-DVM heated marine air hornKahlenberg has also released a new version of the S-330 that was launched last year. This features a heated operating valve offering dual electric operation with a manual override to provide for redundancy, enhancing crew and vessel safety.

The S-300-DVM’s heater is watertight and thermostatically controlled. It operates on 24VDC and 120VAC or 230VAC.

The finish of the horn is TGIC sky white powdercoat and it can safely operate down to -4°C. The S-300-DVM can be mounted to vertical or horizontal surfaces.

As with the Kahlenberg D-330 this model is fully ABS type approved and suitable for vessels between 20m (65ft) and 75m (246ft). Both models can be seen on Kahlenberg UK’s stand at Seawork, B111.

Further information

Call Kahlenberg UK now on +44 (0)1635 35353 or email