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.

KM-DVM-H air horns

Kahlenberg KM-DVM-H series Arctic marine air hornKahlenberg KM-DVM-H air horns are suitable for vessels over 75m (246ft) with some models being suitable for ships over 200m (656ft). They are ruggedly constructed to withstand the harshest of marine environments and capable of operating in temperatures as low as -40°C and up to +80°C.

All Kahlenberg KM-DVM-H air horns have a valve assembly allowing them to cope with a wide range of supply air pressure variation, from 75psi-580psi (5 bar-40 bar). They are designed with a horizontal diaphragm head so that moisture self-drains away from the seat of the stainless steel diaphragm assembly.

There is a lot of built-in reliability and redundancy with these horns. They feature heated, thermostatically controlled combination manual override and dual electric solenoid valves (230VAC/120VAC and 24VDC) as well as a heated diaphragm. The horn itself is made of cast marine aluminium for the bell, with a brass valve assembly. It is protected to IP 56.

The usual finish is marine grey but white finish is optional.

KM-250-DVM-H air horn

This unit is suitable for ships from 75m-200m (246ft-656ft) and as an IMO audibility range of 1.5nm. Its fundamental frequency is 250Hz and it has an SPL (1/3 octave) of 139dB.

The KM-250-DVM-H measures 557mm x 350mm x343mm (22in x 14in x 14in) and weighs 12kg (29lb). Air consumption is 105 SCFM (50l/s) at 120psi (8 bar).

KM-135-DVM-H air horn

This unit is suitable for ships over 200m (656ft) and as an IMO audibility range of 2nm. Its fundamental frequency is 135Hz and it has an SPL (1/3 octave) of 144dB.

The KM-250-DVM-H measures 1378mm x200mm x559mm (55in x8in x22in) and weighs 21kg (46lb). Air consumption is 105 SCFM (50l/s) at 120psi (8 bar).

Listen to the KM-135-DVM-H air horn

Kahlenberg KM-DVM-H air horn downloads

Kahlenberg KM-DVM-H air horn technical information (PDF 108Kb)

Further information

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