Sonardyne UK (Head Office) T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. [email protected] www.sonardyne.com Datasheet ORT and DORT Acoustic Release Transponders Description Key Features Oceanographic Release Transponders (ORTs) and Deep Oceanographic Release Transponders (DORTs) are tough, reliable acoustic releases designed for deployment in either 2,000 metres or 6,000 metres of water. • Safe Working Load of 1,275Kg (Options for heavier loads) • 2,000 Metre or 6,000 Metre depth rated options • Highly reliable release mechanism • Up to 3 years deployment • Excellent corrosion resistance The units are commonly used to moor oceanographic instrument strings on the seabed for periods of up to 36 months. However, their compact size allows them to be easily incorporated into subsea instrument frames or installed on towfish and AUVs to enable ballast to be dropped in an emergency. Standard features include a Safe Working Load of 1,275Kg (at 4:1) and a spring-assisted release mechanism. This type of release mechanism was originally developed by Sonardyne for navigation transponders supplied to the offshore industry of which there are now many thousands reliably in service around the world. ORTs and DORTs are controlled using frequency band specific Lightweight Command Units (LCU) which comprises of a dunking transducer connected either to a spray-proof Psion or, via supplied software, to any PC. For security of operation, a special coding system provides protection against accidental release by noise and acoustic transmissions from other vessels. • Compact and rugged design Sonardyne UK (Head Office) T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. [email protected] www.sonardyne.com Specifications ORT and DORT Acoustic Release Transponders Feature Depth Rating Operating Frequency Transducer Beamshape Transmit Source Level (dB re 1µPa @1m) Receive Threshold (dB re 1µPa) Safe Working Load (4:1) (Standard Release Mechanism) Breaking Load Max. Safe Release Load Battery Life Alkaline Lithium Long-Life Lithium Shelf Life Battery Alkaline Disconnected @ 25ºC Lithium Operating Temperature Storage Temperature Mechanical Construction Dimensions (LxDia) Weight in Air Weight in Water Deck Unit Accessories Type 7409 2,000 Metres LMF (16-19kHz) Hemispherical 186dB <90dB 1,275Kg Type 7710 6,000 Metres LF (9-12kHz) Hemispherical 190dB Alkaline, 184dB Lithium 85dB 1,275Kg 5,100Kg 1,700Kg 9 months 24 months 36 months 24 months 84 months -20 to + 45ºC -30 to + 70ºC Aluminium Bronze, Stainless Steel 695mm (27.4”) x 142mm (5.6”) 22kg 17kg Type 7663 MF LCU Parallel Release Kit Heavy Duty Release Frame 5,100Kg 1,700Kg 9 months 24 months 36 months 24 months 84 months -20 to + 45ºC -30 to + 70ºC Aluminium Bronze, Stainless Steel 695mm (27.4”) x 142mm (5.6”) 22kg 17kg Type 7667 LF LCU Parallel Release Kit Heavy Duty Release Frame Specifications subject to change without notice - 04/2009