7409 SONARDYNE | Alldatasheet
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Sonardyne UK (Head Office) T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. sales@sonardyne.com www.sonardyne.com Datasheet ORT and DORT Acoustic Release Transponders
Description
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. 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. Key Features
- 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
- Compact and rugged design
Sonardyne UK (Head Office) T. +44 (0) 1252 872288 F. +44 (0) 1252 876100 E. sales@sonardyne.com www.sonardyne.com Specifications subject to change without notice - 04/2009 Specifications ORT and DORT Acoustic Release Transponders Feature Type 7409 Type 7710 Depth Rating 2,000 Metres 6,000 Metres Operating Frequency LMF (16-19kHz) LF (9-12kHz) Transducer Beamshape Hemi spherical Hemispherical Transmit Source Level (dB re 1µPa @1m) 186dB 190dB Alkaline, 184dB Lithium Receive Threshold (dB re 1µPa) <90dB 85dB Safe Working Load (4:1) (Standard Release Mechanism) 1,275Kg 1,275Kg Breaking Load 5,100Kg 5,100Kg Max. Safe Release Load 1,700Kg 1,700Kg Battery Life Alkaline Lithium Long-Life Lithium 9 months 24 months 36 months 9 months 24 months 36 months Shelf Life Battery Disconnected @ 25ºC Alkaline Lithium 24 months 84 months 24 months 84 months Operating Temperature -20 to + 45 ºC -20 to + 45 ºC Storage Temperature -30 to + 70 ºC -30 to + 70 ºC Mechanical Construction Aluminium Bronze, St ainless Steel Aluminium Bronze, Stainless Steel Dimensions (LxDia) 695mm (27.4”) x 142mm (5.6”) 695mm (27.4”) x 142mm (5.6”) Weight in Air 22kg 22kg Weight in Water 17kg 17kg Deck Unit Type 7663 MF LCU Type 7667 LF LCU Accessories Parallel Release Kit Heavy Duty Release Frame Parallel Release Kit Heavy Duty Release Frame