ORT DORT Release Transponder

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 1,275 kg
(Options for heavier loads)
• 2,000 Metre or 6,000 Metre
depth rated options
• Highly reliable release mechanism
• Up to 2 years deployment
• Excellent corrosion resistance
The units are commonly used to moor
oceanographic instrument strings on
the seabed for periods of up to 24
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 1,275 kg (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
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
1,275 kg
Type 7710
6,000 Metres
LF (9-12kHz)
Hemispherical
190dB Alkaline, 184dB Lithium
85dB
1,275 kg
5,100 kg
1,700 kg
9 months
24 months
24 months
84 months
-20 to + 45ºC
-30 to + 70ºC
Aluminium Bronze, Stainless Steel
695 mm (27.4”) x 142 mm (5.6”)
22 kg
17 kg
Type 7663 MF LCU
Parallel Release Kit
Heavy Duty Release Frame
5,100 kg
1,700 kg
9 months
24 months
24 months
84 months
-20 to + 45ºC
-30 to + 70ºC
Aluminium Bronze, Stainless Steel
695 mm (27.4”) x 142 mm (5.6”)
22 kg
17 kg
Type 7667 LF LCU
Parallel Release Kit
Heavy Duty Release Frame
Specifications subject to change without notice - 3/2012