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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.
Technical Specifications
| Feature
|
Type 7409
|
Type 7710 |
| Depth Rating |
2,000 Metres |
6,000 Metres |
Operating Frequency
|
MF (18-36kHz) |
LF (7.5-15kHz) |
| Transducer Beamshape |
Hemispherical |
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 + 45ºC |
-20 to + 45ºC |
| Storage Temperature |
-30 to + 70ºC |
-30 to + 70ºC |
| Mechanical Construction |
Aluminum Bronze, Stainless Steel |
Aluminum 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 |
Features
:-
- Standard Safe Working Load of 1,275kg
(Options for heavier loads)
- Up to 50 tonnes SWL with optional heavy
duty release frame
- 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
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