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It enables points of interest
to be marked with an acoustic transponder so that an ROV
pilot can be guided straight back to the target even in
zero visibility. The system substantially reduces search
time and therefore operating costs.
The system consists of
an ROV mounted range and direction unit, PC control software
and small, lightweight marker transponders. Once the pilot
has selected the target he wishes to 'home' into, the ROV
unit begins interrogating the designated transponder to
determine its range and direction. The information is communicated
back to the surface, via the ROV's umbilical, and is displayed
on the user's PC. It indicates the range to the target and
in which direction to turn in order to fly the ROV directly
towards the selected transponder.
The ROV mounted unit is
accurately aligned with the ROV's heading sensor and is
connected to spare cores either on the ROV's umbilical or
to the ROV's communications multiplexer. The electronics
inside the unit incorporate power regulation, an RS232 interface
and a microprocessor all of which are galvanically isolated
from the ROV's electrical system. 12V to 24V DC power supply
is connected via the same connector. On smaller ROVs which
do not have communications multiplexers and therefore cannot
support RS232, a RS485 interface can be provided.
The transponders are compact
so that they can be easily fitted to divers or equipment
and have a long life battery pack making them ideal for
use as permanent markers. Each transponder is individually
encoded enabling many transponders to be used on the same
site to unambiguously mark many targets
Technical
Specifications
| Feature |
Type 7832-000-01
|
Type 7832-000-03
|
| Depth Rating |
4,000 Metres |
12,000 Metres |
Operating Frequency
|
HF (35–55kHz) |
HF (35–55kHz) |
| Transmit Source Level
|
90dB re 1µPa @1m
|
90dB re 1µPa @1m |
| Directional Indication
(10° Wide Receive) |
Left, Right or Ahead |
Left, Right or Ahead |
| Range Resolution |
0.1 Metre |
0.1 Metre |
Maximum Operating Range
|
750 Metres (Dependent on conditions) |
750 Metres (Dependent on conditions) |
| Power Supply |
12V – 24V DC |
12V – 24V DC |
| Quiescent Life |
Continuous when powered from ROV |
Continuous when powered from ROV |
| Position Update Interval |
1.5 seconds |
1.5 seconds |
| Mechanical Construction |
Anodised Aluminium Alloys and Plastics |
Titanium grade 5 |
| Diameter (LxDia) |
272mm (10.7”) X 72mm (2.85”) |
370mm (14.57”) X 100mm (39.4”) |
| Weight in Air |
2.1kg |
8.0kg |
| Weight in Water |
1.3kg |
5.8kg |
Transponder Options
| Feature |
Type 7815-000-07 |
Type 7835-000-01
|
Type 7835-000-05
|
| Depth Rating |
500 Metres |
4,000 Metres |
12,000 Metres |
Operating Frequency
|
HF (33–35kHz) |
HF (33–35kHz) |
HF (33–35kHz) |
| Battery Life (Listening)
|
2 years (Alkaline)
4.5 years (Long-Life Lithium) |
2 years (Alkaline)
4.5 years (Long-Life Lithium) |
2 years (Alkaline)
4.5 years (Long-Life Lithium) |
| Mechanical Construction |
Aluminium Alloys and plastics |
Aluminium Alloys and S/steel |
Titanium grade 5, Anodised |
| Dimensions (LxDia) |
441mm (17.3”) x 64mm (2.5”) |
353mm (13.8”) x 64mm (2.5”) |
267mm (10.5”) x 80mm (3.1”) |
Weight in Air
|
1.1kg |
1.9kg |
5.5kg |
| Weight in Water |
0.75kg |
1.2kg |
3.8kg |
Features
:-
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Simple, low cost acoustic
guidance system for ROVs
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4,000 metre or 12,000
metre versions available
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Reduces search time
and ROV operating costs
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Critical point marking
- tools, valve heads, field joints..
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Emergency relocation
- divers, diving bells, ROVs...
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Accurately measures
distances of up to 750 metres
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Allows operation
in zero visibility
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System operates with
up to 256 small, low cost transponders
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Works with AODC Emergency
Transponders
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