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The LRT is depth rated to
500 metres making it the ideal choice for use in continental
shelf waters. Field replaceable alkaline or lithium battery
packs give a listening life of 18 months and 52 months respectively.
A 'screw-off' release mechanism ensures a positive release
action that overcomes any biological growth and all external
parts are made of high strength plastics that provide excellent
corrosion resistance.
The Type 7967 surface control
unit comprises a low-cost deck unit and remote transducer
on 10 metres of cable. The deck unit is initially used to
program the acoustic identity of the LRT, test the transponder
and load the release 'bit' prior to deployment. Once deployed,
the deck unit can measure ranges to the transponder and
prior to sending a secure release command, relocate the
transponder. The deck unit can be controlled via RS232 enabling
raw range data to be logged to a PC.
The transponder is compatible
with Sonardyne's ROV-Homer and Homer-Pro target relocation
systems. Deployed at a point of interest and weeks or years
later, the LRT can be interrogated to provide range and
direction guidance to a ROV pilot or diver wishing to home
back on to it.
Furthermore, the transponder's
exact seabed co-ordinates can be quickly and easily determined
using Sonardyne's Prospector system, calibrated from a dGPS
positioned vessel. A rope canister is also available with
75 metres of rope for pop-up buoy applications.
Technical Specifications
:-
| Features
|
Type 7986 |
| Depth Rating |
500 Metres |
| Operating Frequency |
HF (35–50kHz) |
| Transmit Source Level |
185dB re 1µPa @1m |
| Receive Sensitivity |
<110 dB re 1µPa |
| Number of Unique Addresses |
3609, (Field Programmable) |
| Switch On |
Continuously Operating (NO On/Off switch) |
| Battery Life |
Alkaline: 18 months
Lithium: 34 months
Long- Life Lithium: 52 months |
| Safe Working Load (at 4:1
ratio) |
125kg |
| Release Load |
125kg |
| Breaking Load |
500kg |
| Proof Load |
250Kg (Note: A Proof Test Certificate
can be provide upon request) |
| Mechanical Construction
|
Plastic, Stainless Steel and Anodised
Aluminum Alloy |
| Dimensions (LxDia) |
490mm (19.3”) X 63mm (2.48”) |
| Weight in Air |
1.77kg |
| Weight in Water |
0.42kg |
| Options |
75 Metre or 100 Metre Rope Canister
(Longer lengths available upon request) |
| Deck Unit |
Type 7967-000-02 (Includes transducer
and 10 metres of cable) |
| Safe Working
Load - The maximum recommended working load. This is
set as a quarter (1/4) of the Breaking Load and allows
for factors such as corrosion, fatigue, shock loads,
harmonic loads, manufacturing defects and material defects.
Release Load - The maximum in-line load that the
whole assembly can release whilst guaranteeing safe
and reliable operation. Note that as the load is released
in water, this is determined by the maximum upthrust
from the buoyancy.
Breaking Load - The load that induces structural
failure in one or more parts of the instrument causing
the load to part from the release mechanism.
Proof Load - The load to which the actual unit has
been tested in the factory. This load should be periodically
applied to demonstrate that the unit is still in a
safe condition. This is usually twice (x 2) the SWL.
A Proof Load Certificate can be provided upon request.
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Features:-
- Safe Working Load of 125Kg
- Depth rated to 500 Metres
- Over 4 years deployment with long-life
Lithium battery pack
- Thousands of secure identities; field
programmable with deck unit
- Reliable, 'screw-off' release
- Rugged, compact design
- Compatible with Scout USBL, ROV-Homer,
Homer-Pro and Prospector positioning/relocation systems
- Optional rope canister with 75 Metres
of 1200Kg breaking-strain rope
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