| Brand |
Geometrics |
| Product |
G-882 Marine Magnetometer |
| Year of development |
2004 |
| Type of sensor (caesium, Overhauser, potassium, proton) |
Caesium vapor |
| Is the sensor a gradiometer? (Y/N) |
Single sensor, can be configured as gradiometer or multi-sensor array |
| Absolute accuracy (nT) |
2 (note that this has little relevance to actual marine surveys) |
| Resolution (nT) |
0.001 |
| Operating range (nT) |
18,000–90,000 |
| Gradient tolerance (nT/m) |
5000 |
| Sensitivity (nT) |
0.004/rtHz RMS |
| Sample rate (Hz) |
40 |
| External trigger possibility (Y/N) |
Y |
| Operating temperature (°C) |
–35 to +50 |
| Power requirements |
10W @ 24VDC |
| Limits of geographic operating zones |
All directions worldwide, except due N-S at equator |
| Direction of sensitivity |
Heading error less than 0.15nT over 360° spin |
| Fish dimensions |
Body diameter 2.75in (7cm), 4.5ft (1.37m) long with fin assembly (11in cross width) |
| Weight in air, water (kg) |
18kg – including sensor and electronics and 1 main weight |
| Depth range |
4,000psi |
| Towfish mounting (towed, fixed mount, other) |
Nose or CG tow |
| Power requirements |
24–32VDC, 500mA (1A on start up, 2 min) |
| Type |
Kevlar, 6 conductor, steel coax with telemetry |
| Maximum length |
300m standard, 800m with voltage sense supply, 6km with telemetry |
| Breaking strength |
3,600lb |
| Diameter (mm) |
12.2 |
| Weight in air, water |
52kg/300m, 20kg/300m |
| Is cable termination field replaceable? (Y/N) |
Y |
| Is visual read-out available? (Y/N) |
Y, with data-logging software |
| Is visual read-out available? (Y/N) |
N |
| Digital output (Y/N) |
Y |
| Supported digital data formats |
Multiple |
| Data-aquisition/processing package |
MagLog Lite, MagMap2000 (Free), MagPick (Free) |
| ROV (Y/N) |
Y |
| Side-scan sonar (Y/N) |
Y |
| Sub-bottom profiler (Y/N) |
Y |
| Single-beam echosounder (Y/N) |
Y |
| Depth sensor (Y/N) |
Y |
| Heading sensor (Y/N) |
Y |
| Typical applications |
Search for pipelines, power/telecommunication cables, unexploded ordnance (UXO), wrecks, treasure, oil/gas and mineral exploration surveys, infrastructure, hazards, degaussing station surveys, geophysical research |
