| Brand |
Marine Magnetics |
| Product |
Sentinel |
| Year of development |
2000 |
| Type of sensor (caesium, Overhauser, potassium, proton) |
Overhauser |
| Is the sensor a gradiometer? (Y/N) |
N |
| Absolute accuracy (nT) |
0.1 |
| Resolution (nT) |
0.001 |
| Operating range (nT) |
18,000–120,000 |
| Gradient tolerance (nT/m) |
10000 |
| Sensitivity (nT) |
0.01 |
| Sample rate (Hz) |
1/min to 2Hz |
| External trigger possibility (Y/N) |
Y |
| Operating temperature (°C) |
–40 to +60 |
| Power requirements |
1W |
| Limits of geographic operating zones |
None |
| Direction of sensitivity |
Not affected. No dead zones |
| Fish dimensions |
124cm × 12cm diameter |
| Weight in air, water (kg) |
16, 4 |
| Depth range |
1,000m |
| Towfish mounting (towed, fixed mount, other) |
Fixed on tripod, base station |
| Power requirements |
1W |
| Type |
No tow cable |
| Is visual read-out available? (Y/N) |
Y |
| Is visual read-out available? (Y/N) |
N |
| Digital output (Y/N) |
Y |
| Supported digital data formats |
ASCII (raw) output |
| Data-aquisition/processing package |
SeaLINK |
| ROV (Y/N) |
N |
| Side-scan sonar (Y/N) |
N |
| Sub-bottom profiler (Y/N) |
N |
| Single-beam echosounder (Y/N) |
N |
| Depth sensor (Y/N) |
N |
| Heading sensor (Y/N) |
N |
| Typical applications |
Sentinel is a base station magnetometer, designed to sit in one location and collect data that are used to correct mobile magnetometer data for diurnal variation. Using an integrated tripod, it can be deployed on land or under water at a depth of up to 1,000m |
