Marine Magnetics Device / Instrument
Sentinel
Stationary Overhauser base-station magnetometers that correct survey data for diurnal and magnetic-storm variation, for land or seafloor deployment to 6,000 m.
Description
Sentinel base stations act as a second, stationary magnetometer that removes random and systematic background magnetic variation, such as diurnal changes and magnetic storms, from survey data. Two versions are offered.
Key features
- Sentinel2: tripod base station with integrated GPS for UTC time sync, WiFi data transfer and 30-45 hours battery life; 0.02 nT sensitivity; 15.2 kg on land
- Sea Sentinel: seafloor base station rated to 1000 m (optional 3000 m or 6000 m) with 0.015 nT standard sensitivity, 0.2 nT absolute accuracy and a one-million-reading memory
- Sea Sentinel deploys by float or tripod with acoustic release recovery and is configured with BaseLink software
- Range 18,000 to 120,000 nT
Applications
Correcting marine magnetometer survey data for background magnetic variation over long survey periods.
Specifications
| Sentinel2 sensitivity | 0.02 nT |
|---|---|
| Sentinel2 battery life | 30 hrs (@ 1 Hz) – 45 hrs (@ 0.1 Hz) |
| Sentinel2 weight on land | 15.2 kg |
| Sea Sentinel sensitivity | 0.015 nT (standard) 0.02 nT (optional) |
| Sea Sentinel absolute accuracy | 0.2 nT |
| Sea Sentinel depth rating | 1000m (Optional: 3000m, 6000m) |
| Sea Sentinel storage | One million readings |
| Range | 18,000 to 120,000 nT |
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