Sentinel - Marine Magnetics

Survey Insurance

Measure Twice. Survey Once. There’s no accounting for weather and magnetic storms are no exception. Even on an average day, background variation caused by atmospheric activity can obscure survey data and make it harder to interpret.

On a bad day, noisy atmospheric conditions can render your data totally unusable. Unless you use a second, stationary magnetometer to compensate for both random and systematic background variation, that is.

Applications:

Ideal for months long operations

Deployments:

AUV/ASVBoat TowDiver heldROVSide Scan

Set it and forget it

Deploy Sea Sentinel once and stop thinking about your base station, so you can focus entirely on the survey.

Nothing too deep at 6,000m

Adaptably deploy via float or tripod

Onboard memory for months

Build Quality

Specialization matters

Tripod to ocean floor

Simply lower a preprogrammed sentinel to the ocean floor.

Acoustic Release

Buoy + disposable anchor let’s the system float back to the surface for easy recovery

High Performance

Sentinel’s sensitivity is state-of-the-art (0.015 nT), far superior to most traditional base station magnetometers, and its power requirement is orders of magnitude lower.

Durable for years

Protected by a pressurized housing, made of high-strength fiberglass and coated with impact-absorbing polyurethane.

Seamless BOB Integration

Easily apply correction to your sensor data in our native software

Onboard memory for months

Enormous one million reading nonvolatile memory for months of high-resolution total field magnetometer data on a single battery charge.

Make Sea Sentinel a perfect fit for your application.

Size + Weight

Magnetometer 1000 m
Length: 113.5 cm
Diameter: 12.7 cm
Weight: 17.4 kg
Weight in Water: -0.3 kg

Magnetometer 3000 m
Length: 113.6 cm
Diameter: 13.3 cm
Weight: 21.2 kg
Weight in Water: 2.8 kg

Magnetometer 6000 m
Length: 114.3 cm
Diameter: 14.6 cm
Weight: 23.5 kg
Weight in Water: 10.7 kg

Docking Base
Weight: 5 kg

Sensor

Tuned Overhauser for absolute accuracy

Absolute Accuracy: 0.2 nT
Sensitivity: 0.015 nT (standard) 0.02 nT (optional)
Gradient Tolerance: > 10,000 nT/m
Range: 18,000 to 120,000 nT
External Trigger: by RS-232
Temperature Drift: NONE
Dead Zone: NONE
Sampling Rates: 1/Minute to 2 Hz

Operation

Max Surface Incline (Tripod): 40°
Depth Rating: 1000m (Optional: 3000m, 6000m)
Operating Temperature: -25C to +60C

Data

Storage Capacity: One million readings
Storage Temperature: -60C to +70C
Communication: Full duplex, 3-wire RS232. 9600bps, 8 data bits, no parity, 1 stop bit

Battery

Battery Pack
Gel cell 12V, 7Ah

Battery Charge Time
5 hours 80% charge
10 hours full charge
Can charge while sampling

Battery Life:
40 Hrs @ 1 Hz (1 sec interval)
55 Hrs @ 0.3 Hz (3 sec interval)
80 Hrs @ 0.2 Hz (5 sec interval)
185 Hrs @ 0.1 Hz (10 sec interval)
1185 Hrs @ 1/min (60 sec interval)

System

Integrated
Electronics module
Overhauser sensor
Onboard memory

Supply your own
Acoustic Release, Float, Mooring

Software