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MARINE EXPLORATION

OBX-750E

OBX-750E: Ocean Bottom Recorder

PRODUCT DETAILS

The OBX-750E is a seabed ocean bottom wireless seismic data acquisition node with a maximum operating depth of 750 meters. Nodes can be deployed in shallow offshore waters and transition zones, which include estuaries, marsh wetlands, and freshwater environments, such as rivers and lakes. Once deployed, the OBX-750E can collect seismic data continuously for up to 45 days.

FEATURES

  • Continuous, cable-free 4C autonomous recording
  • Maximum operating depth: 750 meters
  • Battery module: 60 days
  • Built-in, full-resolution test generator
  • Solid-state flash memory: 8 GB per channel
  • OVCXO clock
OBX-750E@2x

GS-ONE OMNI Geophone

PHYSICAL SPECIFICATIONS

Moving Mass 13.2 g 0.466 oz
Maximum coil excursion p-p 4.06 mm 0.16 in.
Minimum coil excursion p-p 1.02 mm 0.04 in.
Diameter 30.5 mm 1.2 in.
Height 40.7 mm 1.6 in.
Weight 130 g 4.60 oz
Operating and Storage Temperature Range -40°C to +100°C -40°F to +212°F

ELECTRICAL SPECIFICATIONS

All parameters are specified with 7.5 kΩ load at 25°C in all
tilt positions unless otherwise stated.
Frequency 15 Hz
Spurious Frequency >160 Hz
Distortion at Horizontal 0.05% Typical
Resistance with 7.5 kΩ load 1450 Ω
Sensitivity at 70% Damping 69.2 V/m/s (1.75 V/in/s)
Damping 70%
Distortion at all tilt angles 0.2% measured at 15 Hz with 0.2 in/s p-p

Hydrophone MP-18BH

ELECTRICAL SPECIFICATIONS

Nominal Capacitance (at 25°C 1atm) 16.0 nanofarads
Voltage Sensitivity 2 4 V/Bar
Sensitivity (dBv ref 1µPa @ 25°C) –208
Frequency Response (into 2 MΩ load) 5–1000 Hz (typical)

OBX-750E

MECHANICAL SPECIFICATIONS

Metric US
Length 521 mm 20.5 in.
Width 208 mm 8.2 in.
Height 108 mm 4.25 in.
Weight in Air 11.85 kg 26 lbs.
Weight in Seawater 4.1 kg 9.0 lbs.
Maximum Operating Pressure 7.5 MPa/75 Bar 1095 psi
Maximum Operating Depth 750 M 2460 ft.
Operating Temperature Range –5°C to +50°C +23°F to +122°F

ELECTRICAL SPECIFICATIONS

Digitized 4C Recording Station: 4 Channel, 24 Bit A/D Digitizer
Orthogonal oriented GS-One OMNI Geophones MP-18BH-2500 Hydrophone
Digitization 24-bit Delta-Sigma
Sample Interval 0.25, 0.5, 1, 2, 4 ms
Pre-amplifier Gains 0, 6, 12, 18, 24, 30, 36 dB
Maximum Input Signal 1.8Vrms
Equivalent Input noise (@2ms sample interval) 0.17 μVrms
Gain Accuracy Better than 1%
Anti-alias Filter 83% Nyquist
Instantaneous Dynamic Range 124dB @ 2 ms sample interval
THD <0.2%
Distance Between Digitizer & Farthest Sensor> <18 cm
Distance Between All Sensors <13 cm
Flash Memory 8 GB per channel
Frequency Response 1 Hz – 1650 Hz @ ¼ ms sample interval
Battery Module 60 days operation

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