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MARINE EXPLORATION

OBX-125

OBX-125: Ocean Bottom Recorder

PRODUCT DETAILS

The OBX-125 is designed for extended-duration seabed ocean bottom seismic data acquisition. Nodes can be deployed in depths exceeding 3,400 meters with continuous recording for up to 125 days.

FEATURES

  • Continuous, cable-free 4C autonomous recording
  • Battery module: 125 days operation
  • Built-in, full-resolution test generator
  • Solid-state flash memory: 32 GB per channel
  • CSAC clock
OBX-125@2x

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 Deepender™ 5000-X

PHYSICAL SPECIFICATIONS

Maximum Operating Pressure 34.5 MPa (5,000 psi)
Maximum Working Depth 3450 m   (11,319 ft.)
Operating Temperature Range1 –10 to +75°C (+14 to 167°F)
Outside Diameter 50.8 mm (2.0 in.)
Length 38.1 mm (1.5 in.)

ELECTRICAL SPECIFICATIONS

Nominal Capacitance (at 25°C 1atm) 20.0 nanofarads
Voltage Sensitivity2 4.0 μV/μBar
Sensitivity (dBv ref 1μPa @ 25°C) –181.9 dB re 1nC/μPa
Frequency Response (into 2 MΩ load) 3 –15,000 Hz

MECHANICAL SPECIFICATIONS (Housing)

Length 500 mm 19.7 in.
Width 215 mm 8.48 in.
Height 111 mm 4.38 in.
Weight in Air 17.0 kg 37.5 lbs.
Weight in Seawater 9.9 kg 21.8 lbs.
Maximum Operating Pressure 34.5 MPa/345 Bar 5,000 psi
Maximum Operating Depth 3,450 M 11,316 ft.
Operating Temperature Range –5°C to +35°C +23°F to +95°F
Storage Temperature Range –10°C to +40°C +14°F to +104°F

ELECTRICAL SPECIFICATIONS

Digitized 4C Recording Station: 4 Channel, 24 Bit A/D Digitizer 3C Orthogonal oriented GS-One OMNI 15 Hz Geophones 1 DEEPENDER 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 1.8 Vrms
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 32 GB per channel
Frequency Response 1 Hz – 1650 Hz @ ¼ ms sample interval
Battery Module 125 days operation

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