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OBX2-90

Deepwater OBX2-90 Ocean Bottom Recorder

PRODUCT DETAILS

The OBX2-90 is designed for extended-duration seabed ocean bottom seismic data acquisition. Nodes can be deployed in depths exceeding 3,450 meters with continuous recording for up to 90 days.

FEATURES

  • Continuous cable-free 4C autonomous recording
  • Battery module: 90 days operation
  • Built-in full resolution test generator
  • Solid-state flash memory: 16 GB per channel
  • CSAC clock
  • Built-in heading sensor

 

OBX2-90 bright

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

Coil Resistance

1450 Ω

Open-Circuit Sensitivity

69.2 V/m/s (1.75 V/i/s)

Sensitivity at 70% Damping

69.2 V/m/s (1.75 V/i/s)

Open-Circuit Damping

70%

Distortion at all tilt angles

<0.2% measured at 15 Hz with 0.2 in/s p-p

 

Deepender™ 5000-X Hydrophone

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 +/- 1.5dB

Frequency Response (into 2 Mload)

3 –15,000 Hz

1. Safe to be used slightly below 0°C as long as water is not frozen. Do not let hydrophone be frozen in ice, as this will cause irreversible damage to the crystals.

2. Voltage Sensitivity is specified when connected to OBX.

OBX2-90

MECHANICAL SPECIFICATIONS (HOUSING)

METRIC

US

Length

475 mm

18.7 in.

Width

208 mm

8.2 in.

Height

106 mm

4.25 in.

Weight in Air

16.5 kg

36.4 lbs.

Weight in Seawater

9.1 kg

20.0 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 +60°C

+23°F to +140°F

Storage Temperature Range

–10°C to +60°C

+14°F to +140°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

1.8Vrms

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

16 GB per channel

Frequency Response

1 Hz – 1650 Hz @ ¼ ms sample interval

Battery Module

90 days operation

 

CLOCK SPECIFICATIONS

Days

30

60

90

100

Max Uncorrected Drift

2ms

8ms

17ms

21ms

Corrected Drift

<.25ms

<.5ms

1ms

1ms

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