24-ECONOMICAL HIGH RESOLUTION OBS SYSTEM

MODEL OBS-24






The OBS-24 is a complete economical ocean bottom seismograph for temporary deployment with retrievable applications. It is a short period seismometer package used in seismic monitoring and ocean bottom surveys.

It is field proven with 100’s of packages installed over 5 years.

The instrument package includes a triaxial seismometer, hydrophone, 24-bit recorder, batteries, acoustic release system, flasher, and frame. A radio transponder is not installed in the standard unit because each radio must have a license according to local laws. As an option, a flasher with transponder can be added. The package power consumption is extremely low. The gimbaled seismometer package can operate up to a +/- 45 degree tilt. The 100Kg weight with sinker provides excellent seabed coupling and minimizes current drag. The sphere buoyancy is approximately 5Kg.

Compared to other OBS systems the OBS-24 is lightweight with small dimensions. The standard instrument package operates for 30days. Longer duration is available with additional batteries. The package is forklift compatible.

The instrument package comes standard with an 8 GB flash card for data storage. Optional 30Gb removable hard disk is available. Optional freestanding expansion disk reader that connects to a standard PC USB port is also available.


 


FEATURES

  • Economical
  • Complete system ready to deploy
  • Low Power
  • Small dimensions to minimize deck space
  • 24-bit resolution recorder
  • Operational over a wide range of tilt
  • Excellent seabed coupling
  • Optional battery choices
SPECIFICATIONS
RECORDER
Model
DAT-5OBS
Number of channels
4
Gain
20dB or 40dB selectable at preamplifier hardware switch
ADC converter
24-bit Delta Sigma on each channel
Resolution
120 dB @ 100Hz sample rate
Sample Rates
50, 100, 200, 250Hz
Recorder input
Matches sensors. +/-2 at ADC converter input
Over voltage protection
+/-5V at ADC input for analog signal input
Internal buffer memory
8Mb
Digital Filters
Included in the ADC
Recording method
Continuous, user selectable start and stop times
Setup interface
RS-232. External PC (terminal software)
TIMING SYSTEM
Type:
TCXO +/-2 x E-7 set by GPS
GPS
Included
Basic OBS-24 configuration The standard configuration includes 4channel recorder with internal geophones, external hyrophone, 8Gb flash card, acoustic release, C-cell batteries, frame and sinker.
Data Storage

option -30GBHD

External HD USB reader option -ER
Batteries with charger option -Li
CONSUMABLES
Batteries

Li-ion
C-cell Alkaline (obtain locally)
Consult factory
Sinker Consult factory
   

S Printer Friendly Format For Specifications

DATA STORAGE
Storage capacity
8Gb Flash card standard (1 month operation)
Storage Capacity optional
Removable 30Gb hard disk (3 month operation)
SENSORS
Geophone
GM-3, sensor elements L-22B geophones
Tilt
+/-45 deg.
Hydrophone
Sensortech model SQ-06
PHYSICAL
Acoustic release.
Slant range Appx. 10Km, acoustic code selectable up to 120 channels
Flasher
Novatech ST-400A
Power supply
7V to 12V DC (internal batteries)
Power consumption
0.5W, appx 2.8W when recoding (15sec every 30min)
Maximum depth
6,500m
Weight
100Kg includes sinker, appx buoyancy 5Kg
Batteries
D-cell Alkaline standard (low cost), Li-ion optional (expensive)
 

 

 


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