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Summary of Contents for Geometrics MicroEel
- Page 1 MicroEel Solid Analog Streamer P/N 60101-13 Rev. C May 6, 2012 Operation Manual GEOMETRICS, INC. 2190 Fortune Drive San Jose, CA 95131 USA Tel: (408) 954-0522 Fax: (408) 954-0902 sales@geometrics.com support@geometrics.com www.geometrics.com COPYRIGHT © 2011, 2012...
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Page 2: Table Of Contents
....................13 EPLOYMENT ..................14 ATTERY HARGING 4 – APPENDIX ....................... 16 ..................16 ONNECTOR IRING ..................... 16 ALIBRATION ....................17 PECIFICATIONS ................. 18 ARRANTY AND ERVICE MicroEel Solid Analog Streamer Operation Manual Page 2 of 18 Rev. C 050612 du... - Page 3 List of Figures Figure 1. MicroEel active section with solid flotation (green) and tow cable (black)..4 Figure 2. MicroEel solid analog streamer block diagram..........6 Figure 3. Topside deck cable connector terminations (NK-27 termination not shown)..8 Figure 4. Deck cable 55-socket connector termination............. 8 Figure 5.
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Page 4: Introduction
The active section is built using Geometrics continuous-flotation molding method (Figure 1). Figure 1. MicroEel active section with solid flotation (green) and tow cable (black). In addition, the MicroEel uses unique proprietary polymer hydrophones, which unlike ceramic hydrophones are non-shattering. -
Page 5: System Components
The opposite end of the deck cable is finished with a Y-type termination to connect to the DHA-7/MicroEel Battery Pack and seismograph. The total maximum length of the streamer from head of the deck cable to tail of the active section is 400 m. -
Page 6: Figure 2. Microeel Solid Analog Streamer Block Diagram
Figure 2. MicroEel solid analog streamer block diagram. MicroEel Solid Analog Streamer Operation Manual Page 6 of 18 Rev. C 050612 du... -
Page 7: Hydrophones
The hydrophones are depth-limited and become inoperable at depths greater than 30 ±5 m. The inoperable state is temporary and functionality fully recovers when the depth is reduced. This limitation allows the MicroEel to be exported under less strict US Department of Commerce laws. -
Page 8: Figure 3. Topside Deck Cable Connector Terminations (Nk-27 Termination Not Shown)
The standard deck cable termination for analog input from the tow cable is one 55-socket waterproof connector (Glenair 220-06E16-55SN) (Figure 4). Figure 4. Deck cable 55-socket connector termination. MicroEel Solid Analog Streamer Operation Manual Page 8 of 18 Rev. C 050612 du... -
Page 9: Cable Crate
The streamer is shipped coiled in a crate for storage, transport, and deployment (Figure 6). The crate is fully composed of inorganic plastic to comply with international shipping regulations. MicroEel Solid Analog Streamer Operation Manual Page 9 of 18 Rev. C 050612 du... -
Page 10: Power Supply And Requirements
Figure 6. Crate for transport, storage, and deployment. Power Supply and Requirements The streamer is powered by the DHA-7/MicroEel Battery Pack. The battery pack is rechargeable using the included AC battery charger. 2.2.1 DHA-7/MicroEel Battery Pack The DHA-7/MicroEel Battery Pack (Figure 7) contains two 12V DC deep discharge (5 Amp-hour) sealed lead-acid batteries used in a ±12V DC differential power... -
Page 11: Figure 7. Dha-7/Microeel Battery Pack
Figure 8. Detail of DHA-7/MicroEel Battery Pack. The MicroEel is designed to be powered by the DHA-7/MicroEel Battery Pack; use of another power source is not advised and could damage the streamer and void the warranty. -
Page 12: Power Consumption
90V AC to 264V AC. The output is 1.5 Amps constant current at 24V DC. Depending on the recharging mode of the charger and the state of the batteries, output levels will vary. MicroEel Solid Analog Streamer Operation Manual Page 12 of 18 Rev. C 050612 du... -
Page 13: System Set-Up
Deployment Most MicroEel streamers are easily deployed by hand or a small winch may be desired. Avoid rubbing the tow cable jacket and active section flotation material on sharp or rough edges. -
Page 14: Battery Charging
Figure 9. Sheet lead, tin snips, and Bulldog tape. Battery Charging A new DHA-7/MicroEel Battery Pack should be charged for a minimum of 20 hours prior to use. In addition, the temperature when the charging occurs should be between 41 to 77 degrees F (5 to 25 degrees C). - Page 15 6 months or sulphation will reduce the storage capacity. Depending on the charging, depth of discharge, and use conditions, the expected number of recharge cycles is usually between 500 and 1000. MicroEel Solid Analog Streamer Operation Manual Page 15 of 18 Rev. C 050612 du...
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Page 16: Appendix
Channel 1 is always wired as the first hydrophone/hydrophone group in the active section. Figure 10 shows the battery pack-to-streamer wiring. Figure 10. DHA-7/MicroEel-D Battery Pack wiring. Calibration All hydrophone channels of any given streamer have been low-frequency calibrated over a band from 0 to 200 Hz as a quality control measurement. -
Page 17: Specifications
6 dB Low Corner Frequency -3 dB at 10Hz Current 11mA per channel Power ±12 V DC DHA-7/MicroEel Battery Pack (topside) Active Section Channels 12 or 24; other counts available* Hydrophones per Group 1 or 3; other counts available* Group Aperture 0 or 0.22 m;... -
Page 18: Warranty And Service
If the equipment fails during the applicable warranty period, Geometrics will repair or replace the defective item at its factory in San Jose, California at no charge to the customer for parts and labor. The cost to ship the equipment to Geometrics' factory and back to the customer's site is for the customer's account.
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