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Geostuff Wall-Lock Borehole Geophones
BHG-2 Borehole Geophone
BHG-3 Borehole Geophone
BHGC-1 Geophone Controller
BHGC-4 Geophone Controller
BHGC Rechargeable Battery Option
Sales
Geostuff
12996 Somerset Drive
Grass Valley, CA 95945
U.S.A.
phone 530-274-4445
fax 530-274-4446
including
Operation Manual
Geostuff
www.Geostuff.com
info@geostuff.com
Service
Geostuff
1579 Lupine Lane
Lincoln, CA 95648
U.S.A.
phone 916-258-1090
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Summary of Contents for Geostuff BHG-2
- Page 1 Geostuff Wall-Lock Borehole Geophones including BHG-2 Borehole Geophone BHG-3 Borehole Geophone BHGC-1 Geophone Controller BHGC-4 Geophone Controller BHGC Rechargeable Battery Option Operation Manual Geostuff www.Geostuff.com info@geostuff.com Sales Service Geostuff Geostuff 12996 Somerset Drive 1579 Lupine Lane Grass Valley, CA 95945 Lincoln, CA 95648 U.S.A.
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Page 3: Important Notices
Do not apply more than 36 volts to the BHG-3 orientation mechanism. o Geostuff has a tutorial paper on conducting borehole shear wave surveys. If you do not have a copy, request one. - Page 5 The Geostuff family of borehole instruments includes several products. ! The BHG-2 is a 3-component borehole geophone with a motor- driven clamp mechanism. ! The BHG-3 is a 3-component borehole geophone with a motor- driven clamp mechanism and a flux-gate compass and servo...
- Page 6 Longitudinal geophone points toward the clamp geophone in place against the wall of a borehole. spring. The BHG-2 can be used for a variety of borehole To operate the clamp mechanism without a controller, seismic surveys, including down hole and cross apply a DC voltage directly to pins 1 &...
- Page 7 The slot in the geophone housing limits the The geophone elements can be field replaced by any piston travel. If the piston runs against either end, reasonably skilled electronics technician. the current will increase rapidly. The system may become Astuck@ at either end, just as a screw To service the geophone elements, just follow these becomes tight at the end of its travel.
- Page 8 BHG-3 Borehole Geophone with Orientation Mechanism The BHG-3 is similar to the BHG-2, except that process is automaticC just position the geophone at its it includes a servo mechanism which will rotate desired depth and clamp the geophone in the hole.
- Page 9 To check the orientation, tap on the side of the BHG-3 near the top. Tap around the cylinder and observe which geophone is most sensitive to horizontal motion. Once the BHG-3 has been oriented, just put it in the hole and conduct the survey.
- Page 10 ORIENT Switches power to the orientation seismic data. This is also the "off" mechanism on the BHG-3 geophone. It position, since it is the only position has no function with the BHG-2 which does not power the geophone geophone. motors. Always keep this switch in...
- Page 11 The three channel-selector knobs will select amp. This will be your clue that the geophone is which channel is used for each of the geophone clamped in the borehole. Stop the motor at this point elements. By combining this capability with (by putting the switch in the RECORD position), and judicious use of the seismograph "memory pull lightly on the cable to confirm that the geophone...
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Page 12: Rechargeable Battery Option
BHGC-4 Multiple Geophone Controller The BHGC-4 is a controller with clamp and After the battery has been connected to the charger orientation switches for up to four geophones. the red LED will light up and the green LED will There are nine toggle switches to control operation go off. - Page 13 Geophone Cable The geophone cable contains two copper conductors and five conductors of copperweld, a high-strength wire. There is a Kevlar braid inside the polyurethane jacket for additional strength. The cable is connected to the borehole geophone with an underwater connector, allowing the cable and geophone to be disconnected for transit or storage.
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Page 15: Troubleshooting
Trouble-shooting Clamp Mechanism patch around a defective conductor. To use it, it is necessary to re-wire the dry end connector and the If the clamp mechanism fails to operate, isolate inside of the tool. The spare wire is green, and can be the problem by eliminating major parts of the connected in parallel with the defective conductor. - Page 16 Schematic for a user-constructed controller for a BHG-2 geophone...
- Page 17 Schematic for a user-constructed controller for a BHG-3 geophone.
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Page 18: Component View
BHG-2 Component View... - Page 19 BHG-3 Component View...
- Page 24 Standard Geophone Element Specifications...
- Page 25 Optional Geophone Element Specifications...
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