Bore Hole Gradiometer Instruction Manual
Table of Contents Features........................................................................3 Controls Description....................................................4 Display Description .....................................................5 Function .......................................................................6 Operation .....................................................................7 Connections .................................................................8 RS-232 Interface.....
Features ◊ Standard unit with internal battery housed in a high impact ABS case. ◊ Included accessories: • Manual • Wall transformer for recharging battery • Rechargeable sealed lead acid battery (internal) • 12 Volt auxiliary power cable • RS-232 Cable • 30’ Sensor cable ◊ Accessories store in compartment in lid. ◊ Electronic control unit. ◊ Titanium encased waterproof Sensor . ◊ Waterproof optional cables available: 50’, 100’ Other lengths special order.
Controls Description 1. ON.......................................................................... Power ON 2. OFF...................................................................... Power OFF 3. Volume ...............................................Raise or lower volume 4. Gain ............Increase or decrease gain from .3mG to 100mG 5. Zero ...................................Manual adjustment of zero offset 6. Auto Zero............. Automatic adjustment to “NULL” output 7. Battery Check..............
Display Description 1. Bar Graph (top)..............Shows signal strength and polarity 2. BATT Icon .................. Flashes when battery needs charging 3. Numeric output ............ Indicates signal value in Milligauss ................................................. dependent upon range setting, ................................................or battery voltage when BATT ...................................................... CHECK button is pressed. 4. Bar Graph (bottom)..........
Function The BoreHole Gradiometer (BHG) responds when the magnetic field strength measured at the two sensor elements inside the Sensor housing are different. This difference is measured in “Differential Milligauss” and is reported to the user via the LCD display and the audio speaker. A headset may be used in noisy environments and will disable the speaker when connected. The RS-232 interface allows control and recording using a personal computer with a serial COM port.
Operation Connect the sensor to the electronics using the sensor cable before turning the system on. Press the green ON button to turn on the BHG . To turn OFF press the red OFF button. The RS-232 interface cannot be used to turn the BHG on or off. To check battery condition press the BATT CHECK button and the battery voltage will display on the LCD. Place the sensor in the water using your towing arrangement.
Connections The headphone jack has a water resistant cover. Lift open to plug in a stereo phone plug to listen with a headset in noisy environments. Replace a blown fuse with a 1/4 amp slow blow. Use the included RS-232 cable to connect the MUL to a computer. To run on external power or to charge the battery in the field, connect the external DC power cable to the POWER connector. Connect the other end clips to a 12 to 15 Volt DC power source. Red to positive and Black to negative.
RS-232 Interface COM Port settings: Baud rate Bits Parity Stop bit Flow Control 9600 8 NO 1 None Program: Use Hyper Terminal or custom software to communicate. Turn off echo. The unit will echo any character it receives to verify communication.
Maintenance Keep the unit as clean as possible, especially the Electronics keypad panel. Do not use an abrasive cleaner on the keypad overlay or the LCD lens. The Titanium encased sensor has no user serviceable parts. In the event of a failure, the sensor should be returned to the factory at the address listed at the end of this manual. The battery and charging circuit are located inside the electronics unit and should not need servicing for quite some time.
Specifications Controls: ON, OFF Volume UP and DOWN Range setting (Gain or Sensitivity) UP and DOWN Zero, Plus and Minus Auto Zero - Automatic self-adjusting Battery Check Outputs: Audio Frequency pitch (Speaker & jack for headset) Visual LCD Display Bar graph - Range GAIN setting - Milligauss RS-232 PC connection (cable included) Control all keypad functions Data log range, keypad & signal settings Works with hyper terminal or equivalent Power Options: Internal battery: Battery Life: 12 volt, 7.
Included Accessories Wall Transformer Serial Port Cable 12 Volt Power Cable Sensor Cable 12
Warranty Statement SubSurface Instruments, Inc. warrants the BHG-1 to be free from defects in material and workmanship for a period of twelve (12) months from date of shipment to original purchaser, subject to the following conditions. Our obligation under this warranty is limited to servicing or adjusting any product returned to the factory for this purpose, and to replace any defective part thereof.
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SubSurface Instruments, Inc. 1841-C Plane Park Drive De Pere, WI 54115 PH: 920-347-1788 FX: 920-347-1791 www.ssilocators.com Email: info@ssilocators.
