Borehole Surveying Tools Gyroscopic Survey Tools North Seeking Gyro Survey Inclinometer Magnetic Survey Tool Gyroscopic Inclination Tool
GDY-2GW Fiber Optic North Seeking Gyro is a Inclinometer which can measure azimuth correctly in the case section. It is operated by a portable controller and survey at each station by pre-set time interval.
The GDY-2GW is an easy to use and multi-shot tool. It is based on the best quality Fiber Optic Gyro technology. The tool measures the self-rotation of the earth where the tool is placed at to indicate the True-North angle. The adapter with an ID number "420xxx" is used to connect a steel wire and slowly lower it down the hole. There is no switcher on the probe so you don't need to disassemble GDY-2GW during the whole measuring process. Once being assembled with the battery housing, the GDY-2GW will 5 automatically start to work. The probe is powered by a 7.4V rechargeable lithium battery, which can be charged no less than 500 times. The endurance of the survey tool is about 20 hours.
There are several ways to measure the deviation of boreholes, and what method that is best for you depends on what sort of borehole you have.
But for all boreholes we want to place the survey tool at a given depth, called a survey station. At that survey station we want to make a measurement, sometimes called a survey shot, to get the azimuth and inclination. The azimuth and inclination, together with the depth are used to calculate the borehole trajectory.
Inclination: 0°stands for vertical; Azimuth: GDY-2GW finds the True North which is the direction along a meridian towards the geographic
North Pole.
The True North is different from the Magnetic North and there is an angle between the two orientations called magnetic declination.
Magnetic declination or variation is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the Earth's magnetic field lines) and true north. This angle varies depending on position on the Earth's surface, and changes over time.
By convention, declination is positive when magnetic north is east of true north, and negative when it is to the west.
| 1.Inclination Range 0° - 50°(Resolution 0.01°) Accuracy ±0.1° |
| 2.Azimuth Range 0° - 360°(Resolution 0.1°) Accuracy ±2°(@Inclination>4°) |
| 3.Pressure Normal: 20MPa |
| 4.Dimenisions Ø40mm×1400mm Weight about 7.5Kg |
| 5.Temperature Normal:-10°C - 70°C With thermal shield: -10°C- 120°C |
| 6.Power (Probe) 7.4V Rechargeable Battery Endurance about 20 hours (Fully charged) |
| 7.Power (Controller) 2600 mAh Polymer Battery |
| 8.Self test time 30 seconds (For better accuracy, warm up the probe for at least 5 minutes) |
| 9.Survey time less than 2 minutes (must be in a static environment) |
| 10.Depth 2000m |
| 11.Storage 8GB ROM |
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