INTRODUCTION
| A gravity meter measures, as it's name indicate, minute variations (ppm level) in earth's gravity field. Any movement of the instrument - like those of a vessel at sea - will mask this variation. In order to eliminate effects of a moving vessel, the sensor is mounted on a two-axes gyro stabilized platform that keeps it level at all times; in addition the vessel must keep constant course and speed during measurements; also raw data is filtered in specific ways.
The gravity meter should be installed close to center of gravity of the vessel, in order to minimize roll and pitch movements.
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INSTALLATION ON RV "G.O.SARS" AND RV "HÅKON MOSBY"
RV "G.O.SARS"
CLICK TO ENLARGE
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Gravity meter and power supply (beige transport case, in the background), installed on R/V "G.O.SARS". Click to enlarge.
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Gravity meter and power supply (beige transport case, to the right), installed on R/V "G.O.SARS". Click to enlarge.
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Gravity meter, installed on R/V "G.O.SARS", frame seen from side. Click to enlarge.
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RV "HÅKON MOSBY"
WEIGHTS AND DIMENSIONS
As measured, 29 July 2016
Gravity meter S/N: S-99 frame dimensions, for foundation. Dashed line is outline of foundation on RV "Fridtjof Nansen" being built 2016. PDF version.
Must be verified
The instrument consists of two units: 1) Sensor placed in a cradle within a frame, and 2) power supply module.
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PART 1 - GRAVITY METER
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Weight (it consists of two main parts):
Frame, with sensor cradle ..........: 50 kg
+ Sensor (contained within frame) ....: 22 kg
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= Total weight gravity meter..........: 72 kg
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Dimensions, transport case for frame:
Width (front)..: 66 cm
Depth .........: 82 cm
Height ........: 73 cm
Estimated dimensions, frame:
Width (front)..: 56 cm
Depth .........: 72 cm
Height ........: 63 cm
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PART 2 - POWER SUPPLY MODULE
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Weight (it consists of two parts):
Transport case ...............................................: 22 kg
+ Power supply, 19" unit, normally used inside transport case...: 11 kg
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= Total weight power supply ....................................: 33 kg
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Dimensions, transport case for power supply:
Width (front)..: 78 cm
Depth .........: 58 cm
Height ........: 26 cm
POWER REQUIREMENTS, CONSUMPTION
Input voltage ...........................: 87 - 270 Vac, 47 - 400 Hz
Power consumption, system in operation ..: 391 Watt (1.7 A @ 230 Vac)