Geometrics Inc. G-882 Cesium Marine Magnetometer Page
MagLog™ can then use these equations to automatically adjust all pressure
readings to accurately reflect the depth measured.
4.6 Assembly, Installation and Use
4.6.1 Assembly of the Sensor Fish
As can be seen in Figures 54, the G−882 is assembled and ready for
deployment, as shipped. The G−882 may be deployed in a nose towed
configuration or a center of gravity (CG) towed configuration. Greater tow
depths may be obtained using the CG towed configuration. The following will
describe how to configure the G−882 for the desired to method. See section
2.6.2 in the Quick Hardware Guide for instructions on how to configure each of
these tow methods.
DO NOT substitute any other hardware (steel, stainless steel, or
anything that you may think is brass) here or anywhere else on the G−882
Magnetometer Fish. Spare hardware is supplied in the Ship Kit. All of the
supplied hardware is magnetically tested to insure that it is clean
(exhibits no magnetic signature). Failure to follow this caution could
introduce heading errors into the data that is acquired making it useless
or very difficult to interpret.
4.6.2 Installation of the G−882 Magnetometer
There are several appropriate tie points that can be used to firmly attach the
magnetometer tow cable to the vessel. Remember that the tow cable is rated
at 4,000 lb breaking strength (about 700 lbs working load) and while tension
during towing at 5 to 7 knots will be a fraction of that with the standard cable
length of 200 feet, catching the sensor fish in a net or rock will transfer that
force to the attachment point.
a. Attach the Kellems grip to a winch if you are using a substantial amount of
tow cable. We recommend a winch if the length of the tow cable exceeds 120
m (400 ft). An on-board deck cable available from Geometrics is used to
traverse the distance from the winch installation point to the logging equipment
installation site.
b. The tie point may be on the aft deck. Again an onboard cable is required to
traverse the distance from the aft deck to the logging equipment installation
place.
c. The tie point may be close to where the logging equipment is located. A
short adapter cable is provided to connect the tow cable to the DC/Data
Junction Box. An RS-232 cable will then run from the junction box to the
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