Geometrics Inc. G-882 Cesium Marine Magnetometer Page
Take the two replacement O-rings provided in the ship kit and apply some
silicon grease provided in a small circular, snap-lid container in the ship kit.
Take a little grease between your thumb and index finger. Gently pull the
circumference of the O-ring between your greased fingers to thoroughly apply a
complete layer of grease to the O-ring. Gently stretch the O-ring over the
small end of the bulkhead and slide it into one of the O-ring grooves. Repeat
this process with the second O-ring and place it in the other O-ring groove of
the bulkhead. Take a little more grease on your index finger and wipe it on the
circumference of the O-rings on the bulkhead.
Install the bulkhead into the magnetometer fish. Push the bulkhead straight in
to insure proper installation.
5.3 Depth Sensor Ratings
There are four choices for a Depth Sensor that may be installed in a G−882.
They are: none
100psi
250psi
500psi
These depth(pressure) sensor(s) will operate to 200% (for a 100psi sensor this
would be 200psi) over pressure without damage or the calibration change.
Exceeding 200% may cause a permanent change in the calibration as the
sensor is permanently deformed. Sensor failure to produce data may occur if
200% over pressure is exceeded.
These depth sensors are safe from bursting up to 400% over pressure with out
bursting. The pressure sensor will be useless after this over pressure but it
should not burst protecting the magnetometer from flooding. The pressure
sensor will not burst at exactly 400% over pressure and may survive higher
pressure without bursting. However, if pressure is approaching 400%, every
effort should be immediately undertaken to prevent the G−882 from going
deeper to prevent bursting of the depth sensor.
5.4 Tow Cable Strength Data
Recent design changes have made a stronger tow cable available. Data for
both the "original" and the "new" cable are provided for those who may have
the original cable with a magnetometer previously purchased from Geometrics.
Original Tow Cable
Color: black
Marking: GEOMETRICS, INC., P/N 60-453-095
Breaking Strength: 4000 lbs.
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