Geometrics Inc. G-882 Cesium Marine Magnetometer Page 11
2.4 Attaching the Tow Cable to the Vessel
Each tow cable comes equipped with a Kellems grip for attaching the tow cable
to a strong tow point on the tow vessel. Slide the Kellems grip to the position on
the tow cable that will allow you to deploy the magnetometer to the desired
distance. Attach the Kellems to the tow cable by wrapping vinyl adhesive
(electrical) tape around the free end (end without the loop). The tape should be
started on the cable and lap onto the Kellems. The wrapping should be applied in
several layers as show in Figure 14. DO NOT tape along the whole length of the
Kellems; this will prevent it from working properly.
Tie the loop end of the Kellems to your vessels tow point with a strong rope prior
to casting the magnetometer overboard. The line and or hardware used for
towing should be rated to meet or exceed the 4000 lb breaking strength of the
tow cable. In addition, the tie-off point should have a similar static load rating.
Additional discussion of appropriate tie points will be found in section 4.6.2.
2.5 Powering Up the System
Connect the tow cable to the DC/Data Junction Box (via onboard deck cable if
purchased) and fix the tow cable to the tow vessel. Determine whether you will
use AC power or DC power. The AC supply will accept 120/240 VAC and there
is an adapter plug kit supplied for various international plug styles.
If you elect to supply DC power via two 12 volt batteries in series, note that a
minimum of 24VDC must be presented to the Magnetometer. Therefore 26 to
28VDC may be required at the junction box depending on cable length. Typically
fully charged batteries present about 13 volts each, and so this should function
well. Discharged batteries may not have enough voltage to start the
magnetometer although keeping it running once warmed up requires less
voltage. The DC Power Cable is provided to connect to battery power
With all of the components of a system connected, apply power by first turning
the AC supply on. There is a switch next to the mains power entry connection. If
DC power is used, hook up the batteries and DC cable. Connect to the junction
box.
Use a strong line to attach
this loop to the vessel.
To Next Page
Loading...
Need help?
General