Hull Unit Control dialog box
The Hull Unit Control dialog box allows you to lower and hoist the transducer. The dialog box also provides status information about the transducer position. You can monitor the current position of the transducer and make changes to the position defaults.
How to open
To open the Hull Unit Control dialog box, select Hull Unit on the top bar.
Image
Description
To lower the transducer select Down. To hoist the transducer select Up. To move the transducer to its predefined middle position, select Middle.
The numerical value shown in the Hull Unit Control dialog box measures the vertical travelling distance. It stops when the transducer reaches the middle position, and shows you the vertical distance. It stops when the transducer is fully lowered, and shows you how far down this is. It stops when the transducer is fully retracted, and shows you that the vertical distance is 0 (zero).
Tip
Retracting the transducer to a middle position may be useful if you use the ST90 system simultaneously with other sonars. A higher position will permit you to increase the vessel speed. If you operate in very shallow waters, you may also reduce the risk of hitting bottom. However, placing the transducer immediately under the hull may increase the flow noise.
If you have a very large hull unit you can define two middle positions.
Tip
The Middle button on the Operating Panel can only be used to lower or hoist the transducer to the initial middle position. If you want to place the transducer in position "Middle 2" you must use the Hull Unit Control dialog box.
The ST90 system can be provided with one of the following hull units:
Hull Unit Lowering depth (m) Transducer cable (m) Maximum speed (knots)
ST92 1.2 4.6 16
7
ST93 1.6 4.6 16
7
ST94 2.1 4.6 11
7
The same transducer is used on all hull unit types.
If a Hull Unit Controller is supplied with the system, the Motor Control Unit cabinet is used as a junction box.