Prerequisites
A sound speed sensor is available. The sound speed sensor is connected to the MS70 Processor Unit. For connections and communication parameters, see the relevant end user documentation from the sensor manufacturer.
This procedure assumes that:
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The vessel is berthed or at sea. |
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You have a vacant interface port on your Processor Unit. |
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You are familiar with NMEA and other relevant datagram formats. |
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You know how to set up the parameters for serial and local area network (LAN) communication. |
You must be equipped with a standard set of tools. This tool set must comprise the normal tools for electronic and electromechanical tasks, such as screwdrivers, pliers, spanners,
a cable stripper etc. Each tool must be provided in various sizes. We recommend that all tools are demagnetized to protect your equipment.
Context
A dedicated sensor is used to measure the sound speed in the water. The sensor measures the temperature and/or the salinity, and this information is used to calculate the sound speed. Sound speed sensors may be used in two different ways; fixed or deployed.
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A fixed sound speed sensor is positioned close to the transducer. The sensor is normally a permanent installation, but many vessels have designed a method to lower and hoist the sensor. This allows it to be "installed" only when required for measurements. The sound speed sensor connects to the Processor Unit. This is normally done with a serial line. In the MS70 user interface, the sound speed sensor if often referred to as a probe.
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The deployed sound speed sensor, frequently referred to as a CTD (conductivity, temperature and depth) sensor, is lowered into the water to make measurements at certain depth intervals. After use, the sensor is connected to a computer, and the measurements are transferred to a data file. Once the information has been collected, it is transferred to the Processor Unit on a suitable medium. The information from a CTD (conductivity, temperature and depth) sensor is normally referred to as a profile.
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The supported datagram formats are listed in the Technical specifications chapter.
Procedure
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Connect the sound speed sensor to the Processor Unit using a serial line cable.
This is described in the Cable layout and interconnections chapter.
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Observe the applicable requirements related to cabling. |
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Ensure that the total length of the serial line cable does not exceed approximately 50 meters. If a longer cable is required, you may need to use buffer amplifiers. |
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If the Processor Unit is not fitted with a suitable serial line connector, use a USB-to-serial converter. Several types are commercially available. |
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On the sound speed sensor, connect the cable as described in the instruction manual provided by the manufacturer. |
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Local connection on the Processor Unit |
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Connection on sound speed sensor Refer to the manufacturer’s documentation for plug type and pin numbers.
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Turn on the MS70, and set it to normal use.
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Open the Operation menu. |
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Set Operation to Normal. |
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Set Ping Mode to Interval. |
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Set Ping Interval to 1 s. |
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Set TX Power to Maximum. |
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On the Setup menu, select Install.
Observe that the Install submenu opens.
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Select Sound Velocity Port to open the dialog box.
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Set up the interface.
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Select the Ethernet or serial port you wish to use. |
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Set up the relevant port parameters. |
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Select OK to save the chosen settings and close the dialog box. |
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On the Setup menu, select Install.
Observe that the Install submenu opens.
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Select Environment to open the dialog box.
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Open the Transducer Face page.
The sound speed close to the transducer face is an important parameter for maximum accuracy. You can define the sound speed at the transducer manually, or retrieve the information from a dedicated sensor.
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Select Probe.
By selecting Probe, the sound speed values from the sensor close to the transducer face are received. The information is then included in the
raw data files.
TipProbe Port Setting provides you with a short-cut to the Sound Velocity Port dialog box.
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Select OK to save the chosen settings and close the dialog box. |