The NexSens MB-100 data buoy ships fully assembled. Common accessories such as the SDL500 data logger and single point mooring hardware may require some user assembly.

The buoy hood must be removed to get started. To do this, loosen and remove the three threaded nuts that secure the hood to the frame. Use the 3/16” handled Allen wrench provided with the SDL maintenance kit for additional leverage if necessary.


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Figure 1: Removing a threaded nut from the MB-100 to allow for hood removal


After removing the threaded nuts, simply lift the hood off of the hull to gain access to the central buoy well. This is where the SDL500 data logger can be installed.

Pre-deployment Test

Prior to deployment, it is essential to test the monitoring system (sensors, data logger, and telemetry) on shore. This will allow users to familiarize themselves with the system and confirm proper operation.

Power the Data Logger

These instructions apply if the project is using a NexSens SDL500 with cellular, radio or satellite telemetry. Unthread the battery lid from the SDL500 communication bulkhead. Insert eight D-Cell alkaline batteries into the data logger. Note the correct polarity shown on the labels just inside the battery tubes. See the appropriate SDL500 category for additional information. Note Duracell batteries should be used and that the SDL500 is equipped with reverse polarity protection. No damage will occur if the batteries are inserted incorrectly.



Figure 2: Installing batteries in the SDL500


Install the Data Logger

Remove the orange rubber o-ring from the bottom (gray) end of the data logger.


SDL500 with bottom orange o-ring removed

Figure 3: SDL500 with Bottom Orange O-ring Removed


Insert the SDL500 into the central well of the data buoy so that the white battery lid is on the topside of the buoy.



Figure 4: SDL500C cellular data logger with antenna shown inserted into MB-100 central buoy well

Connect Sensors

To facilitate sensor connections, the bottom guard should be removed using the 3/16” Allen wrench supplied in the SDL maintenance kit.


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Figure 5: Removing bottom guard from SDL500 data logger using 3/16″ Allen wrench


Connect sensors to the SDL500 sensor bulkhead. Refer to the appropriate SDL user manual and sensor interface manuals for additional information including port recommendations. Be sure to route the sensor cables through the guard prior to connecting to the SDL sensor bulkhead.


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Figure 6: SDL500 with Bottom Guard Removed and Sensors Connected


Reconnect the guard to the SDL500 data logger.

Confirm Data Collection & Transmission

Launch iChart software and confirm that the SDL500 and sensors are communicating properly. Refer to the appropriate data logger and iChart categories for additional information as required.

The pre-deployment check is complete. The buoy, data logger, and sensors can now be prepared for deployment.


REV: 13C05

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