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Oceanic Systems


Oceanic Systems 3281 Network Water Senders

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The 3281 NMEA 2000 Universal Water Tank Sender will provide a 2% accurate level in either a Fresh, Grey or Black water tank to an NMEA 2000 marine network and reports its level in 1% increments. It is robustly constructed in stainless steel with no moving parts to stick or fail in service. It is easily cut to length to suit tank depths from 200mm to 2 meters and is self calibrating at power on. The Tank Level Sender can store an alphanumeric Tank Name and Tank Shape Calibration data so that displays on the network can show the tank name and its remaining capacity in liters or US gallons. The 3281 is made for a tank with a 1.25" BSP fitting. Customers in the USA should use the 3261 adapter for an SAE 5-bolt tank.

Up to 16 of each type of water tank level senders can be connected to a single network and the tank type and sender number are selectable at installation by means of the small rotary switches. The sender connects to the network through the attached 1 meter drop cable. Power for the unit comes from the network (LEN = 1).

Available Versions

  • 3281-500 : for tank depth 250-500mm (9.8-19.7")
  • 3281-1000 : for tank depth 500-1000mm (19.7-39.4")
  • 3281-1500 : for tank depth 1000-1500mm (39.4-59.1")
  • 3281-2000 : for tank depth 1500-2000mm (59.1-78.7")

This item is for water tanks only - do not use for gasoline or diesel tanks.