Remove an X2-CB for repair

If an X2-CB data logger needs to be sent in for evaluation or repair, please reference the following steps for removal:

Figure 1: X2-CB data logger.


Tools Required

  • 9/16″ Socket Wrench



  1. Disconnect the 6-pin solar panel or UW-6 USB cable from the X2-CB/X2-CBMC SOLAR/COM port to remove power from the data logger.

Figure 2: X2-CB port configuration.

Figure 3: X2-CBMC port configuration.


  1. [For CB-150/250/450 buoys only] Use a 9/16″ socket wrench to remove the (6) bolts holding the buoy’s solar tower to access the data well.

Figure 4: Remove solar tower from CB-150/250/450 buoys.


  1. Remove the (8) bolts from the X2-CB/X2-CBMC using a 9/16″ socket wrench.

Figure 5: X2-CB removal from CB-150/250/450 buoys.

Figure 6: X2-CB removal from CB-650/950/1250 buoys.


  1. Lift up the logger and then disconnect the 6-pin plug connecting the battery harness to the bottom cable of the X2 logger.

Figure 7: Unplug X2-CB in CB-150/250/450 buoys.

Figure 8: Unplug X2-CB in CB-650/950/1250 buoys.


  1. Pack with plenty of protective material and ship the X2-CB to NexSens as directed by NexSens technical support.
  2. For deployed systems, it is necessary to protect the data well and system batteries while the logger is under evaluation. In most cases, NexSens will provide a blank plate to maintain a water-tight seal.
  3. Inspect the large O-ring on top of the data well.
    1. Clean any debris that may have accumulated on top.
    2. Inspect for any tears or abrasions on the O-ring surface, replacing if damaged.
    3. Ensure proper lubrication of the O-ring. Use grease from the buoy maintenance kit as needed.
  4. It is recommended a new bag of desiccant be inserted into the data well at this time.
  5. Install the blank plate.
    1. Place the blank plate over the top of the data well and align the holes.
    2. Re-install the (8) bolts with lock washers from the X2-CB or data well pass-through plate using a 9/16″ socket wrench, tightening them evenly in a cross pattern to ensure an even O-ring seal.

Figure 9: Bolt down the X2-CB/X2-CBMC.

Figure 10: Bolt down the logger in a crisscross pattern.


  1. Ensure that all sensor port receptacles on the blank CB plate are occupied with a hand-tightened dummy plug or a sensor cable plug from any of the deployed sensors. Additionally, verify each plug and receptacle have a clean O-ring.