Replace Desiccant

Each X2-CB/X2-CBMC ships with a bag of desiccant inside the logger enclosure. This desiccant bag should be replaced whenever:

  1. The X2-CB/CBMC enclosure is opened.
  2. The Internal Humidity diagnostic parameter reads 50% or greater.

Figure 1: X2-CB data logger.


Caution!!!- Be sure to statically ground yourself prior to touching any of the electronics inside the X2 logger!


Any appropriately-sized silica gel desiccant pack (the included pack is 6″x  1.5″ for reference) or the NeSens A71 desiccant kit can be used for replacement.

Figure 2: A71 desiccant kit.


Desiccant Replacement Process

  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 3: X2-CB port configuration.

Figure 4: 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 5: 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 6: X2-CB removal from CB-150/250/450 buoys.

Figure 7: X2-CB removal from CB-650/950/1250 buoys.


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

Figure 8: Unplug X2-CB in CB-150/250/450 buoys.

Figure 9: Unplug X2-CB in CB-650/950/1250 buoys.


  1. Invert the logger plate and remove the (8) 8-32 x 1/2 screws holding the X2 enclosure to the metal plate using a Philips-head screwdriver.
    1. Gently lift the enclosure to expose the RTU PCB of the X2. Statically ground yourself prior to touching any of the electronics inside the X2 logger.

Figure 10: Remove the X2-CB/X2-CBMC housing screws.


  1. Disconnect the 4-pin Molex connector between the enclosure and the X2 data logger.

Figure 11: Disconnect the Molex power connector.


Replace the desiccant and re-assemble the X2-CB Housing

  1. Realign the O-ring within the grooves on the bottom of the X2-CB/X2-CBMC enclosure.
    1. Place the desiccant on the RTU board next to the modem.
    2. Orient the X2-CB/X2-CBMC enclosure such that the power cable feeding up through the bottom of the base lies flat when closed and is not above the cellular modem.

Figure 12: Re-align the O-ring and ensure to replace the desiccant.

Figure 13: Reconnect the Molex power cable.


  1. Align the holes on the enclosure with the threads on the plate. Ensure the large exterior O-ring is secure in its grooves and is making proper contact with the bottom of the logger plate.
    1. Thread the (8) 8-32 x 1/2 screws in halfway before tightening in a cross pattern with a Phillips Screwdriver.

Figure 14: Re-install the X2-CB-X2-CBMC enclosure.

Figure 15: Evenly tighten the screws in a crisscross pattern.


  1. Place the re-assembled X2-CB/X2-CBMC back on top of the data well.
    1. Ensure the primary O-ring is clear of debris and centered in the groove.
      • It is recommended to replace the desiccant pack within the data well at this time.
    2. Reconnect the 6-pin plug on the bottom cable of the X2 logger to the battery harness cable.

Figure 16: Re-connect the data well 6-pin cable connection.


  1. Align the plate and re-install the (8) bolts with lock washers, tightening them in a cross-pattern using a 9/16″ socket wrench.
    1. Orient the SOLAR/COM port towards one of the deployment tubes for easier access when the solar tower is installed.
    2. Ensure there are no substantial gaps between the data logger plate and the metal frame of the buoy data well.

Figure 17: Bolt down the X2-CB/X2-CBMC.

Figure 18: Bolt down the logger in a crisscross pattern.