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.

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.

A71 desiccant kit.

Desiccant Replacement Process

  1. Disconnect the 6-pin solar panel or UW-6 USB cable from the X2-CB SOLAR/COM port to remove power from the data logger.
  2. Remove the buoy solar tower to gain access to the data well [CB-150/250/450 buoys only].
    1. Remove the (6) bolts with lock washers securing the solar tower using a 9/16″ socket wrench.

Remove CB-150/250/450 solar tower.


  1. Remove the (8) bolts with lock washers from the X2-CB using a 9/16″ socket wrench, loosening them in a cross pattern.

Loosen X2-CB plate.


  1. Pick up the plate to reveal the 6-pin plug connecting the battery harness in the data well to the bottom cable of the X2 logger. Disconnect and protect the connectors with cap covers or tape.
  2. Remove the screws holding the X2 enclosure to the metal plate using a Phillips head screwdriver.

Remove X2-CB housing screws.


  1. Lift up on the enclosure base to separate it from the logger plate.

Lift up on the enclosure base.


  1. Remove the spent bag of desiccant and place a fresh bag in its place.

Replace desiccant bag.


  1. Carefully set the enclosure base back on to the logger plate, aligning the threaded inserts of the plate with the screw holes in the base.
    1. Ensure the large exterior O-ring is secure in the grooves of the base and is making proper contact with the bottom of the logger plate.
    2. Verify that when closed the power cable feeding up through the enclsoure base lies flat and is not pinched when closed.

Ensure the power cable will not be pinched and that the O-ring is seated properly.


  1. Thread the screws on to the housing about halfway, before tightening them in a cross pattern with a Phillips screwdriver.

Replace the housing screws, tightening evenly in a cross-pattern.


  1. Set the re-assembled X2-CB back on top of the data well, placing desiccant in the well first.

Install desiccant and reattach data well plate.


    1. It is recommended at this time, particularly if the X2 has reported high moisture readings, to replace the bag of desiccant inside the data well also.
    2. Make sure the primary O-ring is clear of debris and centered in the groove.
    3. Reconnect the 6-pin plug on the bottom cable of the X2 logger to the battery harness cable in the datawell.
    4. Align the plate and re-install the (8) bolts with lock washers, tightening them in a cross-pattern using a 9/16″ socket wrench.

Tighten bolts in a cross-pattern to ensure even load distribution.