X3 Logger Desiccant Replacement

Each X3 Environmental Data Logger ships with a silica-gel desiccant pack mounted underneath the top enclosure. The desiccant is an important component in the logger enclosure to keep the internal humidity low. High humidity can adversely impact or damage the electronics. Replace desiccant packs any time the X3 enclosure is opened or if the internal humidity reading is greater than 50%.

For replacement, desiccant packs are available through NexSens or a local provider. NexSens uses Silica Gel Desiccant Bags for 235 Cubic Inches that are 2.8″ L x 1″ W.

Desiccant Replacement

Disconnect the logger from all power sources before replacing a desiccant pack. Statically ground yourself prior to and while contacting any of the electronics inside the logger. Failure to do so may result in a static discharge that can be harmful to the electronics.

  1. Remove the green wire from its track at the base of the data logger’s aluminum housing.
    1. Apply downward pressure on the top bulkhead while removing the wire, as air pressure inside the bulkhead may be pushing upward, making it difficult to remove. If needed, tweezers or needle-nosed pliers can be used.
    2. The middle port plug can also be removed to relieve some of the built-up pressure.

Figure 1: Remove the green wire holding the top bulkhead.


  1. Gently pull up on the top bulkhead to separate it from the data logger’s base.
    1. The data logger circuitry should now be exposed. Be cautious of the cables still connecting the top bulkhead and the electronics.

Figure 2: Separate the top bulkhead.


  1. Remove the current desiccant pack taped underneath the top bulkhead and replace it with the new desiccant in the same position.

Figure 3: Install a new, fresh desiccant pack.


  1. Re-install the top bulkhead while aligning it with the blue set screw.
    1. Remove the middle port plug underneath the logger to push any air pressure out of the bulkhead during re-installation.
    2. Be careful not to pinch any wires during re-installation.
    3. If available, apply a light layer of O-ring grease on the O-ring.

Figure 4: Orient and re-install the top bulkhead.


  1. Re-install the green wire while keeping slight downward pressure on the top bulkhead.
    1. When fully installed, a small piece of the green wire should overlap the entry point for easy access in the future.

Figure 5: Re-install the green wire.


  1. Review the internal humidity readings on WQData LIVE. Ideally, the internal humidity will stabilize under 20%; however, humidity levels will be dependent on the environmental conditions.