Replacement Procedure

The following procedure can be used to replace the desiccant on all of Pyramid's ion chamber products that feature user-serviceable replacement.

Tools required:

  • 2.5mm Allen Wrench
  • PH1 Phillips Head Screwdriver

Preparing the Ion Chamber

Disconnect and dismount the ion chamber from the beamline and carefully place it connector-side down on a clean, soft surface.

Cover the windows with protective paper or cardboard to prevent unintentionally puncturing them.

Prepare the Replacement Parts

Locate the desiccant replacement package. Ensure the contents have not expired by observing the date on the label, once the package has been opened, observe the humidity indicator card inside.

Do not open the bag until you are ready to place the new desiccant in the ion chamber.

Alternatively, you may have received an entirely new mounting panel including fresh desiccant packets. If that is the case, remove the outer packaging, but do not open the inner packaging until later.

Remove the Desiccant Panel

To replace the desiccant, you must first remove the ion chamber's desiccant panel, which contains all of the desiccant packets.

Locate the Desiccant Port Cover on the Ionization Chamber. In most cases it will be annotated on the decal.

Desiccant panel on IC

The desiccant is inside the thicker of the two panels. Remove the panel using a 2.5 mm Allen key. Start by slightly loosening each M3x8 screw in a rotary pattern, then keep working around the pattern until the screws are loose. Remove all the screws and place them somewhere safe.

Carefully remove the panel. Place it on the table with the desiccant cavity facing upwards. If you are replacing the entire pre-mounted panel, remove it from its packaging and skip to installing the panel instructions.

Replacing the Desiccant in the Panel

Remove the cover mesh, retaining the screws and lock washers.

Desiccant Panel with Mesh

Remove the old desiccant packets and discard them. Open the sealed replacement bag and place the new packets in the panel. Make sure that the packets are clear of the mounting surface and replace the cover mesh. Replace the screws and lock washers, tightening securely.

Wipe the “O”-ring and “O”-ring mating surface with a clean lintless wipe. This will ensure a good seal on the chamber.

Reinstall the Desiccant Panel

Place the panel back on the IC, the panel is symmetric and can be oriented in either direction.

Replace the mounting screws, and lightly tighten. In a rotary pattern, gradually tighten the screws until secure.

Reinstall the Ion Chamber

Mount the ion chamber back in its position in the beamline and reconnect all the corresponding cables.

Monitor environmental conditions and do not run the beam or turn on high voltage until internal humidity is below 10%. Permanent damage may occur