Enter this run in the log book. Replacing the Sensor Crystal Pull the metal ring out of the top of the sensor unit. Pull the metal piece out of the back of the metal ring. Remove the sensor crystal. Put the new sensor crystal in with the white side facing the hole in the metal ring.
Extra crystals are in the drawer in the desk on the left side of the filament evaporator.
Put the metal piece back into the metal ring so that the contacts are against the patterned side of the crystal. Put the crystal holder assembly back into the sensor head. Throw the old crystal away. It should be located in the drybox with the other substrate holders. The dome, small sample holders, and the platform the dome sits on are stored in the cabinet near the doorway, opposite the drybox.