1. Remove the sensor unit as described in 9.2 Attach/Replacing the Sensor Unit.
2. Press back while pushing on the lower section of the main body cover with both thumbs and remove
the front panel.
3. Remove the two connectors on the back of the front panel
4. Connect the two front panel connectors to the new sampling unit and reattach the front panel. After
inserting the sensor unit, reattach the main body cover.