04 Series for CO(-H2)
Chapter 6: Maintenance • 71
Replacing the Hydrophobic Filter
1. Verify that the CO-04C is off.
2. Remove the rubber boot, if installed.
3. Use a small Phillips screwdriver to unscrew the 4 screws that attached the front case to the
rear case.
4. Turn the instrument right side up. The screws are not captive and may fall out. Be sure not
to lose them.
5. Remove the front case from the rear case.
6. Turn the front case upside down.
7. If the sensor stayed in the front case, remove the sensor.
8. Carefully remove the sensor gasket and the black charcoal filter that sits in the middle of
the sensor gasket.
Figure 14: Unscrewing Case Screws
Screw, 4x
Front Case
Rear Case
Figure 15: Case Separation
