6. Separate the case by gently
pressing up on the front
housing with pulling the top
apart.
7. Lift the main circuit board up
and away from the instrument.
a. Be careful of the wiring
harness that powers the pump
and connects to the battery
compartment.
8. Place the instrument on a flat
surface with the circuit board
positioned as shown.
9. Remove the four screws
holding the sensor cover
in place.
10. Remove the sensor cover.
11. Lift the sensor to be replaced
out of the manifold.
a. Sensor located at the top is
O2, and the bottom
position is CO.
5. Remove the two screws
securing the case halves
together.
4. Remove the batteries.
1. Tools required to replace the
sensor include a standard
Phillips screw driver and a
source of calibration gas.
2. Remove the protective boot
from the instrument.
3. Remove the water trap by
sliding down and then away
from the housing.
S
ENSOR
R
EPLACEMENT
