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Instruction 24-9351
PCA
6.6 Replacing the Oxygen Sensor
Replace the Oxygen Sensor when it has expired (when the analyzer’s
automatic O
2
calibration fails and the unit displays the message “O2-
Sensor Error”).
NOTE: A "O2-SENSOR ERROR" displayed in the Sensor
Status Screen does not necessarily mean that the sensor has
expired. Before replacing the sensor, refer to Section 7.2 for
other possible causes of the error.
Equipment Required:
• Small Flat Blade Screw Driver
• Oxygen Sensor (Refer to Section 8.0)
Procedure:
1. Remove the analyzer’s rear case and lay it aside (refer to Section 6.2).
2. Remove the Oxygen Sensor connector from the printed circuit board;
then carefully pull off the two wires connected to the pins of the
sensor (see Figure 6-2).
3. Push in and turn the sensor counterclockwise (watching the notch on
top) until it stops; then pull the sensor out of its housing.
4. To install a new sensor, push the sensor into the housing and turn it
clockwise until it locks in place.
5. Connect the black (–) and red (+) wires, which were removed from the
old sensor in Step 2, to the pins of the new sensor. Be sure to observe
polarity as marked on the sensor.
6. Reinstall the sensor connector onto the printed circuit board.
7. Reassemble the analyzer. Then allow the sensor to be connected in
the circuit for at least 1 hour before continuing.
8. Place the analyzer in an area of fresh air and turn it ON. After the
warmup cycle, observe that the Sensor Status Screen should not show
an O
2
sensor error.
6-7
Maintenance