Specifications

Instruction 24-9395
49
Fyrite Pro
5.9 O
2
Sensor Replacement (Model 110/120/125)
Be sure to perform all of the checks listed in Section 4.13.13 to ensure that
the O
2
sensor needs to be replaced.
Material Required: • Oxygen Sensor, P/N 24-8106
• #1 Phillips Screwdriver
Procedure:
1. Disassemble the analyzer as follows:
a. Remove the battery cover and the batteries, uncovering one of
the cover hold-down screws.
b. Remove and set aside all four cover hold-down screws.
c. With the analyzer on its back, remove the front cover, laying it
face down to the left of the body.
d. Carefully remove the circuit board, slipping off the battery con-
nector on top, and then laying the circuit board face down in the
top cover.
2. Slip off the oxygen sensor’s electrical connector from the circuit
board. Then push down; twist counterclockwise; then pull the oxy-
gen sensor out of its socket (see Figure 5-4).
Tip: To obtain a better grip on the oxygen sensor, it may be necessary
to remove the screw that secures the sensor socket to the case.
3. Using the old sensor as a guide, remove the paper backing from the
new sensor gasket contained in the replacement kit, and adhere it to
the new sensor.
4. Dispose of the old oxygen sensor in a proper manner (see the in-
struction sheet that comes with the new sensor).
5. Mount the new oxygen sensor in its socket. If the sensor socket was
removed in Step 2, re-attach it to the case.
6. Plug the oxygen sensor’s electrical connector into the printed circuit
board (observe polarity, see Figure 5-5), and then reassemble the
analyzer.
Note: The sensor may take several hours to stabilize after
being connected to the printed circuit board.