Specifications

Instruction 0024-9435
33
Fyrite Tech
O
2
Sensor Replacement
Be sure to perform all of the hecks listed in Section 4.8.9 to ensure that
the O
2
sensor needs to be replaced.
Procedure:
1. Disassemble the analyzer as follows:
a. Remove the battery cover and the batteries, uncovering one of the
cover hold-down screw.
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. Remove the battery connector from top of circuit board. Then
carefully remove the circuit board laying it face down in the top
cover.
2. Remove the O
2
sensor's electrical connector from the circuit coard.
Then push down; twist counterclockwise; and then pull the O
2
sen-
sor out of its socket (see Figure 5-3).
Tip: To obtain a better grip on the O
2
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 O
2
sensor in a proper manner (see the instruction
sheet that comes with the new sensor).
5. Mount the new O
2
sensor in its socket. If the sensor socket was
removed in Step 2, re-attach it to the case.
6. Plug the O
2
sensor's electrical connector into the printed circuit
board (observe polarity, see Figure 5-4), and then reassemble the
analyzer.
Note: A new O
2
sensor may take several hours to stabilize after being
connected to the printed circuit board.