SENSOR REPLACEMENT
1. Turn the 3-WAY SELECTOR Valve to the OFF position.
2. Remove the CELL CAP by turning it counterclockwise.
3. Remove the expired sensor.
4. Open the bag containing the new oxygen sensor. (Note: do not remove the stainless steel
shorting clip yet)
5. Using the plastic handle, quickly install the sensor into the sensor pocket and carefully push
it all the way to the back.
6. While holding the sensor in place, pull out the stainless steel shorting clip.
7. Blow and use your hand to fan air into the sensor pocket.
8. Allow the measurement reading to stabilize for a few seconds.
9. Press the SPAN Button and release. The word SPAN will appear on the LCD for 1 second and then
display the oxygen reading, while the % FLAG blinks. Quickly press the appropriate UP/DOWN
ARROW to adjust the LCD reading to 20.9%.
10. Quickly replace and tighten the CELL CAP by turning clockwise until 'hand-tight'.
11. Rotate the 3-WAY SELECTOR VALVE to the SAMPLE position and allow sample gas to flow.
12. Adjust the flow rate to ~ 1.0 SCFH.
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