
348 GAS ANALYZER
MAINTENANCE SCHEDULE
ZEROING O2S (OXYGEN) SENSOR
Zeroing the oxygen sensor manually is only required if, while reading
calibration gas, the oxygen reading is not within 00.0% ± 0.2%. (See
Section Calibration Verification on page 353.)
1.Select 4 (Zero Oxygen) from the <MAINTENANCE> menu.
2.Disconnect the cable from the oxygen sensor.
3.If the sensor will not zero, repeat the test.
4.If the sensor continues to fail, the sensor may need replacement or
the Gas Analyzer may have a hardware problem.
5.Reconnect the cable to the oxygen sensor.
COMPONENT INTERVAL OPERATION
Sample Filters Daily Inspect and replace if dirty
Drain Filter Daily Inspect and replace if dirty
Leak Test Daily Test
Check Valve Every 2 weeks Clean
Air Filter Weekly Clean
Gas Calibration 4 weeks or as required Calibrate
Sampling Hose Software indicates Low
Flow or HC hang-up
problem
Clean
Oxygen Sensor Replace Approx. 1 year. Software
indicates replacement.
Replace
NO
X
Sensor Approx. 2 years. Software
indicates replacement.
Replace
O
2
SENSOR
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