Combustion Analyzer Operating and Maintenance Guide
Combustion analyzers measure oxygen, carbon monoxide, carbon dioxide, nitrogen oxides, and flue gas temperature to calculate combustion efficiency. They are essential tools for optimizing fuel economy and reducing emissions.
I. Operating Procedures
- Pre-Test Check: Verify the water trap and particle filter are clean and dry. Check that the probe and hose connections are tight.
- Instrument Startup: Turn on the analyzer in fresh air to allow proper sensor zeroing during the startup purge cycle. Never start the analyzer in the flue gas stream.
- Probe Insertion: Insert the probe into the flue at the recommended measurement point, typically in a straight section of flue at least two flue diameters downstream from any bend.
- Stabilization: Allow readings to stabilize before recording. This typically takes two to three minutes.
- Efficiency Calculation: The analyzer calculates combustion efficiency based on flue gas temperature, net stack temperature, and excess air. Record all relevant parameters.
II. Maintenance
Daily
- Empty and clean the water trap after each use
- Check the particle filter and replace if discolored
- Wipe down the probe and hose assembly
Weekly
- Inspect the probe tip for soot buildup or corrosion
- Check the thermocouple for damage
- Verify hose integrity; replace if cracked or leaking
Annually
- Replace oxygen and carbon monoxide sensors
- Send for professional calibration and certification
- Replace the particle filter and water trap O-rings
III. Troubleshooting
Oxygen Reading Too High: Check for air leaks in the probe, hose, or connections. Verify the water trap is properly sealed.
Carbon Monoxide Reading Erratic: Check for condensation in the sampling system. Replace the particle filter. Verify the sensor is not at end of life.
Instrument Will Not Zero: Ensure startup is in clean air. Check for sensor poisoning or depletion. Replace sensors if necessary.
