Overview of tail gas analysis in sulfur recovery units (Claus process) .

| Symptom | Likely cause | Action | |--------|--------------|--------| | Drifting reading | Dirty cell / contaminated filter | Clean optical bench per manual | | No flow | Blocked inlet or exhausted pump | Check filters, replace pump diaphragm | | Span fails | Expired span gas / wrong concentration | Verify gas, recalibrate | | Low sensitivity | Detector aging / window fogging | Contact Ametek service |

Without the official , users risk misinterpreting signal phase angles, setting incorrect drive frequencies, or failing to calibrate the rotating scanner. The manual is the Rosetta Stone for the device’s proprietary interface.