Working Principle
The AMETEK 933 Oxygen Analyzer measures oxygen concentration using electrochemical or zirconia-based sensor technology (depending on configuration).
Oxygen partial pressure differences between the process gas and reference environment generate a signal proportional to oxygen concentration, which is converted to a process output.
Main Components
- Oxygen sensor (electrochemical / zirconia)
- Sample conditioning system
- Flow control and filtration
- Analyzer electronics and signal processing
- Analyzer controller / display
- Analog & digital outputs
Calibration Procedure
- Allow analyzer to complete warm-up
- Verify sample flow and pressure stability
- Apply Zero gas (nitrogen or oxygen-free gas)
- Apply Span gas (typically 5–20% O₂)
- Confirm stable readings before accepting calibration
- Return analyzer to process and verify normal operation
Frequent calibration drift often indicates
sensor aging or sample system leakage.
Major Troubleshooting Areas
- High Oxygen Reading – air leakage, process upset
- Low Oxygen Reading – sensor degradation, flow loss
- Calibration Failure – incorrect gas, leaks
- Unstable Signal – moisture ingress, electrical noise
- Analyzer Offline – power or electronics issue