FAQ: How to Calibrate Your Oxygen Analyzer
We recommend checking your oxygen analyzer for accuracy at least once a year. If your analyzer is displaying incorrect readings, follow the steps below to verify and recalibrate it.
How to Verify Analyzer Accuracy:
Connect the analyzer’s sample line to a canister of known test gas. The reading on the controller display should match the concentration listed on the canister.
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Calibration Instructions
- Turn off the generator.
- Close the ball valve connected to the sample line at the nitrogen storage tank.
- Disconnect the sample line from the sample port outside the electrical cabinet.
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Access the calibration menu on the PLC (display):
- Press Menu
- Enter password: 6557 and press the Return key (bottom-right button)
- Select Sensor Setup/Calibration
- Select O2 PPM/% Calibration
For % (Percentage) O₂ Units:
- Enter the value from your test gas canister (typically 1%) into the “0–2% O₂ Calibration Gas” field.
- Enter 20.9% in the “20–22% O₂ Calibration Gas” field.
For PPM Units:
- Enter the lower PPM (higher purity) value from your gas canister (typically 10 PPM) into “O₂ PPM Low Calibration.”
- Enter the higher PPM (lower purity) value (typically 700 PPM) into “800–1000 PPM Cal Gas.”
Calibration Process:
- Connect the provided regulator to the low side calibration gas (e.g., 10 PPM).
- Connect the provided tubing to the sample line port on the electrical cabinet.
- Open the regulator valve and allow gas to flow to the analyzer for at least 5 minutes.
- On the calibration screen, locate the “Current Raw” value displayed at the bottom.
- Enter this value into the first (low side) calibration field.
- Close the valve on the regulator and switch to the high side calibration gas (e.g., 700 PPM).
- Open the valve and let gas flow for another 5 minutes.
- Again, note the “Current Raw” value.
- Enter this second value into the second (high side) calibration field.
- Close the valve on the regulator.
- Disconnect the calibration tubing.
- Reconnect your regular sample line to the cabinet port.
- Open the valve at the nitrogen storage tank to resume normal operation.
That’s it! Your analyzer should now be properly calibrated.
If you run into any issues or need help, please don’t hesitate to call us at (910) 415-1880.