Ntron SIL O2, User'S Operation Manual, Page: 18 / 56

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2.4.3 SPAN Calibration
This can be done periodically or as needed in accordance with the requirements of the calibration protocol.
Calibration can be performed by applying either clean ambient air or a 20.9% certified oxygen rate to the sensor.
Note:
•
The SIL 2 analyzer should only be calibrated at approximately 20.9% oxygen.
•
If an ambient air calibration is performed, it is recommended to confirm the oxygen level with a
certified portable oxygen analyzer prior to calibration.
•
If a zero setting is made first, then after the end of the zero operation mode, the Span mode is
automatically activated after a delay of 20 seconds.
•
If A Span only calibration is required, then just press the UP or DOWN buttons individually to
increase or decrease the displayed value of oxygen to read 20.9. Note: Ensure the Sensor is in
20.9% oxygen when you do this!
•
Calibration complete.
20.90
20.90