Zero gas: In calibration mode, the prepared nitrogen or other oxygen-free gas is introduced into the oxygen detector through appropriate pipelines.

Adjust the flow rate: ensure that the gas flow rate meets the requirements of the instructions of the oxygen detector, so as to avoid affecting the calibration result due to too large or too small flow rate.

Set the zero point: Wait for a period of time. After the reading of the oxygen detector is stable, use the tool or button attached to the instrument to set the oxygen concentration displayed by the instrument to 0%. Some instruments may require the user to manually enter a value, while others may automatically recognize and set the zero point.

Verify the calibration result: After setting the zero point, recheck the display of the oxygen detector to ensure it shows 0%.If the displayed value is not 0%, repeat the above steps until the exact zero point is reached.

3. Span Correction

Standard gas in range: after the oxygen detector is turned on for 30 minutes, the standard oxygen of about 20%, 50% and 80% of the full scale is introduced in sequence.

Wait for the reading to be stable: After waiting for the oxygen detector to display stable value, compare the display value with the standard gas. Whether the nominal value is within the error range.

adjust the error: if it is out of the error range, you need to select user calibration according to the menu key of the oxygen detector, enter the calibration interface, and select range calibration. Modify the displayed value by pressing the key to match the "Standard Gas Nominal Value", and press and hold the key to quickly modify it. After the modification, press the confirmation key to save the value and automatically enter the range calibration.

4. validation and logging