Okolab LEO, Руководство пользователя

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to a gas of known concentration used as a comparative standard. The calibration procedure detects and
deletes the reading error.
• Factory : to cancel the last CO2/O2 User Calibration and restore the factory values. See paragraph
13.3.
•
CO2 Zero Reset : to correct the zero of the CO2 sensor. See paragraph 13.4.
•
Offset: to set CO2 and/or O2 offset using an external gas meter. See paragraph 13.5.
13.1 View Current
LEO is equipped with a factory calibrated CO2-O2-MODULE using certified gas cylinders. The factory
calibration certificate is included in electronic format and can be seen in the CO2/O2 Calibration page. Press the
View Current icon (see Figure 77 a) to view the factory calibration or CO2/O2 User Calibration data. If no
CO2/O2 User Calibration has been made, there are only the CO2 and/or O2 Factory Calibration subpages, as in the
example shown in Figure 77 b and c.
a b
c
Figure 77. CO2/O2 View Calibration (a – b – c).
The recommended CO2-O2-MODULE calibration interval is six months. However, Okolab suggests to
verify LEO’s reading each month or before each important measurement by employing a certified span gas . To
achieve the best accuracy, perform the gas measurement immediately after the CO2/O2 User Calibration.
13.2 Span Calibration
To improve LEO reading accuracy, it is possible to perform CO2/O2 User Calibration using span gases.
If you want to achieve the best accuracy in the sensors’ measurement range 0 – 10%, Okolab suggests to
use a certified span gas cylinder with composition similar to the gas used during your working standard conditions.
In this case, after the CO2/O2 User Calibration you can achieve an accuracy of ±0.1%.
If you want to achieve the best accuracy in the sensors’ full measurement range, Okolab suggests to use up
to two span gases:
•
Certified span gas cylinder with composition similar to the gas used during the standard working
conditions