SPAN CALIBRATION
GasCheck: Span calibration is undertaken to ensure accurate gas concentration
reading (i.e. ensure that the display reading in ppm is accurate and true). For
example, an OSHA safety officer using a CO detector used in the field would want
to calibrate to a concentration of 50ppm, since ambient CO is usually in the
lower range. The span calibration gas concentration chosen is best chosen to
represent the concentration that the sensor typically is exposed to, as to ensure
maximum accuracy for daily application usage. We recommend calibration to be
undertaken every 6 months. For analytical and highly specific applications,
calibration can be undertaken more often to ensure the highest accuracy. If left
beyond 6 months, the accuracy of the analyzer will be compromised.
To undertake span calibration from the MENU SCREEN select GasCheck. Select
passcode 1111. Select Gas to Span Calibrate. Expose to CAL gas for 1 min. For
O2, simply expose the analyzer to fresh air, which will have 20.9% of O2. When
using gas bottles, maintain a flow of about 0.5L/min when using gas bottles.
Enter and edit the gas concentration so the detector knows the concentration of
the calibration gas. After exposure, press SAVE. When complete, “SAVE
SUCCESS” is displayed. Use an appropriate multigas mixture is OK or single gas
mixture is also OK to calibrate a single sensor. Again, for oxygen, don’t forget to
simply use fresh ambient air 20.9%.
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