Riken Keiki GD-3EC, Technical Manual

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5. Usage Instructions 5-6 Performing zero calibration
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NOTE
 If zero calibration is unsuccessful because the zero point ([20.9] (vol%) in the case of oxygen) fluctuates
significantly around zero, [FAIL] is displayed before the display returns to [1-1]. If this occurs, zero
calibration was not performed.
 [1-1] corresponds to span adjustment for the oxygen deficiency alarm specifications. Introduce clean air
to adjust to [20.9] (vol%). For information on span adjustment, refer to ‘7-4-3 Performing span
adjustment’.