Riken Keiki GD-3EC, Technical Manual

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7. Maintenance 7-4 Performing calibration
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7-4-2 Performing zero calibration
Gas concentrations cannot be accurately measured unless zero calibration is performed correctly.
Be sure to carry out zero calibration to ensure accurate measurement.
Prepare the zero calibration gas, then connect to the product before starting zero calibration.
For information on zero calibration preparation, refer to ‘7-4-1 Calibration preparation’.
WARNING

Before performing zero calibration for the surrounding atmosphere, confirm that the surrounding
atmosphere contains clean air. Performing zero calibration in the presence of miscellaneous gases will
prevent correct calibration and create safety hazards in the event of an actual gas leak.
CAUTION

Perform zero calibration after supplying the zero calibration gas and waiting for the reading to stabilize.