Riken Keiki GD-3EC, Technical Manual

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7. Maintenance 7-4 Performing calibration
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1 Press the ▲ or ▼ key in maintenance mode several times
to select [2-1], then press the SET key.
2 Introduce the zero calibration gas, then press the SET key.
Zero calibration starts.
3 Check the zero calibration result.
If zero calibration is successful
[PASS] is displayed for three seconds before the display
automatically returns to [2-1].
If zero calibration is unsuccessful
[FAIL] is displayed and the display returns to [2-1] when the
SET key is pressed.
NOTE
 If zero calibration is unsuccessful because the zero point (N2 in the case of oxygen) fluctuates
significantly around zero, [FAIL] is displayed. If this occurs, zero calibration was not performed.
7-4-3 Performing span adjustment
Perform the span adjustment required to ensure accurate measurement of gas concentrations.
Prepare the span adjustment gas, then connect to the product before starting span adjustment.
For information on span adjustment preparation, refer to ‘7-4-1 Calibration preparation’.
NOTE

Dedicated equipment is required for span adjustment. We recommend contacting Riken Keiki to request
the required equipment.