Riken Keiki GD-3EC, Technical Manual

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5. Usage Instructions 5-6 Performing zero calibration
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5-6 Performing zero calibration
This performs the zero calibration required to ensure accurate measurement of gas concentrations.
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.
1 Press the ▲ or ▼ key in user mode to select [1-1], 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 [1-1].
If zero calibration is unsuccessful
[FAIL] is displayed for three seconds before the display automatically
returns to [1-1].