horiba OM-71G, Instruction Manual

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Dissolved oxygen measurement
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6. While the DO electrode is immersed in the standard solution, press the key.
Stabilization judgment starts and the HOLD icon blinks. When the value is stabilized,
the HOLD icon changes from the blinking state to the lit state and calibration to the
standard solution value is performed. Also, "ZERO" is displayed, indicating completion
of zero calibration.
7. Perform the 2nd point calibration. As with the
step 1., wash the DO electrode and immerse in
the span standard solution. As with the step 5.,
immerse at least 6 cm from the tip of the DO
electrode.
To maintain oxygen saturated status, continue
bubbling until calibration is finished.
Note
When using an electrode "9551-20D" or "9551-100D", immerse at least 9 cm from the tip.
8. While the DO electrode is immersed in the standard solution, press the key.
Stabilization judgment starts and the HOLD icon blinks. When the value is stabilized,
the HOLD icon changes from the blinking state to the lit state and calibration to the
standard solution value is performed. Also, "SPAN" is displayed, indicating completion
of span calibration.
Calibration using the standard solution is complete.
Stabilized
key
Stabilized
key