horiba B-711, Инструкция по эксплуатации

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9
5 Calibration
5.1 About calibration
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Calibration points
The available calibration points depend on the meter models.
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One-point calibration at pH 7: B-711, B-712, B-713
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One-point calibration at pH 4: B-712, B-713
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Two-point calibration: B-712, B-713
“One-point calibration at pH 7” is set by default.
Refer to the instructions on page 19 for switching the calibration points (for
B-712 and B-713 only).
The calibration point setting and calibration result are saved after the meter
is turned OFF.
Tip
For B-712 and B-713, two-point calibration is recommended especially
if sample pH is outside 1 pH from the pH of the standard solution.
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Precautions for calibration
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If remains blinking and Err (error display)
appears, the calibration is failed.
Check that the standard solution pH is correct,
and perform calibration again after cleaning the
sensor well.
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If the calibration is failed using correct standard solution(s), the sensor
may be deteriorated. Replace the sensor with new one (part No.:
3200459834).
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In two-point calibration, confirm that the calibration operations are
completed respectively for pH 7 and pH 4.
The calibration operation for pH 4 can not start until the calibration for
pH 7 is completed, and the whole calibration sequence is not com-
pleted until the calibration for pH 4.