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8. pH
8.1. PREPARATION
MW105: Up to 3-point calibration using 7 standard buffers.
MW106: Up to 5-point calibration using 7 standard buffers and
2 custom buffers (CB1 and CB2).
1. Prepare two clean beakers. One beaker is for rinsing and one
for calibration.
2. Pour small quantities of the selected buffer solution into each
beaker.
3. Remove the protective cap and rinse the probe with the buffer
solution for the first calibration point.
8.2. CALIBRATION
General Guidelines
For better accuracy, frequent calibrations are recommended.
The probe should be recalibrated at least once a week, or:
Whenever is replaced
After testing aggressive samples
When high accuracy is required
When the calibration time out has expired
Procedure
1. Place the pH probe tip approximately 4 cm (1 ½")
into the buffer solution and stir gently. For a 2-point
calibration, use the pH 7.01 (pH 6.86 for NIST) buffer first.
Press CAL/EDIT to enter Calibration mode. Buffer value and
"WAIT" message are displayed blinking. If required, use the
keys to select a different buffer value.
2. When the reading is stable and close to the selected buffer,
the ACCEPT tag is displayed blinking. Press GLP/ACCEPT to
confirm calibration.
pH 23
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