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For better accuracy, frequent calibration of the pH sensor
with the meter is recommended. In addition, the meter
must be recalibrated whenever:
a) The pH electrode is replaced.
b) After testing aggressive chemicals.
c) Where high accuracy is required.
d) At least once a month.
e) After cleaning the sensor.
†
The probe tip should be rinsed with purified water (reverse osmosis,
distilled, or deionized) before and after placing in any solution (buffer,
storage, or sample).
pH calibration
Enter calibration mode while in
pH measurement mode. Place the
sensor into the first calibration
buffer. If performing a two‑point
calibration, use pH 7.01 (pH 6.86
for NIST) buffer first. The meter will
enter the calibration mode, displaying "pH 7.01 USE"
and
tag blinking (or "pH 6.86 USE" for NIST).
Follow directions for single and two‑point calibration below:
Single-point calibration
1. Place the probe in any buffer from the selected buffer set.
The meter will automatically recognize the buffer value.
2. If the buffer is not recognized or the calibration offset is out
of the accepted range "---- WRONG" is displayed.
3. If the buffer is recognized "REC" is displayed then
"WAIT" until the calibration is accepted.
If using pH 7.01 (or pH 6.86 for NIST), after acceptance
of the buffer press any key to exit. The "SAVE" message is
displayed and the meter returns to pH measurement mode.
If using pH 3.00 or 10.01 (or pH 9.18 for NIST) buffer
the "SAVE" message is displayed and meter returns to pH
measurement mode.
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