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3
Calibration
3.1 pH Calibration
The Micro 600 pH meter is capable of up to three-point calibration with standard
pH buffer values at pH 4.01, 7.00 and 10.01 to ensure accuracy across the entire
range of the meter. It also allows offset adjustment in mV and Temperature
modes. All new calibration values will automatically override existing data.
It is recommended that you perform at least two-point calibration at room
temperature using standard buffers. For a one-point calibration, calibration
should be performed with a pH buffer value closest to expected sample value
being measured. Otherwise calibrating at pH 7.00 is advisable.
Ensure that you use fresh pH buffer solutions as they may be contaminated
and affect the calibration and accuracy of measurements.
Before use, remove the plastic protective cap of pH electrode and condition
the glass bulb by soaking it in tap water for 1 - 2 hours. This hydrates the
glass bulb if electrode is too dry or has been used for a long period of time.
Always rinse the probes with tap water or rinse solution before and after
each calibration/sample measurement to avoid cross-contamination.
For details please refer to section on Electrode Care and Maintenance.
Note: Always use fresh pH buffer solutions for calibration. Do not
reuse buffer solutions as they change with prolonged exposure to
air (especially pH 10 buffer) resulting in decreased measurement
accuracy. Promptly seal containers and store solutions in a dark,
dry, cool environment.
pH Calibration Procedure
1 Turn on the meter and select pH mode by pressing MODE if necessary.
2 Press CAL to begin pH calibration mode. "CA" (calibrate) will display
briefly. Notice that the pH reading and "pH" annunciator will both blink.
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