5
pH Calibration
PCE-PH 28L pocket pH meter allows up to 3 points calibration. We recommend that you perform at least 2 points calibration for high accuracy
measurement. The meter will automatically recognize and calibrate to following standard buffer values.
USA Standard Buffers
pH4.01, 7.00, 10.01
NIST Standard Buffers
pH4.01, 6.86, 9.18
Single point calibration should only be carried out with pH7.00 or pH6.86, otherwise calibration will not be accepted.
The meter must be calibrated prior to first use or new electrode replaced. To ensure accuracy, regular calibration is recommended. DO NOT
reuse the pH buffer solution after calibration, contaminants in solution will affect the calibration and eventually the accuracy of the
measurement.
Single point calibration
1.1
Make sure that you have selected 1 point calibration in the setup menu.
1.2
Rinse the electrode with distilled water.
Press the
Cal
key,
the meter shows
pH7.00/CAL1 (or pH6.86/CAL1).
1.3
Place the electrode into the pH7.00 (or pH6.86) buffer solution, the end of the
electrode must be completely immersed into the calibration solution. Stir the
electrode gently to create a homogeneous solution.
1.4
Press the
Enter
key, the meter begins the calibration.
1.5
Wait for the reading to stabilize, the display automatically shows END. Single
point calibration is completed.
