Calibration - Elcometer 148 Operating Instructions Manual

3 CALIBRATION

Calibration should be performed as frequently as possible to ensure accurate measurement, depending on
the frequency of tests performed. Additional calibration solution should be purchased for future needs (See
"Spares & Accessories" on page 10).
1. Cut open the shorter end of the pH7 calibration sachet.
2. Dip the sensor fully into the sachet, stir a little to remove the bubbles.
3. Press and hold-down the ON/OFF/CAL button until CAL is displayed, followed by a flashing 7.00.
4. When SA is displayed followed by End, calibration is complete and the unit resumes measurement.
5. Rinse the sensor with distilled water and blot dry before proceeding.
6. To perform a second point calibration, choose either pH4 or pH9 solution for calibration. For example,
if you are measuring between pH7 and pH4, then pH4 should be selected.
7. Cut open the short end of the calibration sachet.
8. Dip the sensor fully into the sachet and again stir gently to remove any bubbles.
9. Press and hold-down the CAL button until CAL is displayed, which should be followed by a flashing
4.00 (or 9.00).
10. When Elcometer 148 pH Tester displays %, followed by SA, then End, calibration is completed and the
unit resumes measurement.
11. Rinse the sensor with distilled water and blot dry before proceeding.
12. To perform a third point calibration, repeat 6 to 11 with the other solution.
13. ERROR CODE: If SA does not appear after calibration, calibration has failed. Check if electrode is
damaged by swopping for a new one.
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