4.3.2 How often to calibrate
• We recommend to calibrate the conductivity meter once per month under normal conditions.
• If the requirement for accuracy is high or the temperature of the test sample has a big difference to
the reference temperature (25 ˚C), we recommend to do the calibration once a week.
• Users can tell if the meter needs a calibration by testing the standard calibration solutions. If the
measurements you get have a big difference to the standard value of the calibration solutions, then a
calibration is necessary.
• For new electrodes or the meter that has been restored to factory default setting, we recommend to
conduct 3-4 points calibration. For general uses, users can choose the calibration solutions that are
close to the test samples to conduct 1 or 2 points calibration.
4.4 Conductivity Calibration (take 1413 μS as an
example)
4.4.1. Rinse the electrode in distilled or pure water, allow it to dry, wash with
a little of standard solution and submerge it in standard solution. Stir the
solution briefly and allow it to stay in the solution until a stable reading is
reached.
4.4.2. Press key to enter the calibration mode. The “CAL” icon will
flash at the top right, and the scanning and locking process of calibration
solution will appear at the bottom right.
4.4.3. When the meter locks 1413 μS, stable icon will display on LCD.
Press key to complete calibration. “End” icon will show up and the
meter will return to measuring mode and will show up on the bottom
left (see Figure-7).
Note: pressing before the reading being stable ( shows up and stays), the
Err4 self-diagnosis icon will appear (see section 6.5.2).
4.4.4. For multi-point calibration, please repeat clause 4.3.1-4.3.2 until all the calibration is done. The
meter can repeat calibration in the same calibration solution until the stable value is reached.
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