the LCD (as showed in Figure-11). At the time, the meter can still be
operated. It is just reminding you to do calibration in order to ensure the
accuracy. After calibration, the Er6 icon will disappear; To make it
disappear, users can also choose “No” in P2.2 in parameter setting.
7.3.8 Check calibration date
In this mode, users can see the date and time of last calibration to help determine if there is a need
to re-calibrate. For details, please see parameter setting P2.3 (Section 7.4)
7.4 Conductivity Calibration (take 1413 μS/cm
2
as an example)
7.4.1 Rinse the electrode in distilled water, allow it to dry, wash with a little
of standard solution and submerge it in 1413μS/cm standard solution. Stir
briefly and allow it to stay in the solution until a stable reading is reached.
7.4.2 Press key to enter the calibration mode. The meter’s display
will show blinking―CAL at the top right, and scanning and locking
process of calibration solution at the bottom right. Er2 icon will appear if
press before value is stable. See table-6
7.4.3 When the meter locks 1413 μS, stable icon will display on LCD.
Press key to complete calibration. End will appear and the meter
will return to measuring mode and is displayed on bottom left of the
LCD screen. See figure-12.
7.4.4 Press key before confirmation to exit calibration mode
(calibration will not be completed).
7.4.5 For multi-point calibrations, please repeat the steps in 6.4.1 to 6.4.3
until all calibrations are finished. The meter can be calibrated in the same
calibration solution repeatedly until the reading is stable and repeatable.
7.5 TDS, Salinity, Resistivity & Conductivity
7.5.1 TDS and conductivity is linear related. The conversion factor is 0.40-1.00. Adjust the factor
from parameter P2.6. The factory default setting is 0.71 and please refer to section 7.4. Salinity and
resistivity are all proportional to conductivity. The calculating formula is preset in the meter. So the
meter only needs to be calibrated in Conductivity mode, then after calibration of conductivity, the
meter can switch from conductivity to TDS, salinity, or resistivity.
7.5.2 Adjust TDS conversion factor in parameter setting P2.7 according to the data collected during
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