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Proceed as follows:
1. Remove the protective cap from electrode.
2. Clean the electrode with distilled water, and dry it well.
3. Press the “power” button to turn on the device.
4. Immerse the electrode into the test solution, and stir lightly.
5. Press Mode to select EC or pH Mode.
6. Hold down the mode button in EC mode for approx. 5 seconds
to switch to TDS mode and again for 5 seconds each time to
switch through the different modes (ms, µs, ppt, ppm).
7. Use the TEMP button to switch the temperature range
between ° C and ° F.
8. Take a few seconds to get the final stable reading.
9. Wash electrode after use. Press “ON/OFF” to turn off.
4.2 Calibration of the device
4.2.1 PH calibration
For calibration, standard buffer solutions pH6.86, pH4.00 and pH
9.18 are required, which can be obtained from specialist dealers. The
measuring device can identify the standard buffer solution of pH 4.00
and pH 6.86 itself and automatically calibrates this value.
1. Pour the standard buffer solution pH 6.86 and pH 4.00 (at
approx. 25 ° C) separately into three different clean beakers.
2. Press "ON" to switch on the device.
3. Immerse the electrode in a standard buffer solution pH 6.86 and
then stir gently until the value is stable. Press the "Temp / Cal"
button for 5 seconds. When the display value "686" corresponds
to the standard buffer solution, the calibration is finished.
4. Clean the electrode.
5. Immerse the electrode in a standard buffer solution pH 4.00 and
when the measuring value has stabilized, press "Temp / Cal" for
5 seconds.
6. When the display shows "401", the meter changes to the
automatic pH4.01 calibration mode. When the display value
corresponds to the standard buffer solution, calibration is
complete.