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Thermo Fisher Scientific EcoScan pH/Ion 5 & 6 User Manual

Page 17

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Instruction Manual

pH 5/6 & Ion 5/6

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3.4 Millivolt (mV) Calibration (for pH 6 only)

mV calibration is performed for ORP or Redox measurements, where you can adjust its
mV value as a base value for measurements.

1. Press

MODE key to enter mV mode, the LCD displays “mV”.

2. Dip the ORP electrode into a known standard solution, e.g. Quinhydrone 255 and

swirl it until the reading stabilizes.

3. Press

CAL key to enter mV calibration. The LCD shows “CA” momentarily followed

by displayed reading flashes.

4. To abort calibration press CAL key. Meter reverts to measurement mode.

5. To proceed calibration use INC key to adjust the reading to your desired value. The

maximum adjustment you can make is ± 50 mV. Pressing INC key continuously
allows you to scroll to the maximum allowable value and then loops back to the
minimum allowable value.


6. Press

ENTER key to confirm calibration. The display shows “CO” momentarily and

meter reverts to measurement mode showing the current set value.