Sample Measurement; Performing A Ph Measurement; Performing A Mv / Redox Measurement; Temperature Measurement - Mettler Toledo Education EL20 Mode D'emploi

The measurement icon appears. The meter endpoints according to the preselected endpoint mode after
the signal has stabilized or after pressing Read. The relevant buffer value is displayed and stored; the
measurement icon disappears from the display.
The offset value and the slope are then shown on the display for 3 seconds. To reject the calibration,
press Exit before the meter returns automatically after 3 seconds to the measurement screen.
Note:
The use of a temperature sensor or an electrode with a built-in temperature sensor is recommended. If
you use the MTC mode, you should enter the correct temperature value and keep all buffer and sample
solutions at the set temperature.
To ensure the most accurate pH readings, you should perform a calibration once a day.
4.3

Sample measurement

4.3.1

Performing a pH measurement

Place the electrode in the sample and press Read to start the measurement: the measurement icon
appears on the display and the decimal point blinks. The display shows the pH value of the sample.
The automatic endpoint A is the default setting of the meter. When the signal has stabilized, the display
freezes automatically,
By pressing and holding Read, you can switch between the auto and manual endpoint modes. To
manually endpoint a measurement, press Read: the display freezes and
Stability criterion for pH and mV measurement – The signal of the sensor input may not change by
more than 0. mV in 6 seconds.
4.3.2

Performing a mV / Redox measurement

To switch to mV mode, press Mode.
To perform a mV measurement, follow the same procedure as for pH measurement.
(For Redox measurements, connect a Redox sensor first.)
4.4

Temperature measurement

For better accuracy, we recommend the use of either a built-in or a separate temperature probe. If a
temperature probe is used, ATC and the sample temperature are displayed.
Note:
The meter accepts an NTC 30 kΩ temperature sensor.
METTLER TOLEDO Education Line pH meter
Five_pH_edu.indb 9
appears and the measurement icon disappears.
Operating the pH meter
appears.
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