Sample Measurement; Performing A Ph Measurement; Performing A Mv / Redox Measurement; Temperature Measurement - Mettler Toledo FiveEasyPlus FEP20 Bedienungsanleitung

2 Step 2: Rinse the electrode with deionized water.
3 Step 3: Place the electrode in the next calibration buffer and press Cal.
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.
4 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 recommend­
ed. 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.
5.2 Sample Measurement
5.2.1 Performing a pH Measurement
To switch from mV mode to pH, press Mode.
1 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.
2 The automatic endpoint A is the default setting of the meter. When the signal has stabilized, the
display freezes automatically,
- or -
To manually endpoint a measurement, press Read. The display freezes and
Note
● By pressing and holding Read, you can switch between the auto and manual endpoint modes.
● Stability criterion for pH and mV measurement – The signal of the sensor input may not change by
more than 0.15 mV in 6 seconds.
5.2.2 Performing a mV / Redox Measurement
To switch from pH mode to mV, press Mode.
For Redox measurements, connect a Redox sensor first.
– To perform a mV measurement, follow the same procedure as for pH measurement, see "Perform­
ing a pH Measurement (page 10)".
5.3 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, and the sample temperature are displayed.
Note
The meter accepts an NTC 30 kΩ temperature sensor.
10 Operating the instrument
appears and the measurement icon disappears.
appears.