Performing A 1-Point Calibration; Performing A 2-Point Calibration; Performing A 3-Point Calibration - Mettler Toledo SevenGo SG2 Bedienungsanleitung

Calibration

4.2.4 Performing a 1-point calibration

Place the electrode in a calibration buffer and press Cal. The SG2 endpoints according to the preselected
endpoint mode after the signal has stabilized or after pressing Read the meter displays and freezes the
relevant buffer value. The offset value and the slope are then shown on the display.
To accept the calibration and return to sample measurement, press Read. To reject the calibration, press
Exit.
Note
With the 1-point calibration only the offset is adjusted. If the sensor was previously calibrated with multi-
point calibration the previously stored slope will remain. Otherwise the theoretical slope (59.16 mV / pH)
will be used.

4.2.5 Performing a 2-point calibration

- Step 1 Perform the first point calibration as described above in "Performing a 1-point calibration".
- Step 2 Rinse the electrode with deionized water.
- Step 3 Place the electrode in the next calibration buffer and press Cal.
The SG2 endpoints according to the preselected endpoint mode after the signal has stabilized or after pressing
Read. The meter displays and freezes the relevant buffer value, updates the electrode offset and shows the
new slope calculated from the two calibration points.
To accept the calibration and return to sample measurement, press Read. To reject the calibration, press
Exit.

4.2.6 Performing a 3-point calibration

Perform the same steps as described above in "Performing a 2-point calibration", and then repeat steps 2
and 3 for the third calibration point.
Note
The use of a temperature sensor or 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 regularly.
METTLER TOLEDO SevenGo™ pH 11
51710340 Buch.indb 11 28.2.2006 15:40:23 Uhr