Automatic Buffer Recognition - Mettler Toledo SevenGo Duo pro SG68 Instrucciones De Manejo

Operating the pH/ORP/Ion/DO meter SG68
Note
Up to 5 calibrations can be saved for a dedicated sensor ID. The oldest calibration data is automatically
over writ ten with the current calibration data.

4.8.3 Automatic buffer recognition

The meter features automatic pH buffer recognition for the predefined buffer groups (see "Appendix"). The
buffers within a buffer group are automatically recognized by the meter and displayed during calibration.
This feature allows the calibration in any order within a predefined pH buffer group.
There is no automatic pH buffer recognition for customized buffer groups; in this case, the defined order
of the buffers needs to be followed.
4.8.4 Dissolved oxygen (DO) calibration
Preparing for calibration
Before running a calibration:
●
The sensor has to be connected to the meter for at least 6 hours (polarization time).
●
For the following digital ISM DO sensors (InPro6850i, InPro6950i), the meters need to be switched
on in order for the sensor to be polarized.
●
The "Auto override" function should be switched on.
●
The membrane must be examined for damage or contamination. If the membrane is dirty, clean care-
ful ly with a soft, moist cloth.
Performing a one-point calibration
The first point of a DO calibration is always done in vapor saturated air (100% O
a) Make sure that the sensor has been gently cleaned and dried. Water droplets on the membrane must
be removed, because they prevent the sensor from being correctly calibrated.
b) Press and hold MODE for 3 seconds to switch to single channel measurement screen when in dual
chan nel measurement.
c) Place the electrode in a bottle 1 cm above the water surface as shown in the graphic above and
press CAL.
d) Press End to accept the calibration and return to sample measurement.
e) Press Exit to reject the calibration.
Performing a two-point calibration
The second point of a DO calibration is done with a zero oxygen solution.
a) Follow steps a ­ c for the first calibration point as described above.
b) Rinse the sensor with deionized water.
c) Place the electrode in the zero oxygen solution and press CAL.
14
Cal 1 appears on the display.
The meter endpoints according to the preselected endpoint mode, automatically after the signal
has stabilized or after pressing READ. The standard value is shown on the display.
The calibration result is shown on the display.
Cal 2 appears on the display.
The meter endpoints according to the preselected endpoint mode, automatically after the signal
has stabilized or after pressing READ. The relevant buffer/standard value is shown on the dis-
play.
).
2
pH/ORP/Ion/DO meter SG68