Mettler Toledo SevenGo Duo pro SG68 Mode D'emploi page 27

3. Ion standards
Concentrations for up to 5 standards with one standard temperature can be defined (see "pH/ion mea­
sure ment settings"). Five concentration units are available:
●
mmol/L
●
mol/L
●
ppm
●
mg/L
●
%
2. Calibration mode
Two calibration modes are offered:
●
Segmented: the calibration curve is made up of linear segments joining the individual calibration
points. If high accuracy is required, the segment method is recommended.
●
Linear: the calibration curve is determined using linear regression. This method is recommended for
sam ples with widely varying values.
Note
These settings applies to both pH and Ion calibration.
3. Calibration reminder
When the calibration reminder is "On", the user is reminded to perform a new calibration after a certain
user­defined interval (maximum 9999 h) has elapsed.
Press READ to save the interval and another screen appears to select calibration expiration date.
Four different time spans can be programmed. In all four cases, a warning message appears that the
elec trode should be calibrated.
●
Immediately
The meter is immediately blocked for measurement when the predefined interval has elapsed.
●
Reminder + 1h
The meter is blocked for measurement 1 hour after the predefined interval has elapsed.
●
Reminder + 2h
The meter is blocked for measurement 2 hours after the predefined interval has elapsed.
●
Continue Reading
The user can continue measuring when the predefined interval has elapsed.
6.5 pH/ion measurement settings
1. Measurement Resolution
The resolution for pH and mV needs to be set for the display. Up to 3 decimal places can be chosen
depend ing on the unit of measurement (see table below).
On display
X.XXX
X.XX
X.X
X
In the ion mode, the measurement resolution depends on the concentration and the unit of the measured
ion.
2. Stability Criterion
The Stability icon appears according to the following stability criteria:
pH/ORP/Ion/DO meter SG68
Description
three decimal places
two decimal places
one decimal place
no decimal places
Menus and settings
Option
pH
pH
pH, mV
mV
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