Calibration; Buffer Groups; Selecting A Predefined Buffer Group; Setting Up A User-Defined Buffer Group - Mettler Toledo SevenGo SG2 Bedienungsanleitung

Calibration

4.2 Calibration

4.2.1 Buffer groups

The SevenGo™ SG2 pH meter allows you to perform 1-, 2-and 3-point calibrations. If you select your calib-
ration buffer group from one of the four predefined groups defined in the meter, the buffers are automatically
recognized and displayed during calibration (auto buffer recognition).
The four predefined buffer groups are:
B1 7.00
B2 7.00
B3 7.00
B4 6.86
Tables (B1...B4) for automatic temperature compensation are programmed in the meter (see also Appen-
dix).
You can also follow the buffer setting procedure described below to define your own buffer group, but in this
case auto buffer recognition does not work during calibration.

4.2.2 Selecting a predefined buffer group

Press and hold until the current buffer group blinks. Use
the desired buffer group blinks, press Read to confirm your selection.

4.2.3 Setting up a user-defined buffer group

Press and hold until the current buffer group blinks. Use
the values. Press Read to confirm the selection. The meter displays your current temperature setting and
the unit and frame blink (default temperature is 25 °C). Use
store the value and continue.
After setting the temperature value, the meter displays the current setting of the first calibration buffer (default
value 4.00). Use
After setting the first calibration buffer, press Cal to set the next calibration buffer.
The procedure is the same as for the first point. You can set up to three user-defined calibration buffers.
When you have completed your settings, press Read to exit.
Note
When using a user-defined buffer group in the calibration, the screen will display the buffer value you set.
Make sure that you use the correct buffer.
For user-defined buffers, there is no buffer table programmed in the meter. Therefore you should always keep
the buffer temperature at the set value. When using a temperature probe, if the temperature measured differs
by more than 1 °C from the set value, Err 5 appears.
10
51710340 Buch.indb 10
4.00 10.01 1.68
4.01 9.21 2.00
4.00 9.00 2.00
4.01 9.18 1.68
or to change the buffer value. Press Read to store the value and continue.
(at 25 °C)
11.00 (at 25 °C)
12.00 (at 20 °C)
(at 25 °C)
or to select another buffer group. When
or until B5 appears to start setting
or to change the value. Press Read to
METTLER TOLEDO SevenGo™ pH
28.2.2006 15:40:23 Uhr