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Operation
Preparatory activities
Setting the calibration
interval
47
Perform the following preparatory activities when you want to calibrate:
1
Connect the IDS pH sensor to the meter.
The pH measuring window is displayed.
2
Keep the buffer solutions ready.
4.7.5 Calibration interval
The calibration evaluation is displayed as a sensor symbol.
After the QSC function has been enabled the sensor symbol is
replaced by the QSC color scale (see section 4.7.10).
After the specified calibration interval has expired, the sensor symbol
or the QSC color scale flashes. It is still possible to measure.
Note
To ensure the high measuring accuracy of the measuring system, cal-
ibrate after the calibration interval has expired.
The calibration interval is set to 7 days (d7) in the factory.
You can change the interval (1 ... 999 days):
1
Open the menu for measurement settings with <MENU/
ENTER>.
2
In the Calibration / Calibration interval menu, set the calibration
interval with <><>.
3
Confirm the setting with <MENU/ENTER>.
4
Quit the menu with <M>.
4.7.6 Carrying out an automatic calibration (AutoCal)
Make sure that in the sensor menu, Buffer menu, the buffer set is cor-
rectly selected (see section 4.7.3).
Use any one to five buffer solutions of the selected buffer set in ascend-
ing or descending order.
Below, calibration with Technical buffers (TEC) is described. When
other buffer sets are used, other nominal buffer values are displayed.
Apart from that, the procedure is identical.
Multi 3420
ba75864y18
01/2015
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