Operation
pH 3310
30
ba75802d06
05/2017
4.4.5
pH calibration
Why calibrate?
pH electrodes age. This changes the zero point (asymmetry) and slope
of the pH electrode. As a result, an inexact measured value is dis-
played. Calibration determines and stores the current values of the
zero point and slope of the electrode.
Thus, you should calibrate at regular intervals.
When do you have to
calibrate?
After connecting another combination electrode
When the calibration interval has expired
Buffer sets for
calibration
You can use the buffer sets quoted in the table for an automatic calibra-
tion. The pH values are valid for the specified temperature values. The
temperature dependence of the pH values is taken into consideration
during calibration.
Stability control
On
/
Off
Switches on or off the
automatic stability control
during measurement (see
section 4.3.3)
Reset
-
Resets all sensor settings
to the delivery condition
(see section 4.8.1).
Menu item
Possible
setting
Explanation
No.
Buffer set *
pH values
at
1
ConCal
Any
Any
2
NIST/DIN
DIN buffers according to DIN
19266 and NIST Traceable
Buffers
1.679
4.006
6.865
9.180
12.454
25 °C
3
TEC
WTW Technical buffers
2.000
4.010
7.000
10.011
25 °C
4
Merck 1*
4.000
7.000
9.000
20°C
