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Operation
Why calibrate?
When do you have to
calibrate?
Buffer sets for
calibration
40
4.6.4 pH calibration
IDS pH sensors age. This changes the zero point (asymmetry) and
slope of the IDS pH sensor. As a result, an inexact measured value is
displayed. Calibration determines the current values of the zero point
and slope of the IDS pH sensor and stores them in the measuring
instrument.
Thus, you should calibrate at regular intervals.
When the calibration interval has expired
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 the calibration.
No.
Buffer set *
1
ConCal
2
NIST/DIN
DIN buffers according to DIN
19266 and NIST Traceable Buffers
3
TEC
WTW Technical buffers
4
Merck 1*
5
Merck 2 *
6
Merck 3 *
7
Merck 4 *
Multi 3410
pH val-
at
ues
Any
Any
1.679
25 °C
4.006
6.865
9.180
12.454
2.000
25 °C
4.010
7.000
10.011
4.000
20°C
7.000
9.000
1.000
20°C
6.000
8.000
13.000
4.660
20°C
6.880
9.220
2.000
20°C
4.000
7.000
10.000
ba75863e02
12/2009
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