Xylem ProLab 4000 - Manual (Page 76)

pH ProLab 4000
76 ba75646e03 12/2012
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protected by law (see page 215).
Calibration points Calibration can be performed using one to five buffer solutions in any
order (single-point to five-point calibration). The measuring instrument
determines the following values and calculates the calibration line as
follows:
19 Reagecon TEC * 2,000
4,010
7,000
10,000
25 °C
20 Reagecon 20 * 2,000
4,000
7,000
10,000
13,000
20°C
21 Reagecon 25 * 2,000
4,000
7,000
10,000
13,000
25 °C
22 Riedel-de Haen * 2,000
4,000
7,000
10,000
20°C
No. Buffer set * pH values at
Note
The buffers are selected in the Calibration sensor menu (see
page 73).
Displayed calibration data
1-point  Zero point
 Slope = Nernst slope (-59.16 mV/pH at 25 °C)
2-point  Zero point
 Slope
3-point to
5-point  Zero point
 Slope
The calibration line is calculated by linear regression.