pH/ION 7320
pH value
ba75935e04
12/2017
37
6.2.5 Calibration points
Calibration can be performed using one to five buffer solutions in any order
(single-point to five-point calibration). The meter determines the following
values and calculates the calibration line as follows:
26.
Set the nominal buffer value for the measured temperature with
<
><
>
.
27.
Accept the set calibration value with
<ENTER>
.
The calibration display for the next buffer appears (voltage display).
28.
Use
<M>
to finish calibration or
Continue calibrating using the next buffer with
<ENTER>
.
After the fifth buffer has been measured the calibration is automat-
ically finished. Then the calibration record is displayed.
The calibration line is determined by linear regression.
Values to be
determined
Displayed calibration data
1-point
Asy
Zero point =
Asy
Slope = Nernst slope
(-59.2 mV/pH at 25 °C)
2-point
Asy
Slp.
Zero point =
Asy
Slope =
Slp.
3-point to
5-point
Asy
Slp.
Zero point =
Asy
Slope =
Slp.
The calibration line is calculated by lin-
ear regression.
You can display the slope in the units, mV/pH or % (see section
9.1.1 S
pH
9.958
24.8
°C
ConCal
3
12.12.2012
12:12
Buffer
