wtw pH 7310, Operating Manual

Page: 31 / 72

pH 7310 pH value
ba75929e02 10/2011
31
5.2.5 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.
Determined
values
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
7.1.1 C
HANGING THE SETTINGS FOR P
H
MEASUREMENTS
, page 38).
pH
9.958
24.8 °C
ConCal
3
01.07.2011
08:00
Buffer

