wtw Multi 9310, Operating Manual

Page: 37 / 102

Multi 9310 pH value
ba75937e03 12/2011
37
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:
25. Set the nominal buffer value for the measured temperature with
< S S S S >< T T T T > .
26. Accept the calibration value with <ENTER> .
The calibration display for the next buffer appears (voltage display).
27. If necessary, use <M> to finish the calibration.
The calibration record is displayed.
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.
Calibration Determined val-
ues Displayed calibration data
1-point Asy z Zero point = Asy
z Slope = Nernst slope
(-59.2 mV/pH at 25 °C)
2-point Asy
Slp. z Zero point = Asy
z Slope = Slp.
3-point to 5-
point Asy
Slp. z Zero point = Asy
z Slope = Slp.
The calibration line is calculated by
linear regression.
You can display the slope in the units, mV/pH or % (see section
9.1.1 S
ETTINGS FOR P
H
MEASUREMENTS
, page 62).