wtw pHotoFlex pH Operating Manual page 55

®
pHotoFlex pH
Calibration points
AutoRead
Calibration record
Displaying and down-
loading calibration data
to interface
ba75975e05 10/2017
Calibration can be performed using one, two or three buffer solutions in
any order (single-point-, two-point or three-point calibration). The meter
determines the following values and calculates the calibration line as
follows:
Determined val-
ues
1-point Asy
2-point Asy
Slp.
3-point Asy
Slp.
You can display the slope in the unit, mV/pH or % (see section 4.6.4).
The calibration procedure automatically activates the AutoRead func-
tion.
The current AutoRead measurement can be terminated at any time
(accepting the current value).
When finishing a calibration, the new calibration values are displayed
as an informative message (
whether you want to take over these values of the new calibration or
whether you want to continue measuring with the old calibration data.
After accepting the new calibration values the calibration record is dis-
played.
You can view the data of the last calibration on the display. Subse-
quently, you can download the displayed calibration data to the inter-
face, e. g. to a printer or PC, with the <PRT> key.
The calibration record of the last calibration can be found under the
Configuration / pH & ORP / Calibration / Calibration record menu item.
Displayed calibration data
 Asymmetry = Asy
 Slope = Nernst slope
(-59.16 mV/pH at 25 °C)
 Asymmetry = Asy
 Slope = Slp.
 Asymmetry = Asy
 Slope = Slp.
The calibration line is calculated
by linear regression.
symbol) first. Then you can decide
i
Operation
55