Operation
pHotoFlex
®
Turb
50
ba75976e07
09/2021
ture dependence of the pH values is taken into account during calibration.
Calibration points
Calibration can be performed using one, two or three buffer solutions in any
order (single-point, two-point or three-point calibration). The meter deter-
mines the following values and calculates the calibration line as follows:
AutoRead
In calibration, the AutoRead function is automatically activated.
The current AutoRead measurement can be terminated at any time (accept-
ing the current value).
Buffer set
Name on the dis-
play
pH values at 25 °C
WTW Technical buffer
solutions
TEC
2.00
4.01
7.00
10.01
NIST/DIN
buffer solu-
tions
NIST/DIN
1.679
4.006
6.865
9.180
12.454
The buffers are selected in the menu
Configuration
/
pH & ORP
/
Calibr. type
Determined val-
ues
Displayed calibration data
1-point
Asy
Asymmetry =
Asy
Slope = Nernst slope
(-59.16 mV/pH at 25 °C)
2-point
Asy
Slp.
Asymmetry =
Asy
Slope =
Slp.
3-point
Asy
Slp.
Asymmetry =
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 4.6.4).
