wtw pHotoFlex, Operating Manual

Page: 59 / 111

pHotoFlex / pHotoFlex Turb Operation
59 ba75491e05 04/2009
Note
For single-point calibration, the instrument uses the Nernst slope
(-59.16 mV/pH at 25 °C) and determines the asymmetry of the elec-
trode.
4 If the Set temperature menu item appears, measure and enter
the temperature of the buffer manually (measurement without
temperature sensor).
5 Using <
▲
> <
▼
>, select Continue and press <START/EN-
TER>. The buffer is measured.
The measured value is checked for stability (AutoRead).
6 Wait for the end of the AutoRead measurement or accept the
calibration value with <START/ENTER>.
The calibration display for the next buffer appears.
7 For single-point calibration, select Exit with one point calibra-
tion with <
▲
> <
▼
> and confirm with <START/ENTER>.
The calibration is completed as a single-point calibration.
The new calibration values are displayed as an informative
message (
i
).
You have the following options:
z
Accept the new calibration values with <START/ENTER>.
Subsequently, the calibration record is displayed and output
to the interface at the same time.
z
To switch to the measured value display without accepting
the new calibration values, press <M> (short pressure) or
<ESC>.
i
Buffer value = 7.00
i
U = 3 mV
i
Temperature = 24.8 °C
Terminate AutoRead
pH & ORP \ Calibration
i
Buffer recognition TEC
i
Immerse sensor in buffer 2
Exit with one point calibration
Continue
pH & ORP \ Calibration