Operation
pHotoFlex
®
Turb
52
ba75976e07
09/2021
Preparatory activi-
ties
Perform the following preparatory activities when you want to calibrate:
4.6.6 Carrying out the TEC and NIST/DIN calibration
The two calibration procedures only differ in the use of different buffer sets
(see section 4.6.5). Make sure that, in the
pH & ORP
/
Calibration
menu, the
Calibr. type
is correctly set (see section 4.6.4).
For this procedure, use any two or three WTW Technical buffer solution in as-
cending or descending order.
Below, the
TEC
calibration is described. With
NIST/DIN
calibration, the
NIST/
DIN
buffer recognition and other buffer nominal values are displayed. Apart
from that, the procedure is identical.
-
-30 ... +30
-62 ... -61
or
-56 ... -50
Clean the electrode according to
the electrode operating manual
----
----
< -30 or
> 30
... -62 or
... -50
Perform error elimination accord-
ing to chapter 6 W
Display
Calibration
record
Asymmetry
[mV]
Slope [mV/pH]
1 Connect the pH electrode to the meter.
The pH measured value is shown on the display.
2 Keep the buffer solutions ready. Adjust the temperature of the buffer
solutions, or measure the current temperature, if you measure with-
out a temperature sensor.
The TEC calibration at pH 10.01 is optimized for the WTW Tech-
nical buffer solution TEP 10 Trace or TPL 10 Trace. Other buffer
solutions could cause the calibration to be erroneous. The correct
buffer solutions are available in the WTW catalog or on the Inter-
net.
1 Press the
<M>
key (short pressure) repeatedly until the measured pa-
rameter,
pH
or
ORP
is selected.
