pHotoFlex
®
Turb
Operation
59
ba75976e07
09/2021
Display with mea-
suring range over-
flow
If the measured value is outside the measuring range of the
pHotoFlex
®
Turb, it is indicated on the display:
4.7.4 Calibration
When to calibrate?
Regularly every 90 days
With a temperature change
Calibration proce-
dure and calibra-
tion standards
For the menu-guided three-point calibration, you need the following three cal-
ibration standards in the specified order:
To keep the drift as low as possible, the time for aligning the cell
while the
<START/ENTER>
key is pressed is limited to 30 sec-
onds. After this time, the meter starts the measurement or cali-
bration automatically.
8 Release the
<START/ENTER>
key.
Measurement starts. The measured value is displayed.
9 Repeat the steps 2 to 8 for further samples.
Turbidity
157.0
FNU
NTU
01.02.05 15:12
Turbidity
> 1100
FNU
NTU
01.02.05 15:12
Standard no. NTU/FNU
1 1000
2 10.0
3 0.02
