wtw 330i Operating Manual page 20

Operation
Calibration evaluation
Preparatory activities
20
After the calibration, the measuring instrument automatically evaluates
the current status of the electrode. The asymmetry and slope are eval-
uated separately. The worst evaluation appears on the display.
Display
Clean the electrode according
to the electrode operating
manual
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF
1 Switch on the measuring instrument with <ON/OFF>.
2 Connect the pH electrode to the measuring instrument.
3 Keep the buffer solutions ready.
4 Adjust the temperature of the solutions and measure the cur-
rent temperature if the measurement is made without temper-
ature sensor.
Asymmetry
[mV]
-15 ... +15
-20 ... +20
-25 ... +25
-30 ... +30
< -30 or
> 30
...
pH 330i/340i
Slope
[mV/pH]
-60.5 ... -58
-58 ... -57
-61 ... -60.5
or
-57 ... -56
-62 ... -61
or
-56 ... -50
... -62 or
... -50