wtw pH 3300i 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 evaluated sep-
arately. 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 current tem-
perature if the measurement is made without temperature sensor.
Asymmetry
[mV]
-15 ... +15
-20 ... +20
-25 ... +25
-30 ... +30
< -30 or
> 30
...
pH 3300i/3400i
Slope
[mV/pH]
-60.5 ... -58
-58 ... -57
-61 ... -60.5
or
-57 ... -56
-62 ... -61
or
-56 ... -50
... -62 or
... -50
ba75682e02 03/2008