wtw pH 3150i Operating Manual page 18

Operation
Calibration evaluation
18
After the calibration, the measuring instrument automatically evaluates
the current status of the electrode. The asymmetry and slope are
evaluated 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 Connect the pH electrode to the measuring instrument.
2 Keep the buffer solutions ready.
3 Adjust the temperature of the solution and measure the current
temperature if the measurement is made without the use of a
temperature sensor (the TP display indicator is missing from
the display).
Asymmetry
[mV]
-15 ... +15
-20 ... +20
-25 ... +25
-30 ... +30
< -30 or
> 30
...
pH 3150i
Slope
[mV/pH]
-60.5 ... -58
-58 ... -57
-61 ... -60.5
or
-57 ... -56
-62 ... -61
or
-56 ... -50
... -62 or
... -50