Xylem handylab pH 12 - Manual (Page 22)

Operation handylab pH 12
22 ba75368e04 01/2011
Calibration
evaluation
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.
Preparatory
activities
Display Asymmetry
[mV] Slope
[mV/pH]
-15 ... +15 -60.5 ... -58
-20 ... +20 -58 ... -57
-25 ... +25 -61 ... -60.5
or
-57 ... -56
Clean the electrode according
to the electrode operating
manual
-30 ... +30 -62 ... -61
or
-56 ... -50
E3
Eliminate the error according to
chapter 6 W
HAT TO DO IF ...
< -30 or
> 30 < -62 or
> -50
1 Switch on the measuring instrument with .
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.