wtw Multi 350i, Operating Manual

Page: 35 / 108

Multi 350i Operation
33
Calibration evaluation After calibrating, the measuring instrument automatically evaluates the
calibration. The asymmetry and slope are evaluated separately. The
worse evaluation of both is taken into account. The evaluation appears
on the display and in the calibration record.
Preparatory activities Perform the following preparatory activities when you want to calibrate:
Display Calibration
record Asymmetry
[mV] Slope
[mV/pH]
+++ -15 ... +15 -60.5 ... -58
++ -20 ... +20 -58 ... -57
+ -25 ... +25 -61 ... -60.5
or
-57 ... -56
- -30 ... +30 -62 ... -61
or
-56 ... -50
Clean the electrode according
to the electrode operating
manual
Error Error
< -30 or
> 30 < -62 or
> -50
Perform error elimination ac-
cording to chapter 6 W
HAT TO
DO IF
...
1 Connect the pH electrode to the measuring instrument.
The pH/ISE measuring window is displayed.
2 Keep the buffer solutions ready. Adjust the temperature of the
buffer solutions, or measure the current temperature, if you
measure without a temperature sensor.