Xylem MULTI 1970I PORTABLE MULTIPARAMETER METERS - Manual (Page 25)

Multi 1970i Operation
23
Calibration evaluation After calibrating, the measuring instrument automatically evaluates the
calibration. The asymmetry and slope are evaluated separately. 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
Perform error elimination ac-
cording to chapter 6 W
HAT TO
DO IF ...
< -30 or
> 30 < -62 or
> -50
1 Connect the pH electrode to the measuring instrument.
If necessary, press the <M> key repeatedly until the status dis-
play pH (pH measurement) or U (measurement of the ORP
voltage) appears.
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).