Endress+Hauser CPM280 Manual Del Usuario página 25

CPM280
Display
E3 (invalid calibration)
7. Switch back to the measuring mode with <M>.
Three-point calibration
1. Perform steps 1 to 6 as in the two-point calibration.
2. Immerse the pH electrode into the third buffer solution.
3. Press <RUN/ENTER>.
The AutoRead measurement begins. The electrode voltage (mV) or the buffer nominal val-
ue appears on the display. If the measured value is stable, the instrument displays the value
of the slope and the evaluation of the calibration in calibration range II.
4. Press <RUN/ENTER> again.
COM280 displays the asymmetry in calibration range II.
Endress+Hauser
Asymmetry[mV]
-15 to +15
-20 to -15
+15 to +20
-25 to -20
+20 to +25
-30 to -25
+25 to +30
< -30 or > +30
Slope [mV/pH]
-60.5 to -58
-58 to -57
-61 to -60.5
or
-57 to -56
-62 to -61
or
-56 to -50
< -62 or > -50
Commissioning
25