Yokogawa PH72 Personal pH/ORP Meter - Manual (Page 70)

IM 12B03D02-01E
9-3
9. Technical Information
Internal solution side Sample solution side
Hydrated layers on glass
Boundary layers
i
e
S
e
H
+
H
+
F0902.EPS
Figure 9.2 Diagram of Glass Membrane
-400
-500
pH
2 0
E (mV)
-300
-200
-100
0
100
200
300
400
500
4 6 8 10 12 14
F0903.EPS
Alkaline error
Figure 9.3 Relationship between Glass Electrode Potential and pH