KROHNE SMARTPAT PH 8530, Handbook

Page: 47 / 52

APPENDIX
9
47
SMARTPAT PH 8530
www.krohne.com 03/2016 - 4002544803 - MA SMARTPAT PH 8530 R03 en
9.1 pH as a function of mV
The pH-value is the negative decadative logarithm of the hydrogen ion concentration, and it is
directly related to the proportion of hydrogen ions H
+
to hydroxide ions OH
-
in the media. The pH-
sensor measures excess or deficit of the hydrogen ions and gives a proportional millivolt signal
as output. The signal is 59.16 mV per 1 pH at 25
°
C / 77
°
F. In clean water there is a total balance
between hydrogen ions and hydroxide ions, the output from the electrode is 0.0 mV and pH is 7.
The millivolt signal is measured by the pH sensor and the corresponding pH value is calculated
in the signal converter.
mV pH
H
+
ions [mol/l] OH
-
ions [mol/l]
Example
414 0 1 0.00000000000001 Sulfuric acid
355 1 0.1 0.0000000000001
296 2 0.01 0.000000000001 Coca Cola
237 3 0.001 0.00000000001 Vinegar
177 4 0.0001 0.0000000001 Orange juice
118 5 0.00001 0.000000001
59 6 0.000001 0.00000001 Milk
0 7 0.0000001 0.0000001 Clean water
-59 8 0.00000001 0.000001 Sea water
-118 9 0.000000001 0.00001
-177 10 0.0000000001 0.0001
-237 11 0.00000000001 0.001
-296 12 0.000000000001 0.01
-355 13 0.0000000000001 0.1
-414 14 0.00000000000001 1 Sodium hydroxide