KROHNE OPTISENS PAS 2000 EN - Manual (Page 38)

8
APPENDIX
38
OPTISENS PAS 2000
www.krohne.com 11/2008 • MA PAS 2000 R04 en
Appendix
8.1 pH as a function of mV
The pH-value is the negative 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-
electrode 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 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 PAS 2000 pH and the corresponding pH is calculated in
MAC 080.
mV pH H + ions, mol/l OH - ions, mol/l Example
414 0 1 0.00000000000001
355 1 0.1 0.0000000000001
296 2 0.01 0.000000000001 Coca Cola
237 3 0.001 0.00000000001
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 Blood
-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 Sulfa
.book Page 38 Friday, November 28, 2008 2:32 PM