Orbisint CPS11D and CPS11
2
Hauser
Function and system design
Measuring principle
pH measurement
The pH value is used as a unit of measurement for the acidity or alkalinity of a liquid medium. The
membrane glass of the electrode supplies an electrochemical potential which is dependent upon the
pH value of the medium. This potential is generated by the selective penetration of H
+
ions through
the outer layer of the membrane. An electrochemical boundary layer with an electric potential forms
at this point. An integrated Ag/AgCl reference system serves as the required reference electrode.
The transmitter converts the measured voltage into the corresponding pH value using the Nernst
equation.
Measuring system
A complete measuring system comprises at least the following components:
• pH electrode CPS11D or CPS11
• Transmitter, e.g. Liquiline CM42, CM44x, Mycom S CPM153, Liquisys M CPM2x3
• Memosens data cable CYK10 for Memosens sensors or CPK9 for analog sensors
• Immersion, flow or retractable assembly, e.g. Cleanfit CPA871
3
4
1
2
A0025757
1
Example of a measuring system for pH measurement
1
Retractable assembly Cleanfit CPA871
2
pH electrode CPS11D
3
Memosens data cable CYK10
4
Liquiline M CM42 two-wire transmitter for hazardous area
Summary of Contents for Orbisint CPS11
Page 12: ...www addresses endress com...
