Siemens Rapidlab 1200 Operator's Manual page 61

Rapidlab 1200 Operator's Guide: System Overview and Intended Use
The potassium sensor membrane is designed as a charge separator. The positively
charged potassium ions selectively interact with the membrane when the sample
interfaces with the membrane. The negatively charged chloride ions do not
interact with the membrane. The charge separation causes the membrane potential
measured by the electrochemical cell.
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Figure 1-34
Internal electrolyte solution
Membrane
Electrolyte solution
Randomly oriented ions
Illustrated Electrolyte Sensor
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02087462 Rev. V