Patent ID: 7368053

Claim:
A membrane zeta potential measuring system, comprising: a first module having a first route and a first detector, wherein said first detector measures the potential of the fluid in said first route that has flowed through the pores of a membrane that is to be measured and generates a first potential signal; a second module having a second route and a second detector, wherein said second detector measures the potential of the fluid in said second route and generates a second potential signal; a first sample-holding module having a first channel, wherein said first sample-holding module is located between said first module and said second module and holds tight said membrane; a first measuring course to measure the zeta potential of the membrane pores, said first measuring course is formed by said first route, said first channel and said second route; a third module having a third detector and a fourth detector; a second sample-holding module having a second channel, wherein said second sample-holding module is located between said first module and said third module and holds tight two parallel membranes that are to be measured; a second measuring course to measure the zeta potential of the membrane surface, said second measuring course is formed by said first route and said second channel, said third detector measures the potential of the fluid at an inlet of said second channel and generates a third potential signal, said fourth detector measures the potential of the fluid at an outlet of said second channel and generates a fourth potential signal; and a voltmeter to receive said first and second potential signals to calculate a first potential drop from which the zeta potential of the pores of said membrane is then evaluated; similarly, said voltmeter receives said third and fourth potential signals to calculate a second potential drop from which the zeta potential of the surface of said membrane is then evaluated.