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The Zetasizer WT is a fully automated system that delivers lab quality on-line zeta potential measurements. This enables real-time monitoring of flocculation process performance and efficient charge neutralization.
The Zetasizer WT combines Malvern Panalytical’s industry leading Electrophoretic Light Scattering technology with two decades of expertise with in-process measurements to produce a dedicated on-line zeta potential analyzer for water treatment plants.
|Sample flow rate||100 - 350 LPH (fast loop)|
|Sample flow rate||0.5 - 2 LPM (measurement)|
|Measurement type||Zeta potential|
|Measurement principle||Laser Doppler micro-electrophoresis|
|Result output frequency||3 minutes typical, programmable|
|Range of zeta potential measurement||+/- 500 mV (+/- 90 mV on HMI interface)|
|Size range||3.8 nm to 100µm|
|Enclosure rating||IP54, indoor use. Limited capability to NEMA 4X|
|Power||90 - 132 VAC, 180 - 264 VAC, 50 - 60 Hz, 6 A|
|Dimensions (W, D, H)||855 x 686 x 1720mm|
|Compressed air purge||1.5LPM, 6-10 bar, ISO 8573-1:2010 [0.7.2] (optional)|
|Temperature range||0°C to 40°C|
|Maximum sample pressure||6 bar|
Eliminate sample cross contamination between zeta potential measurements using a completely disposable cell.
The zeta potential of colloids and molecules is extremely sensitive to contamination from components of a previous sample used in a measurement cell. The use of a disposable cell completely eliminates this potential contamination issue.
The folded capillary cell provides the benefits of the accuracy of measurement of a capillary cell with the ease of use of a disposable cell.
Although, disposable, including the electrodes, for low conductivity samples each cell can be used for hundreds of measurements if required.
The cell can be used with the autotitrator, where multiple measurements are routinely done over a wide pH range.
The Zetasizer WT connects to a sample stream coming from the plant after coagulants have been added and mixed into the water. The system uses a pump to flow a sample through the analyzer`s flow cell where zeta potential measurements are made. Sample is then pumped into waste or returned back into the process and replaced with a fresh sample in a continuous, automatic cycle.
Automation and analysis is controlled by an on-board industrial computer running Malvern Panalytical Link II software.
Measurement results are displayed on a local HMI screen as well as exported into plant SCADA via OPC, Modbus TCP/IP or wired 4-20mA connections.
Results are used by treatment plant operators or a plant control system to adjust coagulant dose required to keep zeta potential in a pre-determined range – typically between zero and a slight negative charge.
Zetasizer WT also allows easy measurement of grab samples from other areas in the process, effectively doubling as a laboratory system.