Online Charge Analyser and Laboratory Charge Analyser
Laboratory Charge Analyser ECA 2100
System Description
The ECA 2100 laboratory charge analyser accurately measures colloidal and ionic charge of the wet end using the streaming current principle (electro kinetic charge), which is comparable to zeta potential. Charge demand is determined with polyelectrolyte titration to the isoelectric point, either manually or by use of an automatic titrator.
Laboratory Charge Analyser Benefits
- LabTrac - accompanying software for extracting and analyzing titration data
- A user-friendly touch screen
- Sample volume range of 10-200 ml for greatest accuracy
- Sturdy housing for easy mobility, quick set-up, and bench-top stability
- Detachable probe to facilitate cleaning and prevent corrosion
- Simplistic interfacing with automatic titrators
- Gain control to amplify low level signals
- Sensitivity adjustment for highly conductive samples
- Zero offset to customize data sets
Streaming Current Principle
The measurement cell of the ECA Laboratory charge analyser consists of a reciprocating teflon piston in a probe assembly. Particles and dissolved materials are attracted to the surfaces of the probe by Van Der Waals forces. Counter ions surround these particles. The motion of the piston generates shear forces, which causes the counter ions to migrate. Electrodes in the probe measure the flow of counter ions, inherently defined as an electrical current. The current is electronically processed and displayed on the touchscreen as the Streaming Current Value (SCV). For most samples in a paper mill, the SCV will be negative, indicating a net anionically charged sample.
Charge Demand (Isoelectric Titration)
The ECA 2100 lab charge analyser allows the operator to determine the charge demand of a sample. Charge demand is quantified by adding a polymer of opposite charge to the sample until the SCV equals zero, which is defined as the isoelectric point. Addition of the polymer (or process additive) can be achieved by hand or automatic titration. The SCV can be displayed as a function of time on the touchscreen. Whether in the form of a graph or data table, this increases the operator's understanding of the titration in real time.
Online Charge Analyser ECT 9800 System Description
The instrument incorporates streaming current technology to produce a measurement of electrokinetic charge (ionic & colloidal) using a sample obtained from various points in the process (Headbox, Coated Broke, Machine Chest, Tray Water, etc..). The online charge analyzer sample is then titrated with a low molecular weight polymer of the opposite charge to bring the sample to a neutral charge. The amount of titrant consumed by the sample is used to quantify the level of charge (anionic or cationic) present in the furnish. The result, given as Online Charge Demand, can be used to effectively control the addition of cationic additives (starch, polymers, coagulants, etc.) in order to stabilize charge disturbances. Reducing or even eliminating online charge variability stabilizes the wet end and helps optimize and reduce feed rates of expensive additives while also improving paper qualities.
Online Charge Analyser Benefits
- Optimize the wet end process
- Quantify level of “Anionic Trash”
- Identify sources of charge distrubances
- Control charge variability
- Improve first pass retention
- Stabilize white water consistency
- Ensure consistent product properties
- Optimize polymer/coagulant feeds
- Increase machine production
Standard Features
- Three (3) process points sampling thickstock sampling (Up To 5%)
- Measures charge and charge demand
- Optional pH and conductivity sensors
- Two titrant pumps, two 8L titrant jugs
- Low maintenance, improved reliability
- Web access controller w/ Web pad
- Ethernet connectivity
- Analog/digital I/O’s
Laboratory Charge Analyser and Online Charge Analyzer Applications
- Tissue
- Fine paper
- Speciality papers
- Coated papers
- Linerboard
- Newsprint
For UK and all other enquiries:
sales@processinstruments.net
For North American enquiries:
salesna@processinstruments.net
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