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SYSTEM DESCRIPTION

The ECA 2100/ECAT 2100 accurately measures colloidal and ionic charge of the wet end using the streaming current principle, 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.

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 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. Counterions surround these particles. The motion of the piston generates shear forces, which causes the counterions to migrate. Electrodes in the probe measure the flow of counterions, 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 anionic sample.

CHARGE DEMAND (ISOELECTRIC TITRATION)

The ECA 2100/ECAT 2100 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 operators understanding of the titration in real time.

ACCESSORIES

Two delrin probes
Two teflon pistons
500ml bottle of .001N Poly Dadmac
500ml bottle of .005N Poly Dadmanc
Probe cleaning brush
250 ml beaker
Two Syringes
Magnetic stirrer assembly
Hard shell portable carry case
Operations Manual