Laboratory Charge Analyzer (Pulp & Paper)

LCA-1P/2P/3P Overview

The Laboratory Charge Analyzer (LCA) for Pulp & Paper applications (LCA-P Series) are essential wet-end chemistry tools for papermaking processes, allowing for a quick determination of the cationic charge demand. This allows the user to determine the ideal dosage needed to achieve optimum wet strength additive performance. Chemtrac offers three models:

  •  LCA-1P which requires a manual titration
  •  LCA-2P with automatic titration using a built-in pump and a single titrant (Cationic or Anionic)
  •  LCA-3P which is equipped with two titrant pumps (for both Cationic and Anionic titrants) allowing for automatic titration, with automatic switching between anionic
    and cationic titrants depending on the charge of the water sample.
The LCA is portable and simple to use, and gives repeatable charge demand results time after time.

  • Description

    The Laboratory Charge Analyzer for Pulp and Paper applications (LCA-P), is also referred to by some people in the industry as a Particle Charge Detector.

    The process of finding the optimum wet strength additive dosage simply involves feeding a measured volume of coagulant into the process water sample and performing a titration (manual or automatic) until reaching a zero charge. That identifies the charge demand in microequivalents per liter (ueq/L) or parts per million (ppm).

    Titration of the additives adjustment additives can be performed manually using the LCA-1P, or with the touch of a button using the auto-titration features that come standard on models LCA- 2P and LCA-3P. The automatic titration feature simplifies the testing process and helps ensure the most accurate results possible.

    The LCA-P uses the Streaming Current principle to accurately measure the elektrokinetic charge from dissolved colloidal substances, and the ionic charge, in aqueous solutions. The wet end cationic charge demand is determined with a polyelectrolyte (most commonly poly DADMAC) titration to the isoelectric point (zero charge). The charge demand results (ueq/L or ppm) can be found in a matter of minutes (charge demand is also sometimes determined using a more labor intensive and time consuming measurement, Zeta Potential). 

    Based on the LCA results, optimal wet strength additive dosages are determined and applied in
    the papermaking process.

    Standard Features

    • All Models (LCA-1P, LCA-2P, LCA-3P)
    • Accommodates samples from 10 to 40 mL
    • Simple to remove probe and piston
    • Includes 300 micron strainer, 400 mL beaker, 30 mL syringe
    • LCA-2P
    • Built in titrator, single titrant pump
    • LCA-3P
    • Built in titrator, single titrant pump
    • Cationic and Anionic titration

    Optional Features

    • Rollaway case for transporting unit


    • Quickly determine charge demand of a sample
    • Allows for trending of wet end charge to aid in optimization of additives

  • Downloads

  • Specifications

    Display LCD, Monochrome with backlight
    Sensor Type Immersion, quick connect
    Materials Contacting Sample Delrin, stainless steel (Teflon Optional)
    Sample Volume 200 to 2,000 mL
    Power Requirements 110 VAC 60 hz, 1A; 220 VAC 50 hz, 1A (optional)
    Operating Temp 34 – 120 F (0 – 50 C)
    Dimensions 8.5” W x 17.8” H x 9.2” D
    (216 mm W x 425 mm H x 234 mm D) (Unit fully extended)
    8.5” W x 26” H x 9.2” D
    (216 mm W x 660 mm H x 234 mm D)
    Weight 20 lbs (9.1 kg)

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