GreenPrima PROCON2000 Industrial Colorimeter for Pulp & Paper Applications

Overview

The GreenPrima PROCON2000 Industrial Colorimeter is a dedicated optical measurement instrument engineered for continuous, reagent-free colorimetric analysis in pulp and paper manufacturing processes. It operates on the principle of UV-VIS absorption spectroscopy—measuring absorbance across the 380–780 nm spectral range to quantify color intensity in aqueous process streams according to standardized Pt-Co (Platinum-Cobalt) units. Unlike conventional visual comparison methods or single-wavelength photometers, the PROCON2000 employs a stabilized xenon flash lamp and high-resolution CCD spectrometer to capture full-spectrum transmission data, enabling robust compensation for turbidity, suspended solids, and matrix interferences commonly encountered in bleached pulp effluents, whitewater recirculation loops, and wastewater discharge points. Its design prioritizes long-term stability in aggressive industrial environments, with optical path integrity maintained through quartz flow cells and chemically resistant wetted materials.

Key Features

• Reagent-free operation: Eliminates chemical consumption, hazardous waste generation, and calibration drift associated with wet-chemistry methods.
• Multi-mode measurement flexibility: Supports manual spot checks, programmable time-based sampling (e.g., every 5/15/60 minutes), and event-triggered acquisition synchronized with process logic controllers.
• Ultra-low maintenance architecture: Xenon light source rated for >10 years (≥10⁸ flashes); no consumables such as filters, reagents, or electrodes required.
• Interference-resistant fluidic design: Patented laminar-flow cell geometry minimizes particle settling and cross-contamination from suspended solids (e.g., fiber fines, fillers, or precipitated calcium carbonate).
• Sub-5-second measurement cycle: Full spectral acquisition, baseline correction, and Pt-Co calculation completed within <5 seconds—enabling real-time feedback for closed-loop control of bleaching chemistry or whitewater quality.
• Intelligent self-management: Fully automated zeroing, calibration verification, optical path cleaning via integrated air-pulse purge, and fault diagnostics with auto-recovery protocols.
• Pre-treated sample handling: Integrated passive filtration and bubble removal module requires no scheduled servicing or operator intervention under normal operating conditions.

Sample Compatibility & Compliance

The PROCON2000 is validated for direct inline or sidestream measurement of process liquids including alkaline and acidic pulp suspensions (up to 1.5% consistency), bleach plant filtrates, paper machine whitewater, and final effluent streams. Wetted components—including flow cell windows, tubing, and seals—are constructed from fused quartz, polypropylene (PP), FPM fluoroelastomer, 316L stainless steel, and borosilicate glass—ensuring compatibility with chlorine dioxide, hydrogen peroxide, sodium hydroxide, and sulfuric acid at typical process concentrations and temperatures (0–50 °C). The instrument complies with ISO 7887:2011 (Water quality — Examination and determination of colour), ASTM D1209 (Standard Test Method for Color of Clear Liquids), and EN ISO 7887-2 for instrumental colorimetry. Its controller firmware supports audit trails, electronic signatures, and configurable user roles aligned with FDA 21 CFR Part 11 requirements for regulated environments.

Software & Data Management

The embedded controller features an 8.5-inch TFT color touchscreen (800 × 480 resolution) with intuitive HMI navigation optimized for glove-compatible operation in production areas. All measurement metadata—including raw spectra, Pt-Co values, temperature, pressure, and diagnostic logs—are timestamped and stored on an internal 8 GB SD card. Data export is supported via USB mass storage or Modbus RTU over RS485 (configurable as Master or Slave) for integration into DCS, SCADA, or MES platforms. Analog 4–20 mA output provides galvanically isolated, NIST-traceable signal transmission with ≤0.5% full-scale accuracy. Relay outputs support configurable alarm thresholds (e.g., exceedance of discharge limits per local environmental permits) with fail-safe NO/NC configurations rated for 277 VAC.

Applications

• Real-time monitoring of brightness and chroma in alkaline peroxide mechanical pulp (APMP) and elemental chlorine-free (ECF) bleaching stages.
• Whitewater quality control on paper machines to maintain consistent sheet formation and reduce filler retention variability.
• Effluent compliance tracking against regulatory Pt-Co limits (e.g., EU WFD, US EPA NPDES) without laboratory delay.
• Optimization of chemical dosing in deinking plants by correlating color reduction with hydrogen peroxide or sodium hydrosulfite consumption.
• Trend analysis of color build-up in closed-loop water systems to schedule blowdown or membrane cleaning cycles.

FAQ

Does the PROCON2000 require periodic recalibration with certified standards?
Yes—while the system performs automatic optical zeroing and reference validation daily, traceable calibration using NIST-certified Pt-Co standard solutions is recommended every 3 months or after maintenance events involving optical path access.
Can it operate reliably in high-turbidity whitewater with fiber content above 0.8%?
The flow cell’s laminar design and spectral deconvolution algorithms mitigate scattering effects; however, for streams exceeding 1.2% consistency, optional inline dilution or centrifugal pre-separation is advised per application engineering review.
Is the instrument suitable for Class 1 Div 1 hazardous locations?
The base configuration is rated for safe-area use (IP65); ATEX Zone 1 or Zone 2 certification is available as a factory-configured option with intrinsic safety barriers and explosion-proof enclosure variants.
How is temperature compensation handled during measurement?
An integrated Pt100 sensor monitors sample temperature in real time; spectral corrections are applied dynamically using polynomial coefficients derived from multi-temperature validation studies per ISO 7887 Annex B.
What is the maximum allowable backpressure for sidestream installation?
The flow cell is rated for continuous operation at ≤2 bar static pressure; transient spikes up to 3 bar are tolerated for <5 seconds without performance degradation.