GreenPrima Aqualysis 800 Online Water Hardness and Alkalinity Analyzer

Overview

The GreenPrima Aqualysis 800 is a fully automated, photometric titration-based online analyzer engineered for continuous, real-time monitoring of total hardness (Ca²⁺ + Mg²⁺ as CaCO₃) and total alkalinity in industrial and pharmaceutical water systems. It operates on the principle of endpoint detection via colorimetric titration—where a standardized chelating or acid titrant is dosed into the sample until stoichiometric completion, and absorbance changes at specific wavelengths (typically 525 nm or 610 nm, depending on indicator chemistry) are quantified using a high-stability LED-photodiode optical system. This method complies with foundational principles outlined in ASTM D1126 (Standard Test Method for Hardness in Water) and ISO 9963-1 (Water quality — Determination of hardness — Part 1: Titrimetric method using EDTA), ensuring metrological traceability and regulatory acceptability in GMP and GLP environments. Designed for unattended operation in demanding utility water loops—including boiler feedwater, cooling tower circuits, reverse osmosis permeate, and purified water distribution systems—the Aqualysis 800 delivers stable, interference-resistant measurements without manual intervention.

Key Features

• Photometric titration architecture with dual-wavelength optical path compensation for turbidity and background color correction
• Bilingual (English/Chinese) 4.3-inch color LCD interface with intuitive menu navigation and real-time trend visualization
• Compact footprint (400 × 300 × 180 mm) and IP65-rated enclosure suitable for installation in mechanical rooms, utility corridors, or outdoor enclosures
• Low-reagent consumption design: typical reagent usage ≤ 1.2 mL per analysis cycle; full reagent kit supports ≥ 3,000 analyses
• Configurable measurement interval (0–360 minutes) and programmable rinse duration (15–1800 seconds) to optimize maintenance intervals and data resolution
• Four independent relay outputs (250 VAC / 4 A) for direct integration with softener regeneration controllers, alarm panels, or SCADA interlocks
• Dual digital inputs (IN1/IN2) enabling external synchronization with process events—e.g., triggered sampling upon pump activation or conductivity deviation
• Embedded non-volatile memory stores ≥ 10,000 timestamped measurement records with full audit trail (date, time, result, status flags)

Sample Compatibility & Compliance

The Aqualysis 800 is validated for use with low-turbidity aqueous streams meeting defined physicochemical constraints: pH 4–10, temperature 5–40 °C, and pressure 0.2–6 bar (optimal 1–2 bar). Critical interference thresholds—Fe < 3 ppm, Cu < 0.2 ppm, Al < 0.1 ppm, Mn < 0.2 ppm—are aligned with USP “Water for Pharmaceutical Purposes” guidance and EP 2.2.43 “Water for Injection” specifications. When deployed in pharmaceutical purified water (PW) or water for injection (WFI) loops, the instrument supports 21 CFR Part 11-compliant data integrity when paired with GreenPrima’s optional MCS-series multi-channel selector and certified software modules (audit trail, electronic signature, role-based access control). All hardness and alkalinity reagents (TH-series and TC-series) are CE-marked, ISO 17025-accredited reference material traceable, and supplied in hermetically sealed, light-protected cartridges to ensure shelf-life stability (>18 months unopened).

Software & Data Management

Data export and remote supervision are supported via standard industrial protocols. The built-in RS485 port implements Modbus RTU (slave mode), enabling seamless integration into PLC-based DCS or cloud-connected IIoT platforms (e.g., Siemens Desigo, Honeywell Experion, or Azure IoT Edge). The 4–20 mA analog output is factory-calibrated and linear across the full 0.447–625.8 ppm range (as CaCO₃), eliminating need for field scaling. Internal firmware includes configurable alarm logic (high/low limits, rate-of-change alerts, sensor fault diagnostics) with event logging and email/SMS notification capability via optional Ethernet gateway. All configuration changes, calibration events, and measurement anomalies are time-stamped and stored in an immutable log—fully compliant with ALCOA+ (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) data governance requirements.

Applications

• Continuous hardness monitoring in boiler feedwater pretreatment to prevent scale formation in economizers and steam drums
• Real-time alkalinity tracking in cooling tower blowdown control to maintain Langelier Saturation Index (LSI) within safe operational bounds
• Final quality verification of softened water from ion exchange units prior to distribution to production lines
• GMP-compliant hardness surveillance in PW/WFI loops per EU Annex 1 and FDA Guidance for Industry (2022)
• Automated feedback control of antiscalant dosing systems in RO skids using proportional-integral (PI) logic
• Regulatory reporting support for ISO 50001 energy management systems, where water treatment efficiency directly impacts thermal efficiency metrics

FAQ

What measurement principle does the Aqualysis 800 employ?
It uses photometric titration with endpoint detection—EDTA-based titration for hardness and strong acid titration for alkalinity, measured via absorbance shift at defined wavelengths.
Is the instrument compatible with existing SCADA or DCS infrastructure?
Yes—via native Modbus RTU over RS485 and isolated 4–20 mA output, both configurable for engineering units (ppm, °dH, mmol/L) and alarm states.
How often does the system require maintenance or recalibration?
Under typical operating conditions (≤ 200 ppm hardness, filtered feed), scheduled maintenance is recommended every 6 months; calibration verification is performed automatically before each analysis cycle using internal reference standards.
Can the Aqualysis 800 measure both hardness and alkalinity simultaneously?
No—it performs sequential single-parameter analysis per cycle; however, dual-mode operation (hardness → alkalinity or vice versa) can be scheduled via time-based or external trigger logic.
Does it meet FDA 21 CFR Part 11 requirements for electronic records?
Yes—when used with GreenPrima’s validated firmware version 3.2+ and configured with password-protected user roles, electronic signatures, and full audit trail export functionality.