GreenPrima Aqualysis 800PA Phenolphthalein Alkalinity Analyzer

Overview

The GreenPrima Aqualysis 800PA Phenolphthalein Alkalinity Analyzer is a fully automated, benchtop-to-industrial inline analyzer engineered for precise, continuous determination of phenolphthalein alkalinity (P-alkalinity) in aqueous process streams. It operates on the principle of potentiometrically guided acid–base titration coupled with photometric endpoint detection—specifically calibrated to the pH 8.3 transition point where phenolphthalein indicator undergoes its characteristic color shift from pink to colorless. This method conforms to standard water analysis protocols including ISO 9963-1, ASTM D1067, and APHA Standard Methods 2320 B. The instrument integrates a microprocessor-controlled fluidic system comprising precision peristaltic metering pumps, solenoid valves, optical flow cells, and a high-stability LED-based spectrophotometer. All analytical steps—including sample aspiration, acid titration (using standardized HCl solution), indicator dosing, mixing, photometric measurement, and endpoint calculation—are executed autonomously without operator intervention.

Key Features

• Automated titration–photometry hybrid methodology ensures robust endpoint resolution under variable turbidity or low-conductivity conditions
• Integrated touchscreen control unit (color LCD, bilingual English/Chinese interface) with intuitive navigation and real-time status visualization
• Compact footprint (400 × 300 × 180 mm; 4 kg) and IP65-rated enclosure suitable for semi-outdoor or utility corridor installation
• Low reagent consumption ( 6 months under typical operation)
• Flexible operational modes: continuous monitoring or programmable interval analysis (1–360 minutes)
• Four programmable relay outputs (250 VAC / 4 A max) for alarm signaling, pump control, or PLC interfacing
• Two digital inputs supporting external trigger signals (e.g., flow pulse, start/stop command)
• Comprehensive data logging: onboard storage for >10,000 measurement records with timestamp, fault codes, and calibration history
• Standard analog (4–20 mA) and digital (RS485 Modbus RTU) outputs for integration into SCADA, DCS, or LIMS environments

Sample Compatibility & Compliance

The Aqualysis 800PA is validated for use with industrial cooling waters, boiler feedwater, blast furnace gas scrubber effluents, and recirculating process waters meeting defined physicochemical constraints: sample pH 4–10, temperature 5–40 °C, pressure 0.2–5 bar (optimal 1–2 bar), and trace metal limits (Fe < 3 ppm, Cu < 0.2 ppm, Al < 0.1 ppm, Mn < 0.2 ppm). Its design complies with IEC 61326-1 (EMC for laboratory and industrial use) and IEC 61000-6-2/-4 (immunity to electrostatic discharge, surges, and conducted RF disturbances). For regulated environments, audit trails, user access levels, and electronic signature support align with FDA 21 CFR Part 11 requirements when paired with optional software modules.

Software & Data Management

Firmware includes embedded diagnostics for valve actuation verification, pump stroke validation, photometric baseline drift compensation, and automatic zero/span calibration routines. Measurement data are timestamped and stored locally with configurable retention policies. Optional PC-based configuration software enables remote parameter editing, firmware updates, trend charting, and CSV export. All communication interfaces support secure protocol handshaking and cyclic redundancy checks (CRC) to ensure data integrity across plant networks.

Applications

Primary deployment domains include metallurgical gas cleaning systems (e.g., basic oxygen furnace scrubber water), open- and closed-loop cooling circuits in power generation and steelmaking, low-pressure boiler feedwater conditioning, and municipal wastewater tertiary treatment polishing stages. The analyzer supports dynamic alkalinity control strategies—such as acid dosing feedback loops—to maintain optimal carbonate/bicarbonate equilibrium and prevent scale formation or corrosion in heat exchangers and piping networks.

FAQ

What alkalinity parameters does the Aqualysis 800PA measure?
It quantifies phenolphthalein alkalinity (P-alkalinity) exclusively, reported in customizable units: °dH, °f, ppm CaCO₃, or mmol/L.
Can it be integrated into an existing PLC-based control system?
Yes—via RS485 (Modbus RTU) or discrete relay/digital I/O signals, enabling seamless coordination with dosing pumps, flow meters, or supervisory controllers.
Is manual calibration required during routine operation?
No—automatic single-point calibration is performed before each analysis cycle using factory-predefined reagent concentrations and optical reference values.
What is the typical analysis cycle time?
2–8 minutes, dependent on sample alkalinity concentration and selected measurement range.
Does the analyzer support multi-channel expansion?
Yes—when paired with the GreenPrima MCS series multiplexer module, up to eight independent sample streams can be monitored sequentially without interrupting ongoing measurements.