GreenPrima PM8200CL Dissolved Ozone Analyzer

Overview

The GreenPrima PM8200CL is a high-stability, online dissolved ozone (O₃) analyzer engineered for continuous, real-time monitoring in critical water treatment applications. It operates on the amperometric electrochemical principle—specifically, the constant-potential (galvanostatic) method—where a fixed voltage is applied between a gold-ring working electrode (Bsens660 sensor) and a reference electrode. Dissolved ozone undergoes selective electrochemical reduction at the polarized gold surface, generating a diffusion-controlled current proportional to its aqueous concentration. This signal is digitized, temperature-compensated, and converted into a calibrated ppm output. Unlike colorimetric or UV-absorption methods, the PM8200CL requires no reagents, optical path alignment, or consumable membranes—eliminating drift from fouling, photodegradation, or chemical interference. Its design meets the operational demands of municipal drinking water distribution systems, hospital wastewater disinfection loops, pharmaceutical process water lines, and recirculating swimming pool networks where regulatory compliance, measurement continuity, and long-term sensor stability are non-negotiable.

Key Features

• Gold-ring amperometric sensor (Bsens660) optimized for low-range ozone detection (0–2 ppm), delivering superior signal-to-noise ratio and minimal polarization lag
• Integrated BAF615 constant-flow cell ensuring laminar, pressure-independent sample delivery—critical for reproducible mass transport to the electrode surface
• No membrane replacement, no electrolyte refilling, and no chemical reagents required—reducing total cost of ownership and maintenance frequency
• Auto-zero stabilization algorithm compensates for baseline drift without manual calibration; validated zero stability over 72-hour unattended operation
• Dual 4–20 mA analog outputs support independent transmission of ozone concentration and temperature data to DCS/SCADA systems with 0.1% FS linearity
• Configurable cleaning cycle via relay output—enabling automated mechanical or chemical cleaning synchronized with process downtime
• IP65-rated controller housing suitable for indoor and semi-outdoor installation environments, including pump stations and chlorination rooms

Sample Compatibility & Compliance

The PM8200CL is validated for use with potable water, filtered surface water, tertiary-treated effluent, and low-conductivity purified water (≥50 µS/cm). It maintains accuracy across pH 4.0–9.5 and turbidity up to 10 NTU without filtration. While not certified to ISO 15839 or EN 14897 as a standalone device, its sensor architecture conforms to the functional requirements outlined in those standards for electrochemical residual oxidant analyzers. When deployed in GMP-regulated pharmaceutical water systems, the instrument supports audit-ready data integrity through timestamped internal logging (600,000 records), user-accessible configuration history, and optional 21 CFR Part 11-compliant software modules (via external PC interface). Calibration traceability follows NIST-traceable ozone gas standards (e.g., O₃-in-N₂ certified mixtures) per ASTM D6508 practice.

Software & Data Management

The embedded firmware provides local configuration via intuitive menu navigation on the backlit graphic LCD. All parameters—including range selection, temperature compensation mode (manual/automatic), analog output scaling, cleaning schedule, and alarm thresholds—are stored non-volatily. Data export is supported via RS485 Modbus RTU protocol (addressable slave ID, baud rate up to 115.2 kbps), enabling seamless integration into industrial automation platforms. Raw sensor current, compensated concentration, temperature, and diagnostic flags (e.g., flow fault, electrode aging index) are accessible in real time. Internal memory logs measurements at user-defined intervals (1 sec to 1 hour), with automatic overwrite upon capacity exhaustion. No proprietary software is required for basic operation; however, GreenPrima’s optional DataLink Suite (Windows-based) enables trend visualization, report generation (PDF/CSV), and remote firmware updates.

Applications

• Municipal drinking water treatment plants: Monitoring post-ozone contact tank residuals to verify CT value compliance per US EPA Guidance Manual and WHO Guidelines for Drinking-water Quality
• Hospital central sterile supply departments (CSSD): Ensuring consistent ozone dosing in instrument washer-disinfectors and endoscope reprocessing units
• Pharmaceutical purified water (PW) and water-for-injection (WFI) distribution loops: Supporting Annex 1 and EU GMP Chapter 5 validation requirements for continuous microbial control
• Commercial swimming pool and spa facilities: Maintaining safe, non-irritating disinfectant levels while minimizing bromate formation risk
• Food & beverage processing: Verifying ozone efficacy in CIP rinse cycles and bottle/can sterilization tunnels

FAQ

Does the PM8200CL measure free chlorine or only dissolved ozone?
The PM8200CL is specifically configured and calibrated for dissolved ozone (O₃). It does not cross-react with free chlorine (HOCl/OCl⁻) under normal operating conditions due to the selective catalytic reduction potential of the gold-ring electrode.
Can the sensor be installed directly in a pipe without a flow cell?
No. The Bsens660 electrode must be used with the BAF615 constant-flow cell to maintain laminar flow velocity (~0.3–1.0 m/s) and prevent boundary layer instability that would compromise amperometric response linearity.
Is temperature compensation mandatory for accurate readings?
Yes. Ozone solubility and electrode kinetics are strongly temperature-dependent. The PM8200CL includes a built-in Pt1000 RTD and applies automatic compensation across –10 to 130 °C using the IUPAC-specified Henry’s law coefficient database.
How often does the sensor require calibration verification?
GreenPrima recommends quarterly verification using a portable ozone photometer (e.g., Hach DR3900 with ozone method 10016) or certified ozone gas standard; full recalibration is typically needed only after electrode replacement or exposure to extreme pH or oxidant shock.
What is the expected service life of the Bsens660 electrode?
Under typical municipal water conditions (pH 7.2 ± 0.5, <1 NTU, 15–25 °C), the gold-ring electrode demonstrates ≥24 months of stable performance before sensitivity decay exceeds 5% of initial slope—verified via factory-issued longevity test reports.