GreenPrima PM8200CL Online Residual Chlorine Analyzer

Overview

The GreenPrima PM8200CL Online Residual Chlorine Analyzer is an industrial-grade, continuous-monitoring instrument engineered for real-time quantification of free and total chlorine in aqueous systems using amperometric electrochemical detection. Based on the constant-voltage (galvanostatic) principle, the analyzer operates with the GreenPrima BSens650 chlorine-specific sensor—designed to deliver stable, drift-resistant current response proportional to dissolved chlorine concentration. The system integrates temperature compensation via a built-in Pt1000 resistance thermometer, supporting both automatic and user-adjustable offset correction (±10.0 °C). Its robust architecture enables deployment in demanding environments including wastewater treatment plants, municipal drinking water distribution networks, industrial cooling towers, and pharmaceutical process water loops—where regulatory compliance, long-term reliability, and minimal maintenance are critical operational requirements.

Key Features

• Amperometric measurement with GreenPrima BSens650 constant-voltage chlorine electrode—optimized for low-drift performance and rapid response in variable pH and oxidant backgrounds
• Dual-range measurement capability: 0.00–2.000 ppm (high-resolution mode) and 0.00–20.00 ppm (extended-range mode), selectable via front-panel interface
• True automatic temperature compensation using integrated Pt1000 sensor; manual offset adjustment available for calibration traceability under non-standard thermal conditions
• IP65-rated sealed enclosure with corrosion-resistant front panel—suitable for outdoor mounting and high-humidity industrial settings without additional enclosures
• Backlit monochrome LCD display (44 × 65 mm) showing real-time chlorine concentration, measured temperature, relay status, and diagnostic indicators
• Two fully configurable 4–20 mA analog outputs—each independently assignable to chlorine value, temperature, or alarm status with scalable engineering units
• Two programmable SPDT relays with user-defined high/low setpoints, adjustable hysteresis, and fail-safe logic—certified for control interlocking per IEC 61508 SIL 1 applications
• Wide-input AC power supply (90–260 VAC, 50/60 Hz) with internal surge suppression and EMI filtering—compliant with EN 61326-1 for electromagnetic compatibility in industrial plants
• Password-protected configuration menu with three-tier access levels (operator, technician, administrator) to ensure data integrity and audit readiness

Sample Compatibility & Compliance

The PM8200CL is validated for use in potable water, secondary-treated wastewater, chlorinated process water, and recirculated cooling water with turbidity ≤ 10 NTU and suspended solids < 50 mg/L. It complies with ISO 7393-2 for electrochemical residual chlorine determination and supports alignment with US EPA Method 334.0 and ASTM D1253 for field-deployable chlorine monitoring. When deployed in GMP-regulated facilities (e.g., pharmaceutical water systems), its relay and analog outputs support integration into SCADA or DCS architectures compliant with FDA 21 CFR Part 11 when paired with validated data logging software. The device meets CE marking requirements under the Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU), and its sensor housing conforms to NSF/ANSI Standard 61 for contact with drinking water.

Software & Data Management

While the PM8200CL operates as a standalone controller with no embedded firmware-based data storage, its dual 4–20 mA outputs enable seamless connection to centralized PLCs, DCS systems, or third-party historian platforms (e.g., Siemens Desigo, Honeywell Experion, or Ignition SCADA). All configuration parameters—including range selection, relay thresholds, temperature offset, and output scaling—are retained in non-volatile memory and survive power interruption. Configuration changes are logged internally with timestamp and user ID (when password-authenticated), providing basic audit trail functionality. For extended data archiving, GreenPrima recommends integration with certified industrial data acquisition systems that support Modbus RTU (via optional RS485 module) or HART protocol—both compatible with standard calibration and diagnostic routines defined in IEC 61804.

Applications

• Municipal drinking water disinfection control—continuous verification of chlorine residual at entry points, storage reservoirs, and zone pressure valves
• Wastewater effluent monitoring—ensuring regulatory compliance with discharge permits (e.g., EPA NPDES limits) prior to environmental release
• Food & beverage processing—chlorine validation in CIP rinse cycles and final product water lines per SQF and BRCGS standards
• Pharmaceutical purified water (PW) and water-for-injection (WFI) distribution loops—supporting periodic verification per USP and EU Annex 1
• Industrial cooling water systems—optimizing biocide dosing while minimizing corrosion risk and regulatory reporting burden
• Swimming pool and spa management—automated feedback control of sodium hypochlorite or chlorine gas dosing systems

FAQ

What measurement principle does the PM8200CL employ?
It uses amperometric detection based on constant-voltage electrolysis at the BSens650 chlorine-selective electrode surface.
Is temperature compensation mandatory for accurate readings?
Yes—temperature significantly affects chlorine diffusion kinetics and electrode sensitivity; automatic compensation using the integrated Pt1000 sensor is required for metrological validity.
Can the PM8200CL measure both free and total chlorine simultaneously?
No—it measures free chlorine by default; total chlorine requires acidification pretreatment upstream of the sensor and is not supported natively by this model.
What is the recommended calibration frequency under continuous operation?
Daily zero calibration with dechlorinated water and weekly span calibration using NIST-traceable chlorine standard solution (e.g., 1.00 ppm Cl₂) are recommended per ISO 7393-2.
Does the device support digital communication protocols beyond analog outputs?
Standard configuration includes only 4–20 mA and relay outputs; RS485 Modbus RTU is available as an optional field-installable module.
Is the BSens650 sensor compatible with seawater or high-salinity brines?
No—the sensor is designed for freshwater applications; chloride interference above 500 mg/L may compromise accuracy and accelerate membrane fouling.