GreenPrima PM8200C Online Conductivity & TDS Analyzer

Overview

The GreenPrima PM8200C Online Conductivity & TDS Analyzer is an industrial-grade, microprocessor-based process analyzer engineered for continuous, high-reliability measurement of electrical conductivity, total dissolved solids (TDS), salinity, resistivity, and temperature in aqueous streams. Based on the fundamental principle of conductometric measurement—where conductivity is derived from the electrical current flow between two or four electrodes immersed in solution—the PM8200C delivers stable, temperature-compensated readings across a wide dynamic range (0.00–2000 mS/cm). Its modular architecture integrates seamlessly with GreenPrima’s family of BSens-series conductivity sensors (Bsens310 to Bsens350), each calibrated to a specific cell constant (K = 0.01 to K = 10) and constructed from chemically resistant materials—including 316L stainless steel, titanium, and graphite—to ensure long-term stability in aggressive or ultra-pure environments. Designed for deployment in demanding industrial settings, the analyzer operates under ambient temperatures from –10 °C to +70 °C and meets IP65 ingress protection standards for front-panel durability.

Key Features

• Modular sensor compatibility: Supports five interchangeable BSens probes (Bsens310–Bsens350) with selectable cell constants to optimize resolution and linearity across low-conductivity (e.g., ultrapure water) and high-conductivity (e.g., brine, chemical process streams) applications.
• Dual isolated 4–20 mA analog outputs: Configurable for simultaneous transmission of primary measurement (e.g., conductivity) and secondary parameter (e.g., temperature), each with 0.1% full-scale accuracy and galvanic isolation up to 1500 V_AC.
• RS485 Modbus RTU communication interface: Enables integration into distributed control systems (DCS), SCADA platforms, or PLC networks; HART protocol support available as factory option for legacy system compatibility.
• Intelligent cleaning control: Programmable cleaning output triggers external solenoid valves or ultrasonic cleaners at user-defined intervals (0.1–1000 hours) and durations (1–1000 seconds), minimizing fouling-induced drift in cooling towers, wastewater effluents, or seawater desalination pre-treatment lines.
• Two programmable relay outputs: Independent high/low alarm functions with adjustable hysteresis, rated for 5 A at 250 V_AC, suitable for pump interlocks, valve actuation, or audible/visual warning circuits.
• Secure configuration management: Dual-level password protection (calibration access code: 1100; setup mode code: 1200) prevents unauthorized parameter changes; one-button factory reset restores default calibration and system settings.

Sample Compatibility & Compliance

The PM8200C is validated for continuous monitoring of liquid-phase samples in municipal, pharmaceutical, power generation, food & beverage, and chemical manufacturing processes. It supports compliance-critical applications requiring adherence to ASTM D1125 (Standard Test Methods for Electrical Conductivity and Resistivity of Water), ISO 7888 (Water quality — Determination of electrical conductivity), and USP (Electrical Conductivity of Purified Water and Water for Injection). When deployed with appropriate sensor configurations and documented calibration procedures—including traceable NIST-traceable standard solutions—the system satisfies GLP and GMP data integrity requirements. Optional HART output and audit-trail-capable firmware upgrades facilitate alignment with FDA 21 CFR Part 11 electronic record and signature provisions where required.

Software & Data Management

While the PM8200C operates as a standalone field instrument with local LCD readout and menu navigation, its RS485 Modbus RTU interface enables bidirectional data exchange with supervisory software platforms such as Ignition SCADA, Siemens Desigo CC, or custom LabVIEW- or Python-based dashboards. All configuration parameters—including temperature compensation algorithm (linear or non-linear NTU/PT1000), TDS conversion factor (user-selectable 0.4–1.0), salinity calculation method (PSS-78), and relay logic thresholds—are stored in non-volatile memory and retain settings during power loss. Event logs—including calibration timestamps, alarm activations, and cleaning cycles—are retained onboard and retrievable via serial query. Firmware updates are performed via USB-to-RS485 adapter using GreenPrima’s certified configuration utility, ensuring version-controlled maintenance and cybersecurity hardening per IEC 62443-3-3 guidelines.

Applications

• Drinking water treatment: Real-time monitoring of source water conductivity to detect contamination events and optimize coagulant dosing.
• Pharmaceutical water systems: Continuous verification of conductivity in purified water (PW) and water for injection (WFI) loops per EU GMP Annex 1 and USP .
• Power plant condensate polishing: Detection of ion leakage from mixed-bed demineralizers through sub-µS/cm-level measurements using Bsens310 (K=0.01).
• Industrial cooling water management: Automated blowdown control based on TDS accumulation trends to minimize water and chemical consumption.
• Wastewater discharge compliance: Regulatory reporting of salinity and TDS in effluent streams prior to environmental release.
• Chemical dosing feedback control: Closed-loop adjustment of antiscalant or pH correction agents using conductivity-derived concentration feedback.

FAQ

What sensor cell constants are supported?
The PM8200C is compatible with Bsens310 (K=0.01), Bsens320 (K=0.1), Bsens330 (K=1), Bsens340 (K=0.5), and Bsens350 (K=10) sensors—each optimized for specific conductivity ranges and media chemistries.

Is temperature compensation automatic or manual?
Both modes are supported. Automatic compensation uses integrated NTC30k or PT1000 sensors (selected during setup); manual compensation allows fixed offset entry when reference temperature is known and stable.

Can the device operate on 24 VDC?
Yes—24 VDC power input is available as an optional configuration, enabling use in explosion-proof enclosures or battery-backed remote installations.

How is calibration traceability maintained?
Calibration is performed using certified standard solutions (e.g., KCl 1413 µS/cm, 12.88 mS/cm); all calibration events—including date, operator ID, standard used, and deviation—can be logged and exported via Modbus for audit purposes.

What mounting options are available?
The PM8200C supports wall-mount, panel-mount (138 × 138 mm cutout), and pipe-mount configurations; sensor bodies are rated IP68 and designed for direct insertion or retractable fitting installation.