GreenPrima PM 8202C Online Conductivity Analyzer

Overview

The GreenPrima PM 8202C Online Conductivity Analyzer is a high-stability industrial process instrument engineered for continuous, real-time measurement of electrical conductivity, salinity, and total dissolved solids (TDS) in aqueous solutions. Based on the fundamental principle of two-electrode or four-electrode conductometric measurement—where conductivity is derived from the solution’s ability to carry electrical current under a known applied voltage—the PM 8202C delivers consistent performance across demanding environments including potable water treatment, wastewater effluent monitoring, chemical dosing control, boiler feedwater management, and pharmaceutical process water systems. Its dual-range capability (spanning from ultra-pure water at 0.01 µS/cm up to concentrated brines at 2000 mS/cm) ensures adaptability without manual range switching, while integrated temperature compensation (via NTC30k or PT1000 inputs) maintains measurement integrity across thermal gradients from −10 °C to +70 °C.

Key Features

• Triple-parameter simultaneous output: Conductivity (0.00–2000 mS/cm), salinity (0.00–78.00 ppt), and TDS (0–120,000 ppm), all traceably calculated per ISO 7888 and ASTM D1125 standards.
• Dual isolated 4–20 mA analog outputs configurable for primary parameter + temperature or dual parameters with independent zero/span calibration.
• RS485 Modbus RTU communication interface (with optional HART 7.5 protocol support) enables seamless integration into DCS, SCADA, and PLC-based control architectures.
• IP65-rated rugged enclosure with corrosion-resistant front panel, suitable for wall-mount, pipe-mount, or panel-mount installation in humid, dusty, or splash-prone industrial zones.
• Backlit dot-matrix LCD display with intuitive bilingual (English/Chinese) menu navigation and password-protected configuration access to prevent unauthorized parameter changes.
• Configurable cleaning cycle control output with adjustable timing (0.1–1000 h interval; 1–1000 s duration) to synchronize with automated electrode cleaning systems.
• Two programmable relay outputs supporting high/low alarm logic with user-defined hysteresis, rated for 5 A resistive load at 250 VAC or 30 VDC.

Sample Compatibility & Compliance

The PM 8202C is compatible with a wide range of industrial aqueous media—including municipal drinking water, reverse osmosis permeate, cooling tower blowdown, electroplating baths, and clean-in-place (CIP) rinse solutions—provided that conductivity remains within its specified operational envelope and no solid particulates exceed 50 µm in diameter. Electrode selection (e.g., graphite, stainless steel, or titanium) must be matched to chemical compatibility requirements and fouling propensity. The analyzer complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions), meets CE marking requirements for electromagnetic compatibility and low-voltage directive, and supports audit-ready operation under GLP and GMP frameworks through time-stamped data logging (600,000 records) and non-volatile parameter storage.

Software & Data Management

Data acquisition and configuration are managed via embedded firmware supporting Modbus register mapping for third-party SCADA integration. Logged measurements include conductivity, temperature, salinity, TDS, and system status flags—all timestamped with millisecond resolution. Local configuration is performed directly on-device using the tactile keypad and LCD interface; remote commissioning and diagnostics are enabled via Modbus commands or optional PC-based configuration utility (Windows-compatible, USB-to-RS485 adapter required). All critical configuration changes are recorded in an internal event log, supporting FDA 21 CFR Part 11 compliance when deployed with external electronic record systems implementing appropriate access controls and audit trails.

Applications

• Continuous monitoring of conductivity in ultrapure water loops for semiconductor fab facilities (ASTM D5127).
• Real-time salinity control in desalination plant intake and product water streams.
• TDS trending in food & beverage CIP validation cycles to verify detergent removal.
• Boiler blowdown control based on conductivity thresholds to optimize energy and water use.
• Wastewater treatment plant influent/effluent compliance reporting per local discharge permits (e.g., EPA 122.1, EU Urban Wastewater Directive Annex I).
• Pharmaceutical purified water (PW) and water-for-injection (WFI) system surveillance per USP and Ph. Eur. 2.2.38.

FAQ

What temperature compensation methods does the PM 8202C support?
It supports both automatic and manual temperature compensation using either NTC30k thermistors or PT1000 RTD sensors, with compensation algorithms conforming to the DIN EN 27888 standard.
Can the device operate on 24 VDC power?
Yes—while the standard configuration uses 90–260 VAC, a 24 VDC power option is available upon request and configured during manufacturing.
Is the data logger accessible externally?
The internal 600,000-record buffer is readable only via Modbus register polling or local display export; no removable memory card or USB host interface is provided.
How is calibration verified in-situ?
Calibration verification is performed using certified standard solutions (e.g., KCl 0.01 mol/kg, 0.1 mol/kg) and confirmed by comparing measured values against NIST-traceable reference data stored in the device’s calibration history log.
Does the unit support redundant sensor inputs?
No—the PM 8202C accepts a single conductivity sensor input and one dedicated temperature sensor input; dual-sensor redundancy requires external multiplexer integration at the system level.