Tianhong TH-ZX100 Permanganate Index Analyzer

Overview

The Tianhong TH-ZX100 Permanganate Index Analyzer is a fully automated benchtop instrument engineered for precise, compliant determination of the permanganate index (also known as COD_Mn) in surface water, drinking water sources, and treated effluents. It implements the standardized potassium permanganate oxidation method—based on redox titration under acidic or neutral conditions—where the endpoint is objectively determined via real-time monitoring of oxidation-reduction potential (ORP) using dual-platinum electrodes. This electrochemical detection approach eliminates subjective visual endpoint interpretation, significantly improving measurement objectivity and inter-laboratory reproducibility. Designed to meet the stringent procedural requirements of GB 11892–1989, HJ/T 100–2003, and Q/WWST01–2014, the TH-ZX100 delivers traceable, auditable results suitable for regulatory reporting, environmental monitoring programs, and routine water quality surveillance.

Key Features

• ORP-based endpoint detection using high-stability dual-platinum electrodes, minimizing interference from turbidity, color, or suspended solids
• Oil-bath heating system maintaining precise reaction temperature at 97–99 °C, with independent dual-sensor monitoring of both oil bath and reaction chamber temperatures
• 100 mL sample volume delivery—strictly aligned with national standard methodology—to ensure stoichiometric consistency and comparability with reference manual methods
• Dual-stage reagent dosing: 10 mL calibrated glass burette combined with peristaltic pump auto-calibration, compensating for tubing deformation over time and ensuring long-term volumetric accuracy
• Integrated self-validation protocols including manual and remote-triggered instrument self-checks and spike recovery verification, supporting GLP-compliant operational qualification
• Real-time telemetry of critical process parameters—including ORP value, heating temperature, pump status, and fault codes—enabling remote diagnostics and predictive maintenance
• Automated sample tube rinsing between analyses and programmable reverse-flush cleaning cycle to prevent carryover and cross-contamination
• External water reservoir design reduces dependency on stable municipal water pressure, enabling reliable operation in field-deployed or low-infrastructure monitoring stations

Sample Compatibility & Compliance

The TH-ZX100 is validated for use with raw and treated freshwater matrices, including rivers, lakes, reservoirs, and potable water distribution systems. It accommodates samples with moderate turbidity (<50 NTU) and low-to-moderate organic load without pre-filtration. All operational sequences—including reagent addition, heating duration, titration kinetics, and endpoint logic—conform to the procedural constraints defined in GB 11892–1989. Instrument performance verification data—including repeatability, accuracy, and limit of detection—have been certified by the Hubei Provincial Electronic Information Product Quality Supervision and Inspection Institute. While not inherently compliant with ISO/IEC 17025 accreditation requirements, the system supports audit-ready data logging and metadata tagging necessary for laboratory accreditation preparation.

Software & Data Management

The analyzer operates via an embedded Linux-based control system with a 7-inch capacitive touchscreen interface featuring full Chinese language support and intuitive icon-driven navigation. All measurement data—including raw ORP curves, temperature logs, reagent consumption records, and validation reports—are timestamped and stored locally on internal flash memory (≥16 GB). Data export is supported via USB 2.0 and optional RS-485/Modbus RTU or Ethernet TCP/IP interfaces for integration into SCADA or LIMS platforms. Audit trails record all user actions (e.g., calibration, validation, parameter changes), satisfying basic requirements for traceability under GLP frameworks. Remote firmware updates and configuration management are enabled through secure SSH access.

Applications

• Regulatory compliance monitoring for municipal water utilities and environmental protection agencies
• Trend analysis of organic pollution levels in watershed management programs
• Performance evaluation of drinking water treatment processes (e.g., coagulation, filtration, disinfection)
• Baseline characterization of source waters prior to treatment plant design or upgrade
• Field-deployable verification of laboratory-performed permanganate index measurements
• Quality assurance for laboratories participating in inter-laboratory comparison studies

FAQ

What standards does the TH-ZX100 comply with?

It meets GB 11892–1989, HJ/T 100–2003, and Q/WWST01–2014, with test reports issued by the Hubei Provincial Electronic Information Product Quality Supervision and Inspection Institute.
Can the instrument be integrated into an existing SCADA system?

Yes—via Modbus RTU (RS-485) or TCP/IP (Ethernet), supporting real-time status polling and alarm forwarding.
How often is calibration required?

The KMnO₄ vs. Na₂C₂O₄ titer coefficient must be verified every 15 days; the system retains historical coefficient values and flags deviations exceeding ±5%.
Is distilled water mandatory for rinsing?

No—deionized or tap water may be used; the external reservoir design accommodates variable inlet pressure (0.05–0.3 MPa).
Does the system support 21 CFR Part 11 compliance?

Not natively—electronic signatures, role-based access control, and electronic audit trail encryption require third-party LIMS-level implementation.