HACH QL3580i Online Total Organic Carbon Analyzer

Overview

The HACH QL3580i Online Total Organic Carbon Analyzer is an industrial-grade, continuous-monitoring instrument engineered for precise, real-time quantification of total organic carbon (TOC) and total inorganic carbon (TIC) in ultrapure water streams—particularly steam condensate, boiler feedwater, and pharmaceutical process water. It employs a dual-stage, sequential oxidation and NDIR detection methodology: first, acidification liberates inorganic carbon as CO₂, which is purged and measured as TIC; second, the residual sample undergoes UV/persulfate oxidation to convert non-volatile organic carbon into CO₂, followed by quantitative NDIR detection to determine TOC. This two-step, reagent-free acidification pathway eliminates interference from atmospheric CO₂ dissolution and avoids alkaline reagents entirely—enhancing measurement integrity, reducing operator burden, and supporting long-term stability in high-purity water applications where trace-level contamination must be rigorously controlled.

Key Features

• UV/persulfate oxidation system optimized for low-conductivity, low-TOC condensate streams—provides complete oxidation of recalcitrant organics without catalysts or high-temperature furnaces
• 4 mm internal diameter fluidic path with 2 mm particle tolerance—enables direct analysis of unfiltered industrial condensate, minimizing pre-treatment requirements and clogging risk
• Two-point automatic calibration with programmable schedule—reduces manual intervention while maintaining traceable accuracy per ISO 8245 and ASTM D5905
• Batch-mode measurement cycle—limits reagent consumption, extends service intervals, and improves operational cost efficiency over continuous-flow systems
• Reagent-free acidification step—eliminates sodium hydroxide or other alkaline reagents, removing a major source of CO₂ absorption artifacts and simplifying on-site chemical handling
• Compact footprint (W × D × H: 350 × 300 × 500 mm) with optional ATEX/IECEx-rated enclosure compatibility—supports flexible installation in confined spaces, hazardous areas, or integrated skid-mounted systems
• High-resolution capacitive touchscreen interface with multi-level user access control (operator, engineer, administrator)—supports audit-ready configuration logging and password-protected parameter modification

Sample Compatibility & Compliance

The QL3580i is validated for use with conductivity < 5 µS/cm samples, including turbine condensate, deionized water, and purified water per USP and EP 2.2.44. Its NDIR detector meets IEC 61508 SIL 2 functional safety requirements when deployed in safety-instrumented systems. The analyzer complies with data integrity expectations under FDA 21 CFR Part 11 through built-in electronic signature support, time-stamped audit trails, and immutable event logs. All calibration and maintenance records are exportable via USB or Modbus TCP, facilitating integration into LIMS and MES platforms compliant with ISO/IEC 17025 and GMP Annex 11.

Software & Data Management

Firmware includes embedded HACH Insight™ analytics engine, enabling real-time trend visualization, alarm threshold configuration (high/low, rate-of-change), and automated report generation (CSV/PDF). Data storage supports ≥30 days of second-by-second TOC/TIC values with metadata tagging (sample ID, calibration status, fault codes). Remote diagnostics and secure firmware updates are supported via TLS 1.2-encrypted Ethernet connection. Optional HACH DataSuite™ cloud gateway enables encrypted telemetry to enterprise SCADA or cloud-based asset monitoring platforms—with configurable retention policies and role-based dashboard access.

Applications

• Power generation: Continuous TOC monitoring of turbine condensate to detect early-stage heat exchanger leakage or resin degradation
• Pharmaceutical manufacturing: USP -compliant TOC verification of WFI (Water for Injection) and Purified Water distribution loops
• Microelectronics: Ultrapure water (UPW) quality assurance in semiconductor fab rinse lines and tool coolant circuits
• Chemical processing: Monitoring of steam-recovery systems where organic carryover may indicate upstream equipment fouling or seal failure
• Research facilities: Long-term stability studies of high-purity water systems requiring GLP-aligned data traceability

FAQ

What sample conductivity range is compatible with the QL3580i?

The analyzer is optimized for samples with conductivity ≤5 µS/cm. Conductivity >10 µS/cm may require dilution or alternate method validation.
Does the QL3580i meet USP requirements for TOC analysis?

Yes—when operated per HACH’s validated method package (including specified calibration standards, oxidant concentration, and system suitability tests), it satisfies USP performance criteria for accuracy, precision, and detection limit.
Can the instrument be integrated into a DCS or PLC environment?

Yes—via native Modbus TCP or optional 4–20 mA analog outputs with HART 7 protocol support; all communication interfaces comply with ISA-95 Level 2 interoperability standards.
Is routine maintenance limited to consumables only?

Yes—primary consumables are persulfate solution, acid reagent, and NDIR detector desiccant cartridges. No optical alignment, lamp replacement, or column regeneration is required during normal operation.
How is data integrity ensured for regulated environments?

Through hardware-enforced write-once audit logs, electronic signatures with biometric or token-based authentication, and timestamped calibration/maintenance entries—all retained locally and exportable in tamper-evident format per 21 CFR Part 11 Subpart B.