Hach IL550 Used Total Organic Carbon (TOC) Analyzer

Overview

The Hach IL550 is a high-performance, laboratory-grade Total Organic Carbon (TOC) analyzer engineered for precise quantification of organic carbon content in aqueous samples across environmental, municipal, and industrial water quality applications. It operates on the principle of direct conductivity detection following UV/persulfate oxidation—a robust, low-maintenance alternative to high-temperature combustion methods. In this process, organic carbon compounds are oxidized to CO₂ under ultraviolet irradiation (185 nm and 254 nm wavelengths) in the presence of acidified persulfate, and the resulting CO₂ is measured via changes in solution conductivity. This method eliminates the need for gas calibration standards or carrier gases, reduces consumables, and ensures stable baseline performance over extended operation cycles. The IL550 is designed for regulatory-compliant analysis of drinking water, wastewater effluents, process water, cooling tower systems, and natural surface waters—supporting routine monitoring as well as method validation per EPA Method 415.3 and ISO 8245.

Key Features

• UV/persulfate oxidation system with dual-wavelength UV lamps (185 nm for radical generation and 254 nm for photolysis enhancement), enabling efficient oxidation of recalcitrant organics without catalysts or high-temperature furnaces
• Direct conductivity detection module with temperature-compensated electronics, delivering high signal stability and minimal drift between calibrations
• Automated three-dimensional sample introduction system that optimizes aspiration, injection, and rinse cycles—reducing cycle time by up to 40% compared to conventional flow-through designs
• Integrated software-controlled reagent delivery and acidification, ensuring consistent pH adjustment prior to oxidation for accurate TIC removal and NPOC determination
• Configurable measurement modes: TC, TIC, TOC (by difference), and NPOC (non-purgeable organic carbon), each traceable to NIST-traceable potassium hydrogen phthalate (KHP) and sodium bicarbonate standards
• Robust architecture compliant with IP20 enclosure rating; designed for continuous operation in controlled laboratory environments (10–35 °C, ≤90% RH)

Sample Compatibility & Compliance

The IL550 accommodates liquid samples ranging from ultra-pure water (e.g., pharmaceutical PW/WFI) to highly saline or turbid matrices—including treated wastewater and industrial process streams—without mandatory dilution in most cases. Sample volume flexibility (0.5–20 mL) supports both low-concentration environmental monitoring and high-level industrial compliance testing. For solid or semi-solid samples, optional integration with the HSC1300 high-temperature solids combustion module (up to 1300 °C) enables TOC quantification in soils, sludges, and filter media—though such configurations require separate hardware validation. The analyzer meets design and performance criteria aligned with ASTM D5907, USP , and EP 2.2.44 for TOC instrumentation. Its audit trail, user access control, and electronic signature capabilities support GLP and GMP environments when operated with validated software protocols.

Software & Data Management

Controlled via Hach’s proprietary TOC Expert software (v4.x or later), the IL550 provides real-time graphical display of conductivity response curves, peak integration, and calibration verification reports. All analytical events—including method execution, calibration history, maintenance logs, and user actions—are timestamped and stored locally with configurable export options (CSV, PDF, XML). The RS232 serial interface enables bidirectional communication with LIMS platforms and supports 21 CFR Part 11-compliant data integrity features when deployed with appropriate IT infrastructure and procedural controls. Raw data files retain full metadata (sample ID, operator, date/time, method parameters, instrument status flags), facilitating retrospective review during internal audits or regulatory inspections.

Applications

• Regulatory compliance monitoring for drinking water utilities under the U.S. EPA Stage 2 Disinfectants and Disinfection Byproducts Rule (Stage 2 DBPR)
• Pharmaceutical water system qualification (PW, WFI, pure steam condensate) per USP and EU Annex 1 requirements
• Industrial pretreatment and discharge reporting for chemical, semiconductor, and food & beverage facilities
• Research and development of advanced oxidation processes (AOPs), membrane fouling studies, and biodegradability assessments
• Environmental site assessment of groundwater plumes and sediment pore water
• Validation of carbon removal efficiency in activated carbon filters and UV-AOP reactors

FAQ

Does the IL550 require daily calibration?
No—calibration frequency is method- and application-dependent; typical intervals range from once per 8-hour shift to once per day, supported by automated bracketing standards and system suitability checks.
Can the IL550 measure TOC in seawater or brine samples?
Yes, with appropriate matrix-matched calibration and optional conductivity compensation algorithms; however, chloride interference above 10,000 mg/L may necessitate dilution or method modification.
Is the UV/persulfate oxidation method suitable for chlorinated samples?
Yes—the method tolerates residual chlorine up to 2 mg/L; higher concentrations should be quenched with sodium thiosulfate prior to analysis.
What is the typical service life of the UV lamps?
Lamp lifetime is rated at ≥10,000 hours under normal operating conditions; output degradation is monitored automatically and reported in the diagnostics log.
Does the used unit include original factory documentation and calibration records?
All certified pre-owned IL550 units undergo functional verification, lamp replacement (if required), and full recalibration prior to shipment; complete OEM manuals, certificate of conformance, and post-service calibration report are provided.