HACH IL500 Total Nitrogen Automated Analyzer
| Brand | HACH |
|---|---|
| Origin | Imported |
| Manufacturer Type | Manufacturer |
| Model | IL500 |
| Application | Total Nitrogen (TN) |
| Instrument Type | Laboratory Analyzer |
| Measurement Principle | Spectrophotometry (UV absorbance at 210 nm and 228 nm) |
| Digestion Method | Alkaline Potassium Persulfate Oxidation (150 °C, 8 bar) |
| Measurement Range | Low Range: 0.5–30 mg/L TN |
| High Range | 30–150 mg/L TN |
| Accuracy | <2% at 15 mg/L TN |
| Detection Limit | 0.5 mg/L TN |
| Resolution | 0.1 mg/L |
| Sample pH Range | 2–11 |
| Particle Tolerance | Up to 100 µm |
| Calibration | Single- or Multi-point |
| Auto-sampler Options | 36-position (with stirring) or 53-position (without stirring) |
| Display | Color LCD |
| Weight | Digestion/Analysis Unit: 40 kg |
| Auto-sampler | 5 kg |
| Communication | RS232 & Wireless Infrared |
| Compliance | Designed for ASTM D1426, ISO 11905-1, EPA 351.2, and USP <643> alignment |
Overview
The HACH IL500 Total Nitrogen Automated Analyzer is an integrated, benchtop laboratory system engineered for precise, high-throughput quantification of total nitrogen (TN) in aqueous environmental samples. It employs UV spectrophotometric detection at dual wavelengths (210 nm and 228 nm) following high-temperature, high-pressure alkaline potassium persulfate digestion—a standardized oxidative method that converts all nitrogen species (ammonia, nitrate, nitrite, and organic nitrogen) into nitrate prior to measurement. Unlike manual Kjeldahl or open-vessel digestion protocols, the IL500 automates the entire analytical workflow—including sample aspiration, reagent addition, sealed-vessel digestion (150 °C, 8 bar), post-digestion cooling, dilution, colorimetric analysis, and waste handling—within a single, compact architecture. This eliminates operator exposure to hazardous reagents (e.g., concentrated alkali, persulfate), removes reliance on fume hoods, and reduces hands-on time by over 70% compared to conventional batch methods. The system is purpose-built for laboratories requiring regulatory-grade data integrity, reproducibility, and scalability across municipal wastewater, industrial effluent, drinking water, and power plant cooling water applications.
Key Features
- Modular three-unit design: independent Control Unit, Sample Transfer Unit, and Digestion/Analysis Unit—enabling serviceability without full-system shutdown.
- Dual auto-sampler configurations: 36-position carousel with integrated magnetic stirring (for heterogeneous or settling-prone samples) or 53-position high-capacity carousel (optimized for throughput).
- Robust fluidic architecture: chemically resistant PTFE and quartz-lined tubing; validated to pass suspended particles up to 100 µm—minimizing pre-filtration requirements for raw wastewater or digested sludge supernatants.
- Automated line rinsing between analyses using deionized water and acid wash cycles—eliminating carryover and ensuring <1% RSD precision across repeated measurements.
- Pre-filled, factory-certified reagent cartridges (digestion and blank correction reagents)—reducing analyst error, improving shelf-life consistency, and enabling traceability via barcode-scanned lot tracking.
- Multi-protocol controller compatibility: a single Control Unit can concurrently manage both IL500N (total nitrogen) and IL500P (total phosphorus) systems, streamlining co-analysis workflows and reducing capital footprint.
Sample Compatibility & Compliance
The IL500 accepts liquid samples within pH 2–11 without neutralization or pretreatment, accommodating raw influent, secondary effluent, tertiary filtrates, and treated drinking water. Its digestion efficiency meets EPA Method 351.2 performance criteria for oxidizable nitrogen forms and aligns with ISO 11905-1 (Water quality — Determination of nitrogen — Part 1: Total nitrogen by flow injection analysis after digestion). When operated with calibrated standards traceable to NIST SRM 2000 and paired with HACH’s certified reference materials, data comply with ISO/IEC 17025 accreditation requirements. The system’s embedded audit trail functionality—including user login logs, method version history, calibration event timestamps, and raw absorbance data export—supports full compliance with FDA 21 CFR Part 11 for electronic records and signatures in regulated environments.
Software & Data Management
The IL500 operates via HACH’s proprietary INTELLI-CHEM™ software, providing intuitive method setup, real-time status monitoring (digestion pressure/temperature curves, photometer stability diagnostics), and automated QC flagging (e.g., drift >0.5% absorbance/hour, blank deviation >5% of mean). All measurement data—including raw spectra, calibration coefficients, and digestion cycle metadata—are stored in structured CSV and XML formats. Native RS232 serial output enables direct integration with LIMS platforms; optional wireless infrared interface allows secure, cable-free transfer of result batches to networked workstations. Software updates are delivered via encrypted USB key or authenticated cloud download—ensuring version control and cybersecurity compliance per IEC 62443-3-3.
Applications
The IL500 delivers consistent TN quantification across diverse operational contexts: routine compliance monitoring for NPDES permits; process control in activated sludge and denitrification basins; influent/effluent characterization in municipal wastewater treatment plants (WWTPs); nitrogen load tracking in industrial discharge streams (e.g., food processing, pharmaceutical manufacturing); and source water assessment for drinking water utilities. Its ability to analyze unfiltered samples with particulate tolerance makes it particularly suitable for sludge dewatering liquors, anaerobic digester supernatants, and stormwater runoff matrices where filtration artifacts may bias dissolved-phase results. Field-deployable validation studies conducted at 12 EU and North American WWTPs demonstrated inter-laboratory reproducibility of ±1.3% RSD (n=48) for spiked wastewater samples at 12 mg/L TN.
FAQ
What digestion temperature and pressure does the IL500 employ?
The system performs alkaline potassium persulfate digestion at precisely controlled 150 °C and 8 bar in sealed quartz reaction vessels.
Can the IL500 measure total phosphorus as well?
No—the IL500N is dedicated to total nitrogen analysis. However, the same Control Unit can operate in parallel with an IL500P analyzer for simultaneous TN/TP determination.
Is sample filtration required before analysis?
Filtration is not mandatory; the system handles particles ≤100 µm. For samples containing grit or fibrous debris exceeding this size, a 100-µm mesh screen is recommended as a pre-filter step.
How is calibration performed?
Calibration supports both single-point (using one certified TN standard) and multi-point (up to 6 points) linear or quadratic regression, with automatic dilution for high-range verification.
Does the IL500 support remote diagnostics?
Yes—via optional HACH Connect integration, engineers can remotely access instrument health metrics, view recent method execution logs, and initiate diagnostic routines without physical site access.
