MLE FIACompact Flow Injection Analyzer

Overview

The MLE FIACompact Flow Injection Analyzer is a laboratory-grade photometric flow injection system engineered for high-precision, automated determination of inorganic and organic analytes in environmental, agricultural, food, and industrial samples. Based on the well-established flow injection analysis (FIA) principle, the instrument employs segmented, bubble-free liquid streams to deliver reproducible reaction kinetics, precise reagent/sample mixing, and controlled residence time within a dedicated manifold. Unlike classical batch or segmented-flow systems, the FIACompact utilizes continuous carrier stream transport, enabling rapid analysis cycles (typically 60–120 s per sample), minimal reagent consumption, and robust interference suppression through physical separation of reaction zones. Its core architecture integrates optical detection, fluidic actuation, thermal/UV digestion, and intelligent software control into a compact benchtop footprint—designed specifically for compliance-driven laboratories performing routine water quality monitoring and regulatory testing.

Key Features

• Dual independent 6-channel peristaltic pumps with stepper motor drive—enabling simultaneous handling of sample, reagents, standards, and digestants while supporting complex pre-analytical protocols including online UV/thermal digestion, analyte enrichment, dialysis, and matrix removal.
• 8-port injection valve with dual-volume loops (minimum 18 µL) for flexible sample/reagent metering and method-switching without hardware modification.
• Photometric detector with dual-chip silicon photodiode array—providing enhanced signal stability, automatic blank compensation (up to 0.5 A.U.), and turbidity correction per DIN EN 1189.
• Fixed-wavelength photometry using precision interference filters across 380–900 nm—optimized for common colorimetric reactions (e.g., indophenol blue for NH₄⁺, Griess for NO₂⁻, vanadomolybdophosphoric acid for o-PO₄³⁻).
• Integrated auto-dilutor module capable of single-point or serial dilution—ensuring accurate quantification beyond native calibration ranges without manual intervention.
• Modular method units pre-configured for standard parameters: NH₄-N (0.02–20 mg/L), NO₂-N (0.01–10 mg/L), NO₃-N (0.02–20 mg/L), o-PO₄-P (0.02–20 mg/L), TN (0.05–20 mg/L), TP (0.1–20 mg/L), CN⁻, phenols, MBAS, SiO₂, Fe, Mn, Cr(VI), SO₄²⁻, S²⁻, and formaldehyde.
• Compact mechanical design (300 × 140 × 450 mm; 7.5 kg) with low power draw (80 W)—suitable for shared lab environments and mobile analytical platforms.

Sample Compatibility & Compliance

The FIACompact accepts liquid samples across diverse matrices—including raw and treated drinking water, surface water, wastewater, seawater, soil extracts, plant digests, fertilizer solutions, beverages, and tobacco homogenates. Its bubble-free fluidic architecture minimizes carryover and supports direct analysis of moderately turbid or colored samples when paired with turbidity compensation algorithms. All validated methods align with internationally recognized standard procedures: ISO 11905-1 (NH₄⁺), ISO 6777 (NO₂⁻), ISO 11905-2 (NO₃⁻), ISO 15681-1 (o-PO₄³⁻), EN ISO 11905-3 (TN), and DIN 38405-29 (TP). The system meets GLP requirements for audit trail generation, electronic signature support (via FIAcontrol), and full data traceability—including method versioning, calibration history, and raw absorbance logs. Optional FDA 21 CFR Part 11 compliance packages are available upon configuration.

Software & Data Management

FIAcontrol software serves as the unified interface for method development, sequence programming, real-time monitoring, calibration management, and report generation. It supports ICH-compliant data integrity principles: all user actions are timestamped and logged, with immutable audit trails covering method changes, calibration events, and result modifications. Raw absorbance data (0–1.5 A.U.E.) is stored in vendor-neutral CSV and XML formats, compatible with LIMS integration via ODBC or REST API. Batch processing tools enable automated peak integration, baseline correction, and multi-point calibration curve fitting (linear, quadratic, or cubic). Validation reports include precision assessment (≤1% RSD), linearity evaluation (r² ≥ 0.999), and limit-of-detection calculations per IUPAC guidelines.

Applications

The FIACompact delivers reliable performance across regulated and research-oriented workflows. In environmental labs, it performs daily compliance testing for EPA Method 353.2 (nitrate/nitrite), ASTM D3867 (phosphate), and ISO 14429 (cyanide). In agronomy and soil science, it quantifies total Kjeldahl nitrogen (TKN), ammonium, and orthophosphate in digestates and leachates. Beverage and tobacco QA/QC teams use it for chloride, sulfide, and nitrate profiling under internal SOPs aligned with AOAC guidelines. Its modular flexibility allows method expansion—for example, coupling with post-column derivatization for anionic surfactants (MBAS) or catalytic UV digestion for total recoverable metals. The system’s low reagent consumption (0.4–3 mL per analysis) and <10-minute method changeover time make it ideal for multi-parameter screening in high-throughput settings.

FAQ

What standards does the FIACompact comply with?
It supports ISO, EN, and DIN standard methods for over 25 water and soil parameters—including ISO 11905 series, ISO 15681, EN ISO 11905-3, and DIN 38405-29—with optional validation documentation for ISO/IEC 17025 accreditation.

Can the FIACompact perform both sequential and parallel analyses?
Yes—its dual-pump architecture enables true parallel measurement of up to two independent parameters simultaneously, while its sequential mode supports >10-parameter screening per sample using method-switching logic within FIAcontrol.

Is online digestion included as standard equipment?
Thermal digestion is integrated; UV digestion is available as an optional module. Both support TN and TP determination per ISO 14851 and ISO 15681-2.

How is data integrity ensured during long-term operation?
FIAcontrol provides full ALCOA+ compliance: attributable, legible, contemporaneous, original, accurate, complete, consistent, enduring, and available records—including electronic signatures, role-based access control, and encrypted database backups.

What maintenance intervals are recommended for routine operation?
Peristaltic pump tubing should be replaced every 3–6 months depending on usage intensity; optical windows require cleaning every 2 weeks; calibration verification is advised before each analytical batch, with full system performance checks every 90 days.