HK-8620 Continuous Flow Analyzer
| Brand | Huake Instrument |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | HK-8620 |
| Pricing | Available Upon Request |
Overview
The HK-8620 Continuous Flow Analyzer is a robust, laboratory-grade segmented flow analysis (SFA) system engineered for high-throughput, reproducible quantification of inorganic and organic analytes in aqueous and digested environmental, agricultural, and food matrices. Based on the classical air-segmented continuous flow principle—where discrete sample zones are separated by precisely injected air bubbles within a narrow-bore PTFE or silicone tubing manifold—the HK-8620 ensures minimal cross-contamination, stable reaction kinetics, and consistent dispersion profiles across extended analytical runs. Designed to meet routine monitoring requirements under ISO 15587-1 (water quality — determination of total nitrogen), ISO 6777 (ammonia-nitrogen), ISO 11923 (phosphorus compounds), and ASTM D1253 (residual chlorine), the system supports method compliance for regulatory reporting in municipal water utilities, environmental testing laboratories, and third-party certification facilities.
Key Features
- Air-segmented flow architecture with programmable peristaltic pump sequencing for precise reagent/sample aspiration and zone segmentation
- Modular optical detection units: dual-beam photometers (400–900 nm) with temperature-stabilized flow cells (10 mm pathlength) and optional UV-Vis extension for low-concentration nitrate/nitrite assays
- Integrated thermal reaction coils (37–100 °C) for controlled digestion, color development, and enzymatic reactions (e.g., urease-catalyzed urea hydrolysis)
- Automated calibration and blank correction routines with multi-point standardization capability (up to 8 standards + 2 blanks per run)
- Robust fluidic design using chemically resistant tubing (Pharmed BPT, Tygon E-3603) and corrosion-resistant fittings compatible with acidic, alkaline, and surfactant-laden streams
- Onboard diagnostics including flow rate verification, bubble detection, and pressure monitoring to ensure analytical continuity and flag system anomalies
Sample Compatibility & Compliance
The HK-8620 accommodates liquid samples with suspended solids ≤ 50 µm (pre-filtered via 0.45 µm membrane); it accepts direct injection of clarified surface water, treated wastewater effluents, seawater (with salinity compensation), soil extracts (CaCl₂ or KCl leachates), plant tissue digests (HNO₃/H₂O₂ microwave-assisted), fertilizer solutions, feed homogenates (after acid digestion), and clarified beverage filtrates. All validated methods align with EPA Method 353.2 (nitrate/nitrite), ISO 6778 (cyanide), ISO 11923 (orthophosphate), and USP (total organic carbon—indirect via persulfate oxidation). The system architecture supports GLP-compliant data integrity through audit-trail-enabled software (see Software section) and is suitable for ISO/IEC 17025-accredited laboratories performing routine water quality surveillance.
Software & Data Management
Control and data acquisition are managed via HK-Analyzer v4.2 software—a Windows-based application compliant with FDA 21 CFR Part 11 requirements. It provides electronic signatures, role-based user access control (administrator/operator/auditor), immutable audit trails for method changes, calibration events, and result modifications, and automatic generation of PDF reports with embedded chromatograms, calibration curves, and QC statistics (e.g., %RSD, recovery %, LLOQ/ULOQ validation). Raw signal files (.raw) and processed results (.csv, .xlsx) are stored with time-stamped metadata and support LIMS integration via ASTM E1394 or HL7-compatible export protocols.
Applications
- Water & Wastewater: Ammonia-N, nitrate-N, nitrite-N, total N (via persulfate digestion), orthophosphate, total P, cyanide (pyridine-barbituric acid), phenols (4-aminoantipyrine), anionic surfactants (MBAS), sulfide (methylene blue), fluoride (SPADNS), chloride (mercuric thiocyanate), hardness (EDTA titration surrogate), alkalinity (acid titration)
- Soil & Plant Tissue: NH₄⁺-N, NO₃⁻-N, Kjeldahl N, phosphate, sulfate, potassium (via turbidimetric precipitation), boron (curcumin), bromide (chloramine-T oxidation)
- Fertilizers & Feeds: Urea (diazotization), fluoride (ion-selective electrode coupling), total K (flame photometry interface option)
- Food & Beverages: Glucose (glucose oxidase), reducing sugars (Somogyi-Nelson), total sugar (anthrone), acidity (pH-stat titration module), sulfur dioxide (iodometric), nitrate (cadmium reduction)
FAQ
What sample throughput can be achieved on the HK-8620 for ammonia-N analysis?
Typical cycle time is 90–120 seconds per sample, enabling up to 40 analyses per hour with automated dilution and standard addition.
Is the system compatible with existing laboratory information management systems (LIMS)?
Yes—HK-Analyzer supports ASTM E1394-compliant data export and configurable ODBC connectivity for seamless LIMS integration.
Can the HK-8620 perform simultaneous multi-analyte determination in a single run?
No—it operates in single-channel sequential mode; however, modular detector expansion (up to 4 independent photometers) enables parallel analysis of different analytes when configured with dedicated manifolds.
What maintenance intervals are recommended for long-term operational stability?
Peristaltic pump tubing should be replaced every 3–6 months depending on usage; optical windows require cleaning every 2 weeks; annual calibration verification against NIST-traceable standards is advised.
Does the system support unattended overnight operation?
Yes—equipped with auto-shutdown, reagent level sensors, and alarm-triggered pause functionality for safe extended runs.
