Hach HQ440D Multi-Parameter Benchtop Water Quality Analyzer Kit (Order No. 8508700)
| Brand | Hach |
|---|---|
| Origin | USA |
| Manufacturer | Hach Company |
| Instrument Type | Benchtop Multi-Parameter Analyzer |
| Electrode Configuration | IntelliCAL pH, Conductivity, and LDO Dissolved Oxygen Probes with 1-m Cables |
| pH Range | 0–14 |
| Temperature Range | −10 to 110 °C |
| mV Range | ±1500 mV |
| DO Range | 0–20 mg/L or 0–200% saturation |
| Pressure Range | 50–110 kPa |
| Conductivity Range | 0.01–200 mS/cm |
| Resistivity Range | 2.5 Ω·cm–49 MΩ·cm |
| Salinity Range | 0–42 g/kg (‰) |
| TDS Range | 0–50,000 mg/L |
| pH Resolution | 0.001–0.1 |
| Temperature Resolution | 0.1 °C |
| DO Resolution | 0.01 mg/L or 0.1% |
| Conductivity Resolution | 0.01 μS/cm or 0.1 mS/cm (auto-ranging) |
| TDS Resolution | 0.1 mg/L or 0.1 g/L |
| Salinity Resolution | 0.01 ppt |
| pH Accuracy | ±0.002 |
| Temperature Accuracy | ±0.3 °C |
| mV Accuracy | ±0.1 mV |
| DO Accuracy | ±0.1 mg/L (0.1–8 mg/L), ±0.2 mg/L (8–20 mg/L) |
| Conductivity Accuracy | ±0.5% of reading |
| TDS Accuracy | ±0.5% of reading |
| Salinity Accuracy | ±0.1 ppt |
| Data Storage Capacity | 500 measurements |
| Calibration Points | Up to 4-point |
| Temperature Compensation | Automatic or manual |
| GLP Compliance | Full audit trail, calibration history, electrode ID logging |
| Ingress Protection Rating | IP67 |
| Power Supply | 4× AA batteries / USB bus power / optional external DC adapter |
Overview
The Hach HQ440D Multi-Parameter Benchtop Water Quality Analyzer Kit (Order No. 8508700) is a rigorously engineered laboratory-grade platform designed for precise, traceable, and repeatable measurement of critical water quality parameters in environmental, municipal, industrial, and research laboratories. Built upon Hach’s proven HQ platform architecture, the system integrates electrochemical sensing principles—including potentiometric pH measurement, four-electrode conductivity determination, and luminescence-based dissolved oxygen (LDO) detection—into a single, unified instrument chassis. Unlike amperometric DO sensors requiring membrane replacement and electrolyte refills, the LDO technology employs phase-fluorometry: an oxygen-sensitive ruthenium complex immobilized on the sensor tip quenches fluorescent emission proportionally to partial pressure of O₂, enabling drift-free, maintenance-free operation over extended deployment cycles. The HQ440D supports simultaneous real-time acquisition of up to six parameters (pH, mV, temperature, DO, conductivity, resistivity, salinity, TDS), with automatic parameter recognition via IntelliCAL electrode RFID tags—ensuring method integrity and eliminating manual configuration errors.
Key Features
- IntelliCAL electrode auto-recognition: Each probe embeds an RFID chip storing calibration history, serial number, sensor type, and user-defined method settings—enabling plug-and-play operation and full traceability per ISO/IEC 17025 and EPA Method 150.1 requirements.
- LDO (Luminescent Dissolved Oxygen) sensor: Eliminates membrane fouling, electrolyte depletion, and polarization delays; certified per ASTM D888-22 for field and lab use; stable across temperature gradients and low-flow conditions.
- High-resolution graphical LCD with backlight: Supports dual-parameter display, real-time trend graphs, and intuitive icon-driven navigation—even under low-ambient-light laboratory conditions.
- Robust benchtop enclosure rated IP67: Dust-tight and submersible to 1 m for 30 minutes—ideal for wet-lab environments where spills, condensation, or cleaning protocols demand ingress protection.
- Comprehensive GLP compliance: Timestamped calibration logs, operator ID fields, electrode health diagnostics, and full audit trail exportable via USB to CSV or proprietary .hqd format—fully aligned with FDA 21 CFR Part 11 electronic record requirements when paired with Hach’s LabStation software.
- Flexible power architecture: Operates on alkaline AA batteries (up to 2,000 hours), USB bus power (for continuous data streaming), or optional 12 V DC adapter—enabling uninterrupted operation during long-duration stability studies or regulatory audits.
Sample Compatibility & Compliance
The HQ440D kit is validated for aqueous matrices including drinking water, wastewater effluents, surface water, groundwater, process water, and ultrapure water (UPW) systems. Its ultra-low-conductivity mode (down to 2.5 Ω·cm) and high-purity pH electrode (with double-junction reference and low-drift glass formulation) meet ASTM D1125, ISO 10523, and USP specifications for pharmaceutical water testing. All IntelliCAL electrodes comply with IEC 60746-2 (electrochemical analyzers) and carry CE, UKCA, and RoHS certifications. The system supports method validation per EPA Methods 150.1 (conductivity), 365.1 (phosphate—when used with compatible colorimetric modules), and 4500-O G (dissolved oxygen). Calibration verification includes NIST-traceable buffer standards (pH 4.01, 7.00, 10.01), KCl conductivity standards (84 µS/cm, 1413 µS/cm, 12.88 mS/cm), and Winkler titration cross-checks for DO accuracy verification.
Software & Data Management
Data transfer occurs via native USB 2.0 interface to Windows-based Hach LabStation v4.x or open-standard CSV export. LabStation provides full GLP-compliant data review: spectral overlays of calibration curves, electrode response time analysis, outlier flagging based on user-defined thresholds, and automated report generation compliant with ISO/IEC 17025 clause 7.8. Raw data files include embedded metadata (operator, location, ambient temperature, barometric pressure, electrode SN, calibration date/time, and uncertainty estimates per GUM framework). For enterprise integration, the HQ440D supports Modbus RTU over USB-to-serial adapters, enabling direct ingestion into LIMS platforms such as LabWare LIMS or Thermo Fisher SampleManager via custom OPC UA drivers. All firmware updates are digitally signed and delivered through Hach’s secure Customer Portal—ensuring cryptographic integrity and version control traceability.
Applications
- Regulatory compliance monitoring for NPDES permits and Safe Drinking Water Act (SDWA) reporting.
- Pharmaceutical water system qualification (PW, WFI, UPW) per USP , EP 2.2.38, and JP 2.05.
- Wastewater treatment plant influent/effluent QC, including nitrification/denitrification process control.
- Environmental field lab support for EPA Region 10 and USGS NWIS protocols.
- Academic and government research requiring multi-parameter correlation studies (e.g., pH–alkalinity–conductivity–DO relationships in eutrophication modeling).
- Calibration verification labs performing interlaboratory comparisons under ILAC-P10 guidelines.
FAQ
Does the HQ440D support automatic temperature compensation for all measured parameters?
Yes—ATC is applied independently per parameter using integrated Pt1000 thermistors in each IntelliCAL probe and the main unit. Users may override with manual input for fixed-temperature validation studies.
Can the system store calibration data for multiple electrodes simultaneously?
Yes—each IntelliCAL electrode retains its own calibration history (up to 10 calibrations per probe) and method configuration; the HQ440D automatically loads the correct profile upon connection.
Is the LDO electrode suitable for measuring dissolved oxygen in seawater?
Yes—the LDO sensor compensates for salinity and temperature in real time using built-in algorithms conforming to APHA Standard Methods 4500-O G, delivering accurate results across 0–42 ppt salinity.
What GLP documentation is generated during calibration?
Full electronic records include date/time stamp, operator ID, electrode serial number, standard lot numbers, measured vs. expected values, residual error, pass/fail status, and digital signature—exportable as PDF or CSV.
How often does the LDO sensor require recalibration?
Typically every 3–6 months under routine lab use; however, Hach recommends verification against air-saturated water or Winkler titration before critical analyses per ISO 5814:2012.
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