HORIBA D-55 Portable Multi-Parameter Water Quality Analyzer

Overview

The HORIBA D-55 Portable Multi-Parameter Water Quality Analyzer is an engineered field instrument designed for rapid, reliable in-situ assessment of critical water quality parameters in environmental monitoring, wastewater treatment, aquaculture, and freshwater resource management. Based on proven electrochemical measurement principles—including glass electrode potentiometry for pH and ORP, precision Pt1000 thermistor sensing for temperature, and four-electrode conductivity measurement—the D-55 delivers laboratory-grade accuracy in a rugged, handheld platform. Its dual-channel capability enables simultaneous measurement of two independent parameters (e.g., pH + conductivity or ORP + temperature), supporting efficient profiling without sequential sensor swapping. The device complies with fundamental metrological requirements aligned with ISO 7888 (conductivity), ISO 10523 (pH of water), and ASTM D1293 (pH of water), ensuring data integrity across regulatory and research applications.

Key Features

• IP67-rated enclosure—dust-tight and submersible to 1 m for 30 minutes—enabling robust operation in rain, splashing, or shallow immersion scenarios.
• Dual-channel real-time measurement architecture with automatic parameter pairing and cross-compensation (e.g., automatic temperature compensation for conductivity and pH).
• Integrated self-diagnostic system continuously monitors electrode impedance, battery voltage, sensor connection integrity, and calibration status; flags anomalies via on-screen icon and audible alert.
• High-contrast backlit LCD display (128 × 64 pixels) with intuitive menu navigation, unit toggling, and real-time graphing of trended values over time.
• Auto-data logging with internal memory capacity for up to 2,000 measurement records, timestamped with date/time and user-defined site ID.
• RS-232C serial interface supports direct PC connectivity for real-time data streaming, batch export (CSV/ASCII), and firmware updates via HORIBA’s dedicated configuration software.

Sample Compatibility & Compliance

The D-55 is validated for use with natural waters (rivers, lakes, groundwater), treated effluents, drinking water distribution systems, and aquaculture ponds. It accommodates standard DIN/ISO-compliant glass pH electrodes, redox (Pt or Ag/AgCl) electrodes, and interchangeable conductivity cells with cell constants of 0.01, 0.1, and 1.0 cm⁻¹ (K = 10, 100, 1000 m⁻¹). All measurements adhere to GLP-aligned documentation practices: each stored record includes operator ID, calibration history reference, sensor serial numbers, ambient temperature, and measurement duration. While not FDA 21 CFR Part 11-certified as a standalone system, the D-55’s audit-trail-capable data export workflow supports integration into validated LIMS environments under ISO/IEC 17025-accredited laboratories.

Software & Data Management

HORIBA provides the free D-55 Configuration & Data Manager software (Windows-compatible) for instrument setup, calibration curve management (up to 3-point pH and 2-point conductivity), and post-measurement analysis. The software enables spectral visualization of temporal trends, statistical summary (mean, SD, min/max), and automated report generation compliant with ISO 5725 repeatability guidelines. Exported datasets include embedded metadata (GPS coordinates if connected via optional Bluetooth GPS module), sensor drift logs, and raw analog-to-digital conversion values—facilitating traceability during QA/QC review or third-party verification.

Applications

• Regulatory compliance monitoring per national surface water standards (e.g., EPA Method 150.1 for conductivity, APHA 4500-H⁺ B for pH).
• Rapid response field screening during spill incidents or algal bloom events, where concurrent pH, ORP, and conductivity shifts indicate redox-active contaminant ingress.
• Performance validation of point-of-use water treatment units (e.g., ion exchange, reverse osmosis) through pre-/post-filter parameter differentials.
• Long-term ecological studies requiring low-power, battery-operated deployment at remote sites with minimal maintenance intervals (typical battery life: 200+ hours continuous use).
• Educational field labs—designed for undergraduate hydrology and environmental science curricula emphasizing hands-on sensor calibration, error propagation analysis, and uncertainty budgeting.

FAQ

Does the D-55 support automatic temperature compensation for all measured parameters?

Yes—temperature is measured continuously via integrated Pt1000 sensor and applied in real time to pH, ORP, and conductivity calculations using NIST-traceable algorithms.
Can I perform multi-point calibration directly on the device?

The D-55 supports 1–3 point pH calibration and 1–2 point conductivity calibration using on-screen prompts and buffer recognition; no external PC required.
Is the internal memory data recoverable if the battery is fully depleted?

Yes—stored measurement records are retained in non-volatile flash memory and remain accessible after battery replacement or power cycling.
What conductivity cell constants are supported out of the box?

The D-55 accepts interchangeable electrodes with K = 0.01, 0.1, and 1.0 cm⁻¹; cell constant is manually entered during setup to ensure correct range scaling and unit conversion.
Does HORIBA provide calibration certification for the D-55 upon purchase?

Each unit ships with a factory calibration certificate (traceable to JCSS standards); optional UKAS-accredited calibration services are available through authorized service centers.