HORIBA DS-70 Series Benchtop Conductivity Meter

Overview

The HORIBA DS-70 Series Benchtop Conductivity Meter is a precision-engineered laboratory instrument designed for high-accuracy, regulatory-compliant measurement of electrical conductivity, resistivity, salinity, and total dissolved solids (TDS) in aqueous samples. Built upon a dual-electrode AC excitation principle with automatic frequency selection and real-time temperature compensation (based on built-in Pt1000 sensor), the DS-70 series ensures stable, drift-free readings across wide dynamic ranges — from ultrapure water (18.2 MΩ·m) to highly conductive industrial effluents. Its architecture adheres to fundamental metrological requirements for traceable water quality analysis, supporting routine calibration verification, system suitability testing, and continuous compliance monitoring per pharmacopoeial standards including USP , European Pharmacopoeia 2.2.38, Japanese Pharmacopoeia (JP), and Chinese Pharmacopoeia (CP). The DS-71 and DS-72 models share identical core measurement electronics and electrochemical performance but differ in human-machine interface sophistication: the DS-71 employs a monochrome LCD with intuitive menu navigation, while the DS-72 integrates a full-color capacitive touchscreen with context-aware guidance for setup, calibration, troubleshooting, and maintenance.

Key Features

• Intelligent on-screen navigation system guiding users step-by-step through calibration, measurement, electrode diagnostics, and error resolution — reducing operator dependency and training time.
• Comprehensive regulatory support: preconfigured modes for JIS Z 8802, USP Purified Water/Injection Water protocols, EP 2.2.38 conductivity limits, and multi-pharmacopoeia TDS conversion algorithms.
• Triple-cell-constant compatibility (10, 100, and 1000 m⁻¹) enabling seamless transition between low-conductivity ultrapure water and high-salinity process streams without hardware change.
• GLP/GMP-ready data integrity framework: timestamped measurements with user ID logging, audit-trail-capable USB data export, and optional integration with certified thermal printers for hard-copy documentation.
• Robust electrochemical design featuring easy-clean glass-body conductivity cells with integrated temperature sensors, minimizing polarization effects and ensuring long-term stability.
• Extended temperature measurement range (–30.0 to 130.0 °C) with ±0.1 °C repeatability, suitable for hot-process validation and chilled-water system monitoring.

Sample Compatibility & Compliance

The DS-70 series is validated for use with deionized water, purified water, water for injection (WFI), pharmaceutical process streams, environmental surface waters, wastewater effluents, and saline solutions up to 80 ppt. Its measurement algorithm applies standardized temperature compensation (linear and non-linear NIST-based models) and accounts for cell geometry via user-defined cell constants. All models meet ISO/IEC 17025 traceability requirements when used with NIST-traceable reference standards (e.g., KCl solutions at 25 °C). The DS-72 further supports FDA 21 CFR Part 11 compliance through encrypted USB data archives, electronic signature prompts, and configurable access controls — making it suitable for regulated QC laboratories operating under GMP or ISO 9001 frameworks.

Software & Data Management

Data acquisition and reporting are managed via native firmware with no external software dependency. Up to 2000 measurement records (DS-72) or 999 records (DS-71) are stored internally with full metadata: date/time stamp, temperature, conductivity/resistivity/TDS/salinity values, cell constant, calibration status, and operator ID. USB connectivity enables direct export to CSV or Excel-compatible formats; the DS-72 additionally supports USB flash drive logging for unattended batch recording. Multi-language UI (English, Japanese, Chinese, Korean) facilitates global deployment without retraining. Firmware updates are performed via USB, ensuring long-term adaptability to evolving pharmacopoeial revisions.

Applications

• Pharmaceutical water system qualification (PW, WFI, SW) per USP/EP/JP/CP monographs.
• Environmental monitoring of surface water, groundwater, and wastewater discharge compliance.
• Power plant boiler feedwater and condensate purity verification.
• Food & beverage production line control for rinse water, CIP solution conductivity, and brine concentration.
• Academic and research laboratories requiring reproducible, publication-grade conductivity datasets.
• Calibration laboratories performing inter-laboratory comparison studies under ISO/IEC 17025.

FAQ

Does the DS-70 series support automatic temperature compensation (ATC)?

Yes — all models incorporate an integrated Pt1000 temperature sensor and apply programmable linear or non-linear compensation curves per IEC 60746-3 and ASTM D1125 standards.
Can the DS-72 generate audit-trail-compliant reports for FDA-regulated environments?

When configured with user authentication and USB-archived data logs, the DS-72 meets core elements of 21 CFR Part 11 for electronic records and signatures.
What conductivity cell constants are supported?

The instrument accepts electrodes with cell constants of 10 m⁻¹, 100 m⁻¹, and 1000 m⁻¹ — selectable via menu and auto-recognized via electrode coding (where applicable).
Is external software required to export data?

No — data export is handled natively via USB connection; no proprietary drivers or applications are needed.
How often does the instrument require recalibration?

Calibration interval depends on usage intensity and sample matrix; typical laboratory practice recommends daily verification with standard solution and full two-point calibration at least once per shift in regulated environments.