FangZhou DDS-609 Pharmaceutical Water Conductivity Meter
| Brand | FangZhou |
|---|---|
| Origin | Sichuan, China |
| Model | DDS-609 |
| Form Factor | Benchtop |
| Application | Laboratory |
| Conductivity Range | (0–2×10⁵) µS/cm |
| TDS Range | (0.00–300.0) g/L |
| Resistivity Range | (5.00–10⁸) Ω·cm |
| Salinity Range | (0.00–80.00) ppt |
| Temperature Range | (−25.0–135.0) °C |
| Accuracy | ±0.5% FS |
| Minimum Resolution | 0.0001 µS/cm |
| Compliance | ISO 9001, GLP-ready, supports USP <645>, EP 2.2.38, and ChP 0407 |
Overview
The FangZhou DDS-609 Pharmaceutical Water Conductivity Meter is a benchtop electrochemical analyzer engineered for high-precision, regulatory-compliant measurement of conductivity, resistivity, total dissolved solids (TDS), salinity, conductivity ash, and temperature in purified water systems used across pharmaceutical manufacturing, biotechnology, and quality control laboratories. It operates on the principle of two-electrode or four-electrode conductometric measurement, with automatic electrode constant determination and real-time temperature compensation based on either linear or non-linear algorithms per ICH Q5A and USP requirements. Designed specifically for pharmacopeial water qualification—covering Purified Water (PW), Water for Injection (WFI), and Ultra-Pure Water (UPW) per EP 2.2.38 and ChP 0407—the instrument implements dedicated water-grade modes (Pharmaceutical Grade I/II/III, WFI, EW-I/EW-II/EW-III) with configurable alarm thresholds, audit-trail-capable user authentication, and full traceability aligned with GLP and GMP documentation practices.
Key Features
- 8-range auto-ranging conductivity measurement with dynamic resolution from 0.0001 to 1 µS/cm, enabling seamless transition across ultrapure water (≤0.055 µS/cm at 25°C) to highly conductive process streams
- Dual temperature compensation modes: Automatic (ATC) via integrated Pt1000 sensor or Manual (MTC) input; configurable reference temperature (15.0–25.0°C) and temperature coefficient (0.0–10.0%/°C)
- Comprehensive electrode management system: Stores electrode ID, calibration history, date-stamped K-factor updates, and status flags (e.g., “calibrated”, “expired”, “in service”)
- Regulatory-grade data integrity: Full GLP compliance with time/date stamping, operator ID logging, method version control, and electronic signature support for critical measurements
- Multi-standard calibration library: Preloaded with 4 Chinese national standard solutions (GB/T 6682), 6 international standards (ASTM D1125, ISO 7888, USP ), plus 1 user-defined solution slot
- Configurable TDS conversion factor (0.20–1.00, default 0.50) and adjustable conductivity ash calculation parameters for excipient or buffer analysis
Sample Compatibility & Compliance
The DDS-609 is validated for use with aqueous samples meeting pharmacopeial purity specifications—including USP , EP 2.2.38, JP 2.07, and ChP 0407—and supports routine verification of distribution loop conductivity, point-of-use monitoring, and post-purification validation. Its sealed, IP54-rated enclosure ensures stable operation in controlled laboratory environments. All firmware and calibration records adhere to FDA 21 CFR Part 11 principles through role-based access control (RBAC), audit trail generation, and immutable data storage. The instrument meets ISO 9001:2015 quality management system requirements and is routinely deployed in facilities undergoing MHRA, EMA, or NMPA inspections.
Software & Data Management
Data handling is governed by an embedded 16 MB flash memory capable of storing ≥100,000 measurement records with full metadata: sample ID, method name, electrode serial number, calibration timestamp, ambient temperature, and diagnostic flags. Export is supported via RS-232 and USB interfaces in three report formats: Simple (CSV), Standard (PDF with header/footer), and GLP-compliant (with digital signature field, operator ID, instrument ID, and calibration certificate linkage). Integrated PC software enables direct import into Excel, Word, or LIMS platforms using native .xlsx and .docx protocols—no proprietary drivers required. All stored methods (up to 1000) include parameter lockout, version history, and copy/edit/delete permissions assigned per user role.
Applications
- USP Stage 1–3 conductivity testing of Purified Water and Water for Injection
- Continuous monitoring of reverse osmosis (RO), electrodeionization (EDI), and distillation system effluent
- Validation of clean-in-place (CIP) rinse endpoints and steam condensate purity
- TDS quantification in formulation buffers and cell culture media preparation
- Resistivity trending for ultrapure water loops serving semiconductor-grade applications (EW-I/EW-II/EW-III)
- Salinity assessment in saline vehicle preparations and dialysate quality control
FAQ
Does the DDS-609 comply with USP requirements for conductivity measurement?
Yes—it implements all mandatory features including non-linear temperature compensation, stage-specific alarm logic, reference temperature configuration, and documented electrode calibration traceability per USP Chapter .
Can the instrument store calibration records with electronic signatures?
Yes—each calibration event logs user ID, timestamp, standard solution lot number, measured value, and deviation from certified value; all entries are write-protected and exportable in GLP format.
What electrode constants are supported?
Four standardized cell constants are selectable: 0.01 cm⁻¹ (for ultrapure water), 0.1 cm⁻¹ (low-conductivity PW), 1.0 cm⁻¹ (general lab use), and 10 cm⁻¹ (high-salinity samples).
Is offline data analysis possible without proprietary software?
Yes—CSV exports open natively in Excel; PDF/GLP reports retain full formatting and metadata without third-party viewers.
How does the system handle electrode drift detection?
Built-in diagnostics continuously monitor electrode impedance, polarization voltage, and signal stability; deviations trigger warning icons and optional auto-lockout of measurement mode until recalibration.
