LeiCi DZS-708L Multi-Parameter Water Quality Analyzer

Overview

The LeiCi DZS-708L Multi-Parameter Water Quality Analyzer is a modular, laboratory-grade analytical platform engineered for precise, traceable, and compliant measurement of critical water quality parameters across environmental monitoring, municipal water treatment, pharmaceutical manufacturing, and academic research applications. Built on a dual-channel architecture with four physically independent measurement ports, the instrument enables simultaneous or sequential analysis of pH, redox potential (ORP), ion activity (pX), electrical conductivity (EC), resistivity, total dissolved solids (TDS), salinity, ash content, dissolved oxygen (DO) concentration and saturation, and temperature — all within a single integrated system. Its core measurement principles include potentiometric detection (for pH, ORP, and ion-selective electrodes), conductometric analysis (using both two-electrode and four-electrode cells for wide-range EC/TDS/resistivity), and optical fluorescence (for DO-F) or electrochemical polarography (for DO-P). The system adheres to fundamental metrological standards for accuracy, repeatability, and temperature compensation, with each module calibrated against internationally recognized reference materials and traceable to national metrology institutes.

Key Features

• 7-inch high-resolution color TFT touchscreen with intuitive graphical interface supporting English and Chinese languages, configurable temperature units (°C/°F), and real-time parameter visualization.
• Modular plug-and-play design with six certified measurement modules: pH, pX, EC-T (two-electrode conductivity), EC-F (four-electrode conductivity), DO-F (fluorescence-based dissolved oxygen), and DO-P (Clark-type polarographic dissolved oxygen).
• Four independent analog input channels enabling concurrent multi-parameter acquisition without cross-talk or signal interference.
• Automated electrode recognition and intelligent endpoint detection using adaptive algorithms for stable reading, timed intervals, or manual triggering.
• Comprehensive calibration management including multi-point (up to 6-point) pH/pX calibration, 1–5 point conductivity standardization, and dual-point (zero/full-scale) DO verification — all with automatic buffer recognition (NIST, DIN, GB, JIS, ASTM, MERK, USA).
• IP54-rated enclosure suitable for controlled laboratory environments with protection against dust ingress and low-pressure water splashes.
• Firmware-upgradable architecture ensuring long-term adaptability to evolving regulatory and methodological requirements.

Sample Compatibility & Compliance

The DZS-708L accommodates a broad range of aqueous matrices, including drinking water, wastewater, surface water, groundwater, seawater, process water, and pharmaceutical-grade purified water (PW/WFI). Its modular sensor compatibility supports glass pH electrodes, solid-state and liquid-filled reference electrodes, ion-selective electrodes (ISEs) for Ag⁺, Na⁺, K⁺, F⁻, Cl⁻, NO₃⁻, Ca²⁺, and others, platinum black or stainless steel conductivity cells (0.01–10 cm⁻¹ cell constants), and both optical (ruthenium-based) and electrochemical (membrane-covered Clark-type) DO probes. The analyzer meets functional requirements aligned with ISO 5667 (water sampling), ISO 7888 (conductivity), ISO 5814 (DO by electrochemical probe), ISO 10523 (pH), and ASTM D1293 (pH of water). It provides configurable audit trails, electronic signatures, and time-stamped event logging — fully supporting GLP (Good Laboratory Practice) and GMP (Good Manufacturing Practice) workflows in regulated industries. Data integrity features comply with FDA 21 CFR Part 11 for electronic records and signatures when used with validated PC software and secure network configurations.

Software & Data Management

Data handling is governed by an embedded operating system designed for regulatory compliance and operational transparency. The instrument stores ≥1000 complete measurement records per parameter type (e.g., 1000 pH readings, 1000 DO saturation values), along with 100 calibration datasets and 1000 standard verification logs per module. All entries are timestamped, user-attributed, and linked to electrode IDs, calibration history, and environmental conditions. Three-tier user permission levels (Administrator, Supervisor, Operator) enforce role-based access control. Method management includes 16 preconfigured protocols (e.g., EPA 150.1 for conductivity, USP for PW conductivity, ASTM D512 for chloride ISE) and supports creation, validation, and versioning of custom methods. Data export is supported via USB drive in CSV (for spreadsheet analysis) or PDF (for report generation) formats. RS-232 output enables direct printing to compatible serial printers with customizable report templates. PC connectivity via USB allows bidirectional synchronization using LeiCi’s certified communication software — enabling remote diagnostics, batch report generation, statistical analysis (mean, SD, RSD, confidence intervals), and integration into LIMS environments.

Applications

The DZS-708L serves as a primary analytical tool in municipal water utilities for routine compliance testing under national drinking water standards (e.g., China’s GB 5749-2022, EU Directive 98/83/EC). In environmental laboratories, it supports field-deployable lab verification of surface and groundwater quality per ISO 5667 series and national EPA guidelines. Within pharmaceutical QC labs, it verifies conductivity and TOC-related parameters in purified water systems per USP and Ph. Eur. 2.2.38. Academic researchers employ its pX module for ion activity studies in soil leachates or biological fluids, while its dual DO modules allow comparative validation between fluorescence and polarographic methodologies. The EC-F module’s high-conductivity capability (up to 3000 mS/cm) makes it suitable for brine, industrial effluent, and desalination concentrate analysis. Its temperature-compensated resistivity mode supports ultrapure water monitoring in semiconductor fab facilities.

FAQ

Does the DZS-708L support FDA 21 CFR Part 11 compliance?
Yes — when operated with validated firmware, configured user authentication, enabled audit trail logging, and paired with approved PC software and secure network infrastructure.
Can multiple modules be used simultaneously?
Yes — the four-channel architecture permits concurrent operation of up to four modules (e.g., pH + EC-T + DO-F + temperature), provided physical probe connections and power allocation are within specification.
What calibration standards are preloaded?
The system recognizes NIST, DIN, GB, JIS, ASTM, MERK, and USA pH and conductivity buffer sets automatically upon electrode immersion.
Is external autosampler integration supported?
Yes — the instrument features TTL-level trigger I/O and RS-232 command protocol compatibility for seamless integration with third-party autosamplers.
How is data integrity ensured during power loss?
The device implements non-volatile memory with battery-backed real-time clock and automatic save-on-interrupt functionality to prevent data corruption during unexpected shutdowns.
Are firmware updates provided post-purchase?
Yes — LeiCi releases periodic firmware revisions through authorized distributors, addressing performance enhancements, new method additions, and regulatory alignment updates.