LeiCi DZB-718L Portable Multi-Parameter Water Quality Analyzer

Overview

The LeiCi DZB-718L Portable Multi-Parameter Water Quality Analyzer is an integrated field-deployable instrument engineered for simultaneous, high-fidelity measurement of seven core water quality parameters: pH, conductivity, resistivity, total dissolved solids (TDS), salinity, dissolved oxygen (DO), and temperature. Designed in accordance with international electrochemical sensor principles—including potentiometric pH/ion sensing, four-electrode or two-electrode conductivity measurement (with automatic cell constant compensation), and Clark-type polarographic DO detection—the DZB-718L delivers laboratory-grade accuracy in a rugged, handheld form factor. Its architecture supports traceable, auditable measurements under field conditions typical of environmental monitoring, wastewater treatment compliance, drinking water distribution network assessment, and surface water quality surveys. The analyzer complies with foundational metrological standards for portable electrochemical instruments, including ISO 7888 (conductivity), ISO 5814 (DO), and ASTM D1293 (pH), and its data handling framework aligns with GLP (Good Laboratory Practice) documentation requirements.

Key Features

• High-resolution color touchscreen interface with intuitive bilingual (English/Chinese) navigation and adjustable backlight intensity
• IP65-rated enclosure ensuring dust-tight operation and protection against low-pressure water jets—suitable for outdoor, humid, or splash-prone environments
• Integrated triple-sensor measurement engine supporting concurrent pH/pX, conductivity/resistivity/TDS/salinity, and polarographic DO modules
• Intelligent electrode recognition and auto-calibration routines: supports up to 8-point pH/pX calibration, 5-point conductivity calibration, and dual-point (zero/full-scale) DO calibration
• Comprehensive temperature compensation: automatic compensation for pH, conductivity, and DO using built-in thermistor; optional atmospheric pressure compensation for DO (units: kPa, mbar, Torr, atm)
• Advanced power management: long-life rechargeable Li-ion battery with state-of-charge indicator, low-voltage warning, and support for USB-C or DC5V external charging (including mobile power banks)
• Flexible ion measurement capability: preconfigured modes for Na⁺, K⁺, NH₄⁺, Cl⁻, F⁻; supports concentration units including mol/L, mmol/L, mg/L, μg/L, and pX; enables standard addition, sample addition, and Gran plot methods

Sample Compatibility & Compliance

The DZB-718L is validated for use with natural waters (freshwater, estuarine, seawater), treated effluents, groundwater, and potable water supplies. Its electrode suite—including a tri-combination pH electrode, graphite-based conductivity cell (cell constant 0.1 or 1.0 cm⁻¹), and membrane-covered polarographic DO probe—is chemically stable across pH 0–14 and salinities up to 8.00%. All measurement algorithms implement linear and non-linear temperature compensation models per IUPAC and ISO guidelines. Data integrity meets GLP traceability requirements: each stored record includes timestamp, operator ID (with role-based access control), electrode serial numbers, calibration history, ambient temperature/pressure, and audit trail metadata. While not FDA 21 CFR Part 11–certified out-of-the-box, the system’s password-protected user hierarchy, electronic signature support (via PC software), and immutable export logs facilitate validation for regulated environmental laboratories operating under EPA Method 150.1 (pH), 120.1 (conductivity), and 360.1 (DO).

Software & Data Management

The analyzer stores up to 1,000 complete measurement records per parameter group, each containing raw sensor outputs, compensated values, and environmental context. Data retrieval supports chronological, parameter-filtered, or session-based browsing; trend visualization is rendered as time-series plots directly on-device. USB 2.0 interface enables bidirectional communication with Windows-based LeiCi LabLink software for advanced statistical analysis (mean, SD, RSD, linear regression), report generation (PDF/CSV), and LIMS integration via configurable CSV templates. Optional Bluetooth 4.2 module permits wireless transmission to tablets or field notebooks. U disk read/write capability allows offline data backup; QR code scanning (via optional USB barcode reader) links samples to preloaded site IDs or project codes. Firmware updates are delivered via signed binary packages to ensure system integrity and backward compatibility.

Applications

• Regulatory field monitoring per national water quality standards (e.g., China’s GB 3838–2002, US EPA Clean Water Act Tier 1 assessments)
• Rapid verification of disinfection byproduct precursors via pH-conductivity-TDS correlation analysis
• Wastewater treatment plant process control: aeration basin DO profiling, influent/effluent salinity tracking, and neutralization point detection
• Groundwater vulnerability studies requiring simultaneous redox (mV), ionic strength (conductivity), and oxygen saturation mapping
• Educational field labs and environmental science coursework emphasizing sensor cross-validation and method comparison
• Emergency response deployment during chemical spills or algal bloom events where multi-parameter real-time decision support is critical

FAQ

What calibration standards are supported for pH measurement?
The DZB-718L auto-recognizes six standardized buffer sets (GB, DIN, NIST, USA, MERK, JIS) and allows user-defined buffers with custom pH and temperature coefficients.
Can the instrument measure low-conductivity ultrapure water?
Yes—when paired with a 0.01 cm⁻¹ or 0.1 cm⁻¹ conductivity cell and pure water compensation mode, it achieves reliable resistivity readings up to 100.0 MΩ·cm.
Is dissolved oxygen measurement affected by altitude?
No—integrated barometric pressure compensation corrects for local atmospheric pressure, ensuring accurate % saturation and mg/L reporting at elevations up to 3,000 m.
How is data security enforced during multi-user operation?
Three-tier permission levels (Operator, Supervisor, Administrator) govern access to calibration, configuration, data deletion, and firmware update functions; all actions are logged with timestamps and user IDs.
Does the device meet international shipping and EMC requirements?
It conforms to IEC 61326-1 (industrial EMC) and UN 38.3 (lithium battery transport); CE marking is applicable for EU market deployment under relevant directives.