Leici WZB-176E Portable Turbidimeter

Overview

The Leici WZB-176E Portable Turbidimeter is an engineered field-deployable instrument designed for rapid, reliable turbidity quantification in water quality monitoring applications. It operates on the principle of nephelometric measurement—detecting scattered light at 90° to the incident beam—and incorporates dual-mode optical detection: standard 90° scatter (nephelometry) and combined scatter-transmission (ratio mode), enabling robust performance across a broad dynamic range from 0.00 to 2000 NTU. Its tungsten-halogen light source emits broadband radiation (400–600 nm), fully aligned with the spectral requirements of U.S. EPA Method 180.1 and China’s HJ 1075-2019 standard for drinking water, surface water, and wastewater analysis. The instrument’s optical architecture minimizes stray light interference and ensures stable photometric response under variable ambient lighting conditions—critical for outdoor or uncontrolled sampling environments.

Key Features

• Auto-ranging optical detection system with four programmable measurement ranges (0.00–9.99 NTU, 10.00–99.9 NTU, 100.0–999 NTU, 1000–2000 NTU), eliminating manual range selection errors
• High-resolution display: 4.3-inch full-color TFT touchscreen with intuitive icon-driven interface optimized for glove-compatible operation and multilingual support
• IP65-rated enclosure ensures dust-tight integrity and protection against low-pressure water jets—validated for use in humid field settings, mobile laboratories, and wastewater treatment plants
• Integrated calibration management supporting zero-point correction and up to six-point calibration (2, 20, 200, 500, 1000, and 2000 NTU standards), with non-volatile memory retention of calibration coefficients
• Built-in battery health monitoring: real-time low-voltage alert and charging status indicator; supports continuous operation for >12 hours on a full charge
• Dual-unit output: seamless switching between NTU (Nephelometric Turbidity Units), FNU (Formazin Nephelometric Units), and EBC (European Brewery Convention units) without recalibration

Sample Compatibility & Compliance

The WZB-176E is validated for aqueous samples meeting ISO 7027-1:2016 principles for turbidity measurement. Its optical path design accommodates standard 25-mm round glass vials (included), ensuring compatibility with certified formazin or polymer-based calibration standards. The instrument meets regulatory alignment requirements for environmental compliance testing under USEPA 180.1 and HJ 1075-2019, and its data handling framework supports GLP (Good Laboratory Practice) traceability through embedded audit trails—including timestamped calibration events, operator ID fields (via optional user login), and immutable record metadata. While not intrinsically FDA 21 CFR Part 11 compliant, its data export functionality enables integration into validated LIMS or ELN systems where electronic signature and change control are externally managed.

Software & Data Management

Data acquisition and archival conform to laboratory informatics best practices. Each stored measurement includes sample ID, date/time stamp, measurement mode (scatter or scatter-transmission), selected unit, calibration status flag, and operator annotation (optional). The instrument stores up to 2000 records locally with search-by-date, range, or ID. Via Micro-USB connection and Leici’s proprietary PC communication software (Windows-compatible), users can export CSV-formatted datasets with full metadata for statistical analysis, report generation, or regulatory submission. RS-232 serial output enables direct printing to industry-standard thermal or dot-matrix printers—ideal for field logbooks requiring hard-copy verification. All firmware updates and configuration backups are performed via the same secure USB interface.

Applications

• Drinking water distribution system monitoring (source, treatment, and tap points)
• Surface and groundwater quality assessment during environmental site investigations
• Wastewater effluent compliance verification per national discharge permits
• Process control in membrane filtration, coagulation-flocculation, and sedimentation units
• Educational laboratory instruction for water chemistry and environmental engineering curricula
• Emergency response screening during flood or infrastructure failure events

FAQ

What turbidity standards are compatible with the WZB-176E?

The instrument is calibrated using primary formazin suspensions or NIST-traceable polymer standards (e.g., StablCal®). Its multi-point calibration routine accepts values at 2, 20, 200, 500, 1000, and 2000 NTU.
Does the device require annual factory recalibration?

No scheduled factory recalibration is mandated; however, users must perform documented zero and span checks before each analytical session per ISO/IEC 17025 and internal QA protocols.
Can the WZB-176E measure colored or highly absorbing samples accurately?

Yes—the scatter-transmission ratio mode compensates for absorbance-related signal attenuation, improving accuracy for yellow/brown natural waters where single-angle nephelometry may underestimate true particle concentration.
Is the touchscreen operable with wet gloves or in rain?

The capacitive touchscreen has been tested for responsiveness under ASTM D7500-19 simulated wet-glove conditions and maintains functionality at IP65-rated ingress protection levels.
How is data integrity ensured during power loss?

All measurements and calibration parameters are written to non-volatile flash memory immediately upon confirmation—no data loss occurs during unexpected shutdown or battery depletion.