Truelab WGZ-200A Advanced Portable Turbidimeter
| Key | Brand: Truelab |
|---|---|
| Origin | Shanghai, China |
| Model Series | WGZ-200A, WGZ-2A, WGZ-2, WGZ-3, WGZ-3A, WGZ-100 |
| Type | Portable Turbidimeter |
| Measurement Principle | 90° Nephelometric Scattering |
| Range | 0–1000 NTU (model-dependent) |
| Resolution | 0.001–0.01 NTU |
| Accuracy | ±2% F.S. |
| Repeatability | ≤1% |
| Zero Drift | ±0.5% F.S. (at 0.02–0.1 NTU) |
| Operating Temperature | 25 °C ambient |
| Compliance | ISO 7027, ASTM D6508, USP <241>, GLP-ready architecture |
Overview
The Truelab WGZ-200A is a high-stability, microprocessor-controlled portable turbidimeter engineered for precise nephelometric measurement of suspended particulate matter in aqueous and optically transparent liquid media. Based on the internationally standardized 90° light scattering principle (ISO 7027), it quantifies turbidity in Nephelometric Turbidity Units (NTU) by detecting scattered light intensity at a right angle to the incident beam path. This optical configuration minimizes interference from sample color absorption and enhances sensitivity to fine colloidal particles—critical for compliance with drinking water standards (e.g., WHO Guidelines, EPA Method 180.1) and pharmaceutical process water monitoring (USP ). The instrument’s optical train integrates a long-life, low-drift LED light source with thermally stabilized emission characteristics, enabling consistent performance after only 30 seconds of warm-up—eliminating downtime in field or mobile laboratory deployments.
Key Features
- Multi-range capability across model variants: WGZ-200A (0–200 NTU), WGZ-3A (0–500 NTU), and WGZ-1000-equivalent configurations (0–1000 NTU) support broad application scalability—from low-turbidity ultrapure water (e.g., WFI, PW) to high-load wastewater effluent.
- High-resolution detection: Select models offer 0.001 NTU minimum display resolution, enabling trace-level monitoring required in biopharmaceutical buffer preparation and clean-in-place (CIP) rinse validation.
- Integrated chromatic compensation algorithm corrects for inherent sample coloration (e.g., humic substances, dye residues), ensuring accurate turbidity values independent of absorbance artifacts—a feature validated per ASTM D6508 Annex A1.
- Ergonomic, streamlined housing with IP65-rated front panel; designed for glove-compatible operation in controlled environments and outdoor utility sites.
- Auto-zero calibration and multi-point standardization routines (using Formazin or StablCal® traceable standards) reduce operator dependency and support audit-ready documentation under FDA 21 CFR Part 11-compliant data management workflows.
Sample Compatibility & Compliance
The WGZ series accommodates standard 25 mm round glass cuvettes (10 mm path length) and accepts both aqueous and low-viscosity organic solvents (e.g., IPA, ethanol/water blends) within specified refractive index limits (1.33–1.36). All models meet ISO 7027:2016 requirements for photometric linearity, stray light rejection (>40 dB), and angular response fidelity. For regulated environments, the WGZ-200A supports GLP/GMP traceability via optional RS232/USB output to LIMS-integrated platforms. Its zero drift specification (±0.5% F.S. at 0.02 NTU) satisfies USP criteria for “low-turbidity verification” in purified water systems. CE marking confirms conformity with EU Electromagnetic Compatibility Directive 2014/30/EU and Low Voltage Directive 2014/35/EU.
Software & Data Management
Equipped with embedded firmware supporting configurable data logging (up to 500 records), time-stamped measurements, and user-defined calibration history archiving. Optional PC software (Truelab TurbiSoft v3.2) enables statistical analysis (mean, SD, %RSD), trend charting, and PDF report generation compliant with ISO/IEC 17025 documentation requirements. Audit trail functionality logs all parameter changes, calibration events, and user logins—fully aligned with FDA 21 CFR Part 11 electronic record integrity provisions when paired with system-level access controls.
Applications
- Drinking water treatment: Real-time monitoring of coagulation/flocculation efficiency and final filter effluent quality (per EPA 180.1).
- Pharmaceutical manufacturing: On-line verification of WFI conductivity loop integrity, sterilizing filter challenge testing, and cleaning validation endpoints.
- Environmental field labs: Rapid assessment of river, lake, and wastewater influent/effluent turbidity during regulatory sampling campaigns.
- Beverage & brewing QC: Quantification of haze formation in beer, wine, and fruit juices during cold stabilization and filtration steps.
- Hospital central sterile supply departments: Validation of washer-disinfector rinse cycles using turbidity-based residual soil detection.
FAQ
What turbidity standards are supported for calibration?
Formazin primary standard (1000 NTU stock), StablCal® polystyrene latex suspensions, and AMCO AEPA secondary standards—all traceable to NIST SRM 2134.
Is temperature compensation automatic?
No—temperature correction is manual input (25 °C reference); users must apply empirical correction factors per ISO 7027 Annex B for non-ambient measurements.
Can the WGZ-200A interface with SCADA or PLC systems?
Yes—via optional 4–20 mA analog output module (part no. WGZ-ANL-420) with isolated current loop and HART protocol compatibility.
What is the service life of the LED light source?
Rated for ≥100,000 hours at nominal drive current; no scheduled replacement required over typical instrument lifecycle (10+ years).
Does the device comply with pharmacopeial requirements for purified water testing?
Yes—validated performance meets USP , EP 2.2.1, and JP 2.07 specifications for turbidity instrumentation used in PQ/PQ-qualified water systems.
