Shengaohua 6B-50YL(V10) Residual Chlorine Analyzer

Overview

The Shengaohua 6B-50YL(V10) Residual Chlorine Analyzer is a dedicated benchtop spectrophotometric instrument engineered for precise, rapid quantification of free residual chlorine in potable water, wastewater effluents, swimming pool systems, and process water streams. It operates on the internationally standardized N,N-diethyl-p-phenylenediamine (DPD) colorimetric method—designated in ASTM D1253, ISO 7393-2, and EPA Method 334.1—where free chlorine oxidizes DPD reagent to form a stable pink-colored complex proportional to concentration. Absorbance is measured at 515 nm using a cold LED light source coupled with a narrow-band interference filter, eliminating thermal drift and ensuring long-term photometric stability. The analyzer delivers laboratory-grade reproducibility without requiring external calibration standards for routine use, making it suitable for QC laboratories, municipal water utilities, and third-party environmental testing facilities operating under GLP or ISO/IEC 17025 frameworks.

Key Features

• High-stability cold LED optical system with 100,000-hour rated lifetime and <±0.5 nm spectral bandwidth for consistent absorbance measurement across extended operational cycles.
• Large backlit monochrome LCD display with intuitive Chinese-language menu navigation—designed for ease of use in mixed-language lab environments without compromising technical clarity.
• Onboard memory supporting up to five user-defined, editable calibration curves; enables method adaptation for varying matrix interferences (e.g., high turbidity or combined chlorine presence).
• Measurement resolution of 0.001 mg/L within the 0–3 mg/L linear range, with demonstrated accuracy and repeatability both ≤ ±5% (as verified per ISO 8467:2021 validation guidelines).
• Full data management architecture: stores up to 5 million timestamped results locally; supports chronological recall, batch filtering, and export-ready formatting via optional RS232 or USB interface.
• Rugged industrial-grade housing compliant with IP54 ingress protection; designed for continuous operation in humid or chemically exposed laboratory and field-deployable settings.

Sample Compatibility & Compliance

The 6B-50YL(V10) is validated for use with clarified aqueous samples meeting standard pretreatment criteria: turbidity < 5 NTU, pH 6.2–7.8, and absence of strong oxidants other than free chlorine (e.g., ozone or permanganate). It complies with key regulatory and methodological references including ASTM D1253-22 (Standard Test Method for Free Chlorine in Water), ISO 7393-2:2022 (Water Quality – Determination of Free and Total Chlorine – Part 2: Colorimetric Method), and Chinese Environmental Monitoring Standard HJ 586–2010. While not FDA 21 CFR Part 11–certified out-of-the-box, audit trails, user access logs, and electronic signature capability can be implemented via firmware update to support GMP-aligned documentation requirements in pharmaceutical or beverage manufacturing QA/QC labs.

Software & Data Management

Instrument firmware includes embedded data logging with automatic time/date stamping, sample ID tagging, and operator code assignment. Stored records retain full metadata: measurement wavelength, curve ID used, raw absorbance value, calculated concentration, and environmental temperature at time of analysis. Data export is supported via ASCII-formatted text files compatible with LIMS integration (e.g., Thermo Fisher SampleManager, LabVantage). Optional thermal printer module provides hard-copy output compliant with internal QA record retention policies. All firmware updates are delivered via secure USB drive—no cloud dependency—to maintain data sovereignty and network isolation in regulated environments.

Applications

• Drinking water treatment plants: verification of disinfectant residual prior to distribution.
• Municipal wastewater facilities: monitoring chlorine contact tank effluent compliance with discharge permits (e.g., NPDES).
• Swimming pool and spa maintenance: daily free chlorine verification per CDC Model Aquatic Health Code (MAHC) thresholds.
• Pharmaceutical water systems (PW, WFI): periodic residual chlorine screening during sanitization cycle validation.
• Academic and research laboratories: teaching DPD methodology and conducting comparative disinfection kinetics studies.
• Food & beverage processing: rinse water and CIP solution monitoring in dairy, brewing, and juice production lines.

FAQ

Does the 6B-50YL(V10) measure total chlorine or only free residual chlorine?
It is configured exclusively for free residual chlorine quantification per DPD Method 1. Total chlorine requires DPD Method 3 (with potassium iodide addition), which is not supported by this model’s fixed reagent protocol.
Can calibration curves be imported from external sources such as Excel spreadsheets?
No—calibration curves must be generated in situ using certified reference standards and manually entered or optimized via the onboard curve editor. This ensures traceability to NIST-traceable chlorine standards.
Is the instrument suitable for field use outside the laboratory?
While portable in footprint (280 × 220 × 120 mm), it requires stable AC power and ambient temperatures between 10–40 °C; it is not battery-operated or shock-rated for mobile deployment.
What reagents are required, and are they supplied with the instrument?
DPD powder tablets (free chlorine-specific) and buffer tablets are required per test; these are consumables and sold separately. Shengaohua provides reagent compatibility specifications but does not bundle them with hardware.
How is instrument performance verified during routine operation?
Users perform daily blank verification and weekly standard check using 0.5 mg/L and 2.0 mg/L NIST-traceable chlorine standards; deviation logs are retained in the internal audit trail for internal quality review.