Shengaohua 6B-50S Portable Platinum-Cobalt Colorimeter

Overview

The Shengaohua 6B-50S Portable Platinum-Cobalt Colorimeter is a field-deployable optical measurement instrument engineered for quantitative assessment of true color in aqueous samples according to the standardized platinum-cobalt (Pt-Co) scale. It operates on the principle of spectrophotometric absorbance comparison at 455 nm—aligned with the spectral sensitivity peak of human visual perception under daylight conditions—and conforms strictly to GB/T 5750.4–2023, the Chinese national standard equivalent to ISO 7887 and ASTM D1209 for color measurement in water and wastewater. Unlike subjective visual comparison methods, the 6B-50S employs a stable cold LED light source and calibrated optical path geometry to deliver objective, operator-independent results traceable to certified Pt-Co reference solutions. Its design emphasizes metrological integrity in non-laboratory environments: zero preheating time, integrated power management, and robust mechanical housing suitable for transport between monitoring sites, treatment facilities, or mobile laboratories.

Key Features

• Touch-enabled backlit LCD interface with intuitive menu navigation and direct concentration readout in Pt-Co degrees
• Cold LED illumination system with >50,000-hour operational lifetime and minimal thermal drift—eliminates warm-up delay and ensures signal stability across ambient temperature fluctuations (10–40 °C)
• No external calibration standards required for routine operation; factory-calibrated against NIST-traceable Pt-Co reference solutions (0–500 degrees), with optional user verification using supplied standard kits
• Integrated rechargeable lithium-ion battery supporting ≥12 hours of continuous measurement cycles per full charge, enabling unattended field deployment
• Onboard time-stamped data logging with automatic timestamping (year/month/day/hour/minute) and 8 GB internal microSD storage—capable of retaining >100,000 measurement records with metadata (sample ID, operator code, location tag)
• Optical path optimized for 10 mm pathlength cuvettes; compatible with both glass and disposable polystyrene cuvettes meeting ISO 3664 optical tolerance specifications

Sample Compatibility & Compliance

The 6B-50S is validated for use with clarified, non-turbid aqueous matrices including drinking water, surface water, effluent streams, process liquors, and rinse waters from industrial cleaning operations. It excludes samples requiring filtration pretreatment per GB/T 5750.4–2023 Clause 6.2 (e.g., those with suspended solids >1 NTU or significant UV-absorbing interferents such as humic acids above 10 mg/L DOC). Instrument compliance extends to environmental monitoring protocols mandated by China’s Ministry of Ecology and Environment (MEE) Technical Guidelines for Water Quality Monitoring (HJ 91.1–2019), and supports GLP-aligned data integrity when used with documented chain-of-custody procedures. While not FDA 21 CFR Part 11–certified out-of-the-box, audit trails generated via exported CSV logs meet basic ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate) for regulated QA/QC workflows.

Software & Data Management

Data export is performed via USB 2.0 interface to standard Windows/macOS platforms. Exported files follow UTF-8 encoded CSV format with fixed column headers: “Timestamp”, “Sample_ID”, “PtCo_Degrees”, “Absorbance_455nm”, “Battery_Voltage”, “Operator_Code”. No proprietary software installation is required; files are directly importable into LIMS platforms, Excel, or statistical analysis tools (e.g., JMP, R). Firmware updates are delivered as signed .bin files via Shengaohua’s secure customer portal—requiring physical USB connection and manual initiation to preserve firmware integrity. Internal memory retains all records during power loss; no volatile RAM-based caching is employed.

Applications

• Regulatory compliance testing for municipal drinking water utilities verifying adherence to GB 5749–2022 maximum allowable color limit (15 degrees Pt-Co)
• Process control in pulp & paper mills monitoring bleach plant effluent color before discharge
• Pharmaceutical facility water-for-injection (WFI) system validation per ChP 2020 General Chapter 0261
• Textile dye-house wastewater characterization prior to advanced oxidation treatment
• Field-based rapid screening of groundwater contamination near landfill leachate plumes
• Educational laboratory instruction in environmental chemistry, focusing on method validation and inter-laboratory precision studies

FAQ

What is the recommended maintenance interval for optical alignment verification?
Annual verification using the included 10-degree and 500-degree Pt-Co reference standards is advised; no user-accessible optical adjustment is provided.
Can the instrument measure APHA or Hazen units interchangeably with Pt-Co degrees?
Yes—Pt-Co degrees, APHA units, and Hazen units are numerically identical per ASTM D1209; the 6B-50S reports results exclusively in Pt-Co degrees as defined in GB/T 5750.4.
Is third-party calibration certification available?
Shengaohua provides optional CNAS-accredited calibration certificates (CNAS-CL01 compliant) upon request, valid for 12 months from issuance.
Does the device support Bluetooth or Wi-Fi connectivity?
No—wireless transmission is intentionally omitted to ensure electromagnetic compatibility in industrial settings and prevent data interception risks in regulated environments.
How is zero drift compensated during extended field use?
The instrument performs automatic dark-current correction at startup and every 2 hours during active operation; zero drift specification (<0.001 AU) refers to absorbance units measured at 455 nm over 8-hour continuous use.