Yoke SZ-182 Touchscreen Colorimeter (Functional Model)

Overview

The Yoke SZ-182 Touchscreen Colorimeter (Functional Model) is a dedicated benchtop optical measurement instrument engineered for precise, repeatable colorimetric analysis of liquid samples—primarily in water quality monitoring, environmental laboratories, municipal wastewater treatment facilities, and industrial process control environments. It operates on the internationally recognized Platinum-Cobalt (Pt-Co) standard colorimetric method, as codified in GB 11903–1989, enabling quantitative determination of apparent color in water and aqueous solutions expressed in Platinum-Cobalt Units (PCU). Unlike spectrophotometers or full-spectrum analyzers, the SZ-182 employs a fixed-wavelength optical architecture optimized specifically for the Pt-Co scale, delivering high reproducibility in routine color assessment without spectral complexity. Its optical path integrates a narrow-band interference filter system coupled with a stabilized cold LED light source—designed to minimize thermal drift and photometric instability over extended operational cycles.

Key Features

• 5.6-inch high-resolution color touchscreen with intuitive graphical user interface (GUI), supporting multi-point touch navigation and context-sensitive soft-key operation.
• Dedicated Pt-Co color measurement channel calibrated across 0–500 PCU range, traceable to national reference standards per GB 11903–1989.
• High-stability optical subsystem featuring long-life cold LED illumination (rated >100,000 hours) and precision interference filters for consistent photometric response.
• ARM9-based embedded processing architecture with 512 MB internal memory, enabling rapid data acquisition, real-time calculation, and robust multi-tasking performance.
• Built-in thermal printer for immediate hardcopy output of current measurements, historical records, and calibration logs—supporting audit-ready documentation.
• Comprehensive data management: stores ≥5,000 test records; includes 5 factory-loaded calibration curves and supports up to 195 user-expandable curves.
• User-customizable calibration functionality: allows segmented K-coefficient adjustment and manual curve construction for non-standard or application-specific matrices.
• Native compatibility with Lab-YY pre-formulated reagent kits, reducing operator variability and minimizing procedural steps while maintaining analytical integrity.
• Dual communication interfaces: USB 2.0 host port for flash drive data export and RS-232 serial port for integration into LIMS or SCADA systems.

Sample Compatibility & Compliance

The SZ-182 is validated for use with clarified, filtered, or centrifuged aqueous samples meeting standard pretreatment requirements outlined in GB 11903–1989—including potable water, surface water, treated effluent, and industrial process streams. It is not intended for highly turbid, emulsified, or strongly absorbing matrices without prior dilution or filtration. While not certified to ISO/IEC 17025 or accredited under GLP/GMP frameworks out-of-the-box, its design adheres to fundamental metrological principles required for regulatory-compliant water testing. Instrument performance verification may be conducted using NIST-traceable Pt-Co standard solutions (e.g., 5, 10, 30, 100, 300, and 500 PCU references). The device supports basic audit trail functions via timestamped data logging and printable reports—serving as foundational documentation for internal QA/QC procedures and preliminary FDA 21 CFR Part 11 readiness when paired with controlled access protocols.

Software & Data Management

The embedded firmware provides native support for structured data capture, including sample ID, operator ID, date/time stamp, measurement value, unit, and associated calibration curve identifier. All stored records are retained in non-volatile memory and can be exported in CSV format via USB mass storage mode. No proprietary desktop software is required for basic operation; however, optional Windows-compatible configuration utilities (distributed separately) enable advanced curve editing, batch report generation, and firmware updates. Data security follows industry-standard practices: no cloud connectivity, local-only storage, and password-protected administrator mode for calibration and system settings modification. Exported files maintain full traceability and are compatible with common laboratory informatics platforms for downstream statistical analysis or regulatory submission.

Applications

• Regulatory compliance testing for drinking water color per GB 5749–2022 and environmental discharge standards (e.g., GB 8978–1996).
• Process monitoring in municipal wastewater treatment plants during coagulation/flocculation and final effluent polishing stages.
• Quality assurance in beverage production, pharmaceutical water systems (PW/WFI pre-screening), and textile dye-house effluent characterization.
• Educational laboratories requiring a cost-effective, robust platform for teaching standardized colorimetric methodology.
• Field-deployable use in mobile labs or remote stations where ruggedness, low power consumption, and minimal maintenance are critical.

FAQ

Does the SZ-182 comply with international standards such as ISO 7887 or ASTM D1209?

The instrument implements the Pt-Co method aligned with GB 11903–1989, which is technically equivalent to ISO 7887-2 and ASTM D1209. However, formal conformance certification requires third-party verification against those standards.
Can the device measure parameters other than color (e.g., COD or turbidity)?

While marketed with multi-parameter capability in some configurations, the SZ-182 functional model described here is optically configured exclusively for Pt-Co color measurement. Other parameters require separate optical channels or dedicated instruments.
Is the built-in thermal printer field-replaceable?

Yes—the thermal print head and paper roll mechanism are modular and serviceable using standard replacement kits available from Yoke authorized distributors.
What is the recommended calibration frequency?

Daily verification with a mid-range Pt-Co standard (e.g., 100 PCU) is advised for routine QC; full two-point calibration (zero and span) should be performed at least once per shift in high-throughput environments.
Does the instrument support network connectivity or Ethernet?

No—network connectivity is limited to USB and RS-232 interfaces. Integration with Ethernet-based infrastructure requires an external serial-to-Ethernet converter or gateway device.