Ruixin SZ-EYHL2 Chlorine Dioxide Analyzer

Overview

The Ruixin SZ-EYHL2 Chlorine Dioxide Analyzer is a portable, single-channel photometric analyzer engineered for rapid, field-deployable quantification of chlorine dioxide (ClO₂) in aqueous matrices. It operates on the principle of visible-spectrum absorption photometry—measuring analyte-specific absorbance at selected wavelengths within the 380–630 nm range, where ClO₂ exhibits characteristic spectral response in standardized colorimetric reactions (e.g., with DPD or chlorophenol red reagents). Designed to meet routine monitoring requirements in food processing facilities, municipal water distribution points, and environmental field laboratories, the instrument delivers trace-level quantitation (0.05–5.00 mg/L) with high photometric stability (≤0.3% drift over 3 minutes) and calibrated repeatability (≤0.2% transmittance CV). Its compact aluminum housing, integrated rechargeable lithium battery, and dual-power capability (AC 220 V / DC 5 V) ensure operational continuity across lab, plant-floor, and remote sampling sites without dependency on fixed infrastructure.

Key Features

• 4.5-inch high-resolution color TFT touchscreen with full Chinese GUI—enabling intuitive navigation, real-time parameter adjustment, and on-device data annotation.
• Embedded thermal printer for immediate hardcopy generation of test reports—including sample ID, measurement time, calibration curve ID, absorbance/percent transmittance values, and calculated ClO₂ concentration.
• Preloaded multi-point calibration curves optimized for ClO₂ across low-, mid-, and high-range concentrations; user-customizable curve storage supports method validation and matrix-matched calibration.
• Dual-display photometric readout: simultaneous digital display of absorbance (0.000–4.000, resolution 0.001) and transmittance (0.00–100.00%, resolution 0.01%), with photometric accuracy ±2.0% transmittance.
• Automated result logging with timestamped storage (≥1000 records), local recall, and export via USB or RS232 serial interface—compatible with LIMS integration and external data aggregation platforms.
• Robust mechanical architecture: anodized aluminum chassis, IP54-rated enclosure, and shock-absorbing internal optics mount for sustained performance under transport and variable ambient conditions.

Sample Compatibility & Compliance

The SZ-EYHL2 is validated for use with clarified aqueous samples including distilled water, potable drinking water, treated municipal supply water, and surface water (post-filtration). It complies with foundational photometric measurement principles outlined in ISO 7027 (water quality — determination of turbidity) and aligns with analytical workflows referenced in EPA Method 334.0 (chlorine dioxide by amperometric titration or colorimetry) when paired with certified reagent kits. While not a GLP/GMP-certified instrument per se, its audit-ready data logging (with immutable timestamps and operator ID fields), calibration history retention, and non-volatile memory support adherence to internal QA protocols and regulatory documentation requirements under FDA 21 CFR Part 11 (when deployed with controlled access and electronic signature workflows).

Software & Data Management

No proprietary desktop software is required for basic operation; all configuration, calibration, and reporting occur natively on-device. However, the RS232 and USB interfaces enable bidirectional communication with laboratory information management systems (LIMS) or custom SCADA endpoints. Exported data files follow CSV-compliant structure (UTF-8 encoded), containing columns for Sample_ID, DateTime, Absorbance, Transmittance, Curve_ID, Calculated_Conc_mg_L, and Operator_Name. Firmware updates are delivered via USB stick; version history and checksum verification are retained in system logs. The embedded database enforces write-once record integrity—preventing post-measurement edits without explicit audit trail generation.

Applications

• Routine verification of ClO₂ residual levels in food-grade rinse water and CIP (clean-in-place) final rinse stages.
• On-site validation of disinfectant dosing systems in bottled water production lines and dairy processing plants.
• Field-based assessment of ClO₂ stability during distribution in small-scale community water networks.
• Teaching laboratories requiring student-accessible, reagent-based photometric analysis of oxidant residuals.
• Environmental health inspections verifying compliance with national drinking water standards (e.g., China’s GB 5749-2022, WHO Guidelines).

FAQ

Is the SZ-EYHL2 compliant with ISO/IEC 17025 for accredited testing?
No—the instrument itself is not accredited, but it may be used within an ISO/IEC 17025-accredited laboratory as part of a validated method, provided operators demonstrate ongoing performance verification using NIST-traceable standards.
Can the device store custom calibration curves beyond the preloaded set?
Yes—up to 10 user-defined curves can be saved, each associated with unique identifiers, reagent lot numbers, and date stamps.
What reagents are required for ClO₂ measurement?
The analyzer requires commercially available ClO₂-specific colorimetric reagents (e.g., DPD-based or chlorophenol red kits); Ruixin provides compatibility guidance but does not supply reagents.
Does the thermal printer support label paper or only standard receipt rolls?
It accepts 57 mm wide thermal paper rolls only; adhesive-backed labels are not supported due to feed mechanism constraints.
How often must the optical path be cleaned or recalibrated?
Optical cleaning is recommended after every 50 measurements in high-turbidity environments; factory calibration is valid for 12 months, though quarterly verification with standard solutions is advised for regulated applications.