Ruixin SZ-ZL2 Total Chlorine Analyzer
| Brand | Ruixin |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | SZ-ZL2 |
| Price Range | USD 4,200 – 7,000 (FOB) |
| Function Type | Single-Analyte Dedicated Instrument |
| Sample Type | Single-Sample Format |
| Wavelength Range | 380–630 nm |
| Analysis Time | ≤ 180 seconds |
| Photometric Repeatability | ≤ 0.2% (at 546 nm, using neutral density filters) |
| Optical Channels | 1 |
Overview
The Ruixin SZ-ZL2 Total Chlorine Analyzer is a portable, single-channel photometric analyzer engineered for rapid, field-deployable quantification of total chlorine in aqueous matrices. It operates on the principle of colorimetric analysis based on the DPD (N,N-diethyl-p-phenylenediamine) oxidation method—where free and combined chlorine species react with DPD reagent to form a stable magenta-colored complex measurable at wavelengths between 380 nm and 630 nm, with peak sensitivity near 515–530 nm. Designed for compliance with standard methods including APHA Standard Methods 4500-Cl G and ISO 7393-2, the instrument delivers trace-level accuracy across drinking water, distilled water, surface water, and treated municipal effluent. Its compact aluminum chassis, integrated battery power system, and ruggedized optical path enable reliable operation under variable ambient lighting and temperature conditions typical of on-site environmental monitoring or routine plant-floor QA/QC workflows.
Key Features
- 4.5-inch high-resolution color TFT touchscreen with full Chinese GUI—enabling intuitive menu navigation, real-time spectral preview, and direct parameter configuration without external software.
- Dual-mode power architecture: supports AC 220 V mains, DC 5 V USB input, and built-in rechargeable lithium-ion battery (≥ 8 hours continuous operation).
- Embedded thermal printer for immediate hardcopy reporting—prints calibrated concentration values (mg/L), sample ID, date/time stamp, and method identifier per test.
- Pre-loaded calibration curves for multiple concentration ranges (0.05–0.50 mg/L, 0.50–2.50 mg/L, 2.50–5.00 mg/L), each validated against NIST-traceable chlorine standards.
- Photometric performance: absorbance range 0.000–4.000 AU (resolution 0.001 AU); transmittance range 0.00–100.00% (resolution 0.01%); photometric accuracy ±2.0% T; baseline stability ≤0.3% T over 3 minutes.
- Onboard data management: automatic storage of ≥ 1,000 test records with timestamp, operator ID, and curve selection metadata; recallable via chronological or alphanumeric search.
Sample Compatibility & Compliance
The SZ-ZL2 is validated for use with clarified, low-turbidity aqueous samples (turbidity < 5 NTU). It accommodates standard 10 mm rectangular cuvettes (glass or disposable plastic) and requires no sample pretreatment beyond filtration when particulates exceed 1 µm. The analyzer meets functional requirements outlined in EPA Method 334.0 and conforms to the measurement uncertainty framework specified in ISO/IEC 17025:2017 for routine water quality testing laboratories. While not certified for GLP/GMP environments out-of-the-box, its audit-ready data logging—including immutable timestamps and user authentication fields—supports alignment with FDA 21 CFR Part 11 when deployed with supplementary procedural controls.
Software & Data Management
No PC software installation is required for basic operation. However, optional Ruixin DataLink v2.1 (Windows/macOS compatible) enables bidirectional RS232/USB communication for batch export of CSV-formatted results, remote firmware updates, and customizable report templates compliant with internal QA documentation protocols. All stored measurements include embedded metadata: instrument serial number, calibration verification status, reagent lot number (manually entered), and operator-defined sample identifiers. Exported datasets retain full traceability for regulatory review or third-party validation audits.
Applications
- Routine disinfectant residual monitoring in municipal water distribution systems and bottled water production lines.
- Field verification of chlorine decay kinetics during pipeline flushing or reservoir turnover studies.
- Emergency response screening following natural disasters or infrastructure failures affecting potable water safety.
- Teaching laboratories requiring robust, entry-level instrumentation for analytical chemistry and environmental science curricula.
- Food processing facilities conducting pre-rinse and post-sanitization verification per HACCP Plan Annexes and FSMA Preventive Controls guidelines.
FAQ
Is the SZ-ZL2 compliant with ISO 9001 or ISO/IEC 17025 laboratory accreditation requirements?
The instrument itself is not accredited, but its documented performance specifications, traceable calibration procedures, and secure data logging architecture support integration into ISO/IEC 17025-compliant quality systems when accompanied by validated SOPs and staff training records.
Can the device store custom calibration curves generated in-house?
Yes—up to five user-defined calibration sets may be saved via the touchscreen interface using standard solutions prepared from USP-grade sodium hypochlorite or potassium chlorate reference materials.
What maintenance is required to ensure long-term photometric stability?
Annual verification of wavelength accuracy (using holmium oxide or didymium glass filters) and quarterly cleaning of the cuvette chamber with lint-free optical tissue and isopropanol are recommended per manufacturer service protocol.
Does the thermal printer support barcode label output?
No—the embedded printer outputs only alphanumeric text and numeric concentration values; barcode generation requires external software integration via USB data export.
Is the lithium-ion battery replaceable by the end user?
Battery replacement must be performed by an authorized Ruixin service center to preserve IP65-rated enclosure integrity and optical alignment certification.
