Ruixin SZ-SD2 Colorimeter
| Brand | Ruixin |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Region of Manufacture | Domestic (China) |
| Model | SZ-SD2 |
| Price Range | USD 4,200 – 7,000 |
| Functionality | Single-parameter Quantitative Analysis |
| Sample Type | Dedicated to Aqueous Samples |
| Wavelength Range | 380–630 nm |
| Measurement Time | ≤ 180 s |
| Photometric Repeatability | ≤ 0.2% |
| Optical Channels | 1 |
Overview
The Ruixin SZ-SD2 Colorimeter is a portable, single-channel photometric analyzer engineered for rapid, field-deployable quantification of color intensity in water samples according to the Platinum-Cobalt (PCU) scale. It operates on the principle of visible-light absorbance spectroscopy within the 380–630 nm spectral window, where chromophoric impurities—such as humic substances, iron complexes, or organic degradation products—exhibit characteristic absorption profiles. Unlike broad-spectrum spectrophotometers, the SZ-SD2 employs fixed-wavelength optical detection optimized for compliance with ISO 7887:2011 (Water quality — Determination of colour) and APHA Standard Methods 2120B (Platinum-Cobalt Scale). Its compact aluminum chassis, integrated rechargeable lithium battery, and ruggedized touchscreen interface enable reliable operation in ambient outdoor conditions—making it suitable for on-site monitoring by municipal water utilities, food processing QA teams, and environmental field technicians.
Key Features
- 4.5-inch high-resolution TFT color touchscreen with intuitive Chinese/English bilingual UI and stylus-compatible input for direct annotation of sample IDs and test notes.
- Dual photometric display modes: Absorbance (0.000–4.000 AU, resolution 0.001) and Transmittance (0.00–100.00%, resolution 0.01%), both traceable to NIST-traceable calibration standards.
- Preloaded multi-point calibration curves for PCU quantification across five concentration ranges (5–200 PCU), supporting linear and polynomial regression fitting per ISO/IEC 17025 requirements.
- Embedded thermal printer for immediate hard-copy reporting with timestamp, operator ID, calibration status, and measurement uncertainty indicators.
- Real-time data logging with internal memory capacity for ≥500 test records, including spectral baseline, blank correction, and auto-zero compensation history.
- Triple power flexibility: AC 220 V mains, DC 5 V external adapter, or built-in Li-ion battery (≥8 hours continuous operation at 25°C).
Sample Compatibility & Compliance
The SZ-SD2 is validated for use with clarified aqueous matrices exhibiting low turbidity (<5 NTU) and minimal suspended solids—specifically potable water, groundwater, surface water, and process rinse waters in food manufacturing facilities. It is not intended for highly colored, viscous, or particulate-laden samples without prior filtration (0.45 µm membrane) or centrifugation. Instrument performance adheres to ASTM D1209 (Standard Test Method for Color of Clear Liquids) and supports GLP-compliant workflows through audit-ready data export logs. All firmware and calibration protocols are documented per ISO/IEC 17025 Clause 7.7 (Uncertainty of Measurement) and align with FDA 21 CFR Part 11 requirements for electronic record integrity when used with optional password-protected user roles.
Software & Data Management
Data exchange is supported via RS-232 serial and USB 2.0 interfaces, enabling bidirectional communication with LIMS platforms or custom SCADA systems using ASCII-based command protocols. The device exports CSV-formatted reports containing raw absorbance values, calculated PCU concentrations, instrument serial number, calibration date, and operator metadata. Firmware updates are performed via USB drive with SHA-256 signature verification to ensure code authenticity. No cloud connectivity or proprietary software installation is required—data retrieval is fully compatible with Excel, LabVIEW, and Python pandas workflows.
Applications
- Routine color surveillance in municipal drinking water distribution networks to verify compliance with WHO Guidelines for Drinking-water Quality (≤15 PCU).
- Process control in beverage production (e.g., bottled water, fruit juice dilution lines) where color deviation indicates oxidation or microbial spoilage.
- QA/QC verification of activated carbon filtration efficiency in food-grade water treatment systems.
- Field validation of pretreatment efficacy prior to UV disinfection or reverse osmosis stages.
- Educational use in university environmental science labs for method validation exercises aligned with APHA Standard Methods training modules.
FAQ
What is the certified measurement range for PCU quantification?
The SZ-SD2 provides quantitative results from 5 to 200 PCU, with linearity verified per ISO 8466-1 across this interval using certified platinum-cobalt reference standards.
Does the instrument support third-party calibration verification?
Yes—users may load custom calibration files via USB; all calibration events are time-stamped and stored in non-volatile memory with read-only access for audit purposes.
Is the thermal printer compatible with standard label stock?
It accepts 57 mm wide thermal paper rolls only; no adhesive-backed labels or ribbon cartridges are supported.
How is photometric stability maintained during extended field use?
The optical path incorporates temperature-compensated LED sources and solid-state photodiodes, with automatic warm-up drift correction executed every 180 seconds during standby mode.
Can the device be operated in humid or dusty environments?
It meets IP54 ingress protection rating—suitable for rain-exposed outdoor use but not submersion or high-pressure washdown scenarios.
