GDYS-101SC2 Portable Ozone Analyzer by Jilin University Xiaotianshe

Overview

The GDYS-101SC2 Portable Ozone Analyzer is an engineered field-deployable instrument designed for rapid, quantitative determination of dissolved ozone (O₃) concentration in water matrices. It operates on the standardized N,N-diethyl-p-phenylenediamine (DPD) colorimetric principle—where ozone selectively oxidizes DPD to form a stable pink-colored quinoneimine dye, measurable spectrophotometrically at 515 nm. This method is widely referenced in ISO 7393-2:2022 (Water quality — Determination of free chlorine, total chlorine and ozone — Part 2: Method using N,N-diethyl-p-phenylenediamine (DPD)) and aligns with EPA Method 334.0 for residual oxidant quantification. The analyzer integrates a precision LED-based optical system, temperature-compensated photodetector, and embedded microprocessor control to deliver repeatable results under variable ambient conditions—making it suitable for municipal drinking water distribution systems, swimming pool management, bottled water production lines, and ozone-based advanced oxidation process (AOP) validation.

Key Features

• Field-ready portable architecture with integrated rechargeable lithium-ion battery (≥8 hours continuous operation)
• Pre-calibrated optical path optimized for 515 nm absorbance detection with <±0.005 AU photometric repeatability
• Onboard calibration verification using factory-traceable standard solutions (0.50 mg/L and 1.50 mg/L O₃)
• Automatic zero correction via air-blank measurement prior to each analysis cycle
• Intuitive graphical LCD interface with backlight, supporting English-language menu navigation
• Ruggedized ABS housing rated IP65 for dust and water jet resistance during outdoor or wet-environment deployment
• No external PC or software required for basic operation; all calculations performed internally using ASTM D1253-compliant algorithms

Sample Compatibility & Compliance

The GDYS-101SC2 is validated for use with clear, low-turbidity aqueous samples including potable water, treated wastewater effluent, cooling tower water, and ozonated process streams. Samples containing >1 NTU turbidity or interfering oxidants (e.g., chlorine >0.3 mg/L, chloramines, or hydrogen peroxide) require pretreatment per ISO 7393-2 Annex B. The instrument complies with GLP documentation requirements through timestamped result storage (up to 500 records), operator ID entry capability, and audit-ready data export via USB-C interface. While not FDA 21 CFR Part 11 certified out-of-box, its data integrity framework supports GMP-aligned workflows when paired with controlled procedural documentation and periodic instrument verification per manufacturer-recommended intervals (every 90 days or after 200 tests).

Software & Data Management

Data acquisition and reporting are managed via the built-in firmware without dependency on proprietary desktop applications. Each measurement stores date/time stamp, operator ID (alphanumeric, up to 8 characters), measured absorbance value, calculated O₃ concentration (mg/L), and pass/fail status relative to user-defined alert thresholds. Exported .CSV files retain full metadata and are compatible with LIMS platforms, Excel, and statistical process control (SPC) tools. Firmware updates are delivered via signed binary files through the manufacturer’s secure portal—ensuring traceability and version control per IEC 62304 Class B software lifecycle requirements.

Applications

• Real-time monitoring of ozone residual in municipal drinking water disinfection contact tanks
• Verification of ozone dosage efficacy in swimming pool recirculation systems (per CDC Model Aquatic Health Code §6.004)
• In-process control during pharmaceutical water-for-injection (WFI) ozonation cycles (USP )
• Commissioning and routine maintenance of ozone generators in food processing sanitation lines
• Educational laboratory instruction for environmental chemistry and water treatment engineering curricula
• Field verification of ozone decay kinetics in groundwater remediation pilot studies

FAQ

What interferences affect DPD-based ozone measurement?
Chlorine, bromine, and monochloramine produce positive interference; manganese(II) and high nitrite concentrations may cause overestimation. Sample pretreatment with glycine or selective quenching agents is recommended per ISO 7393-2.
Can the GDYS-101SC2 measure ozone in air or gas phase?
No—this instrument is calibrated exclusively for aqueous-phase dissolved ozone. Gas-phase ozone requires UV absorption analyzers (e.g., EPA Method OTM-29) or electrochemical sensors with diffusion membranes.
How often must the optical system be cleaned or recalibrated?
The cuvette chamber should be wiped with lint-free tissue after each use; full optical recalibration is required every 90 days or following exposure to extreme temperature/humidity cycling, using certified reference standards supplied by the manufacturer.
Is the reagent kit compatible with other DPD-based instruments?
The single-use GDYS-branded DPD reagent vials are dimensionally and chemically optimized for this analyzer’s reaction chamber volume and timing sequence; cross-platform use is not validated and may compromise accuracy.
Does the device support regulatory submission-ready reporting?
Yes—when operated under documented SOPs with completed calibration logs and electronic signature capture (via optional external tablet integration), output reports meet ALCOA+ data integrity criteria for environmental compliance submissions.