Reactive oxygen species (ROS) disinfection is a widely adopted approach, and ROS analyzers represent a common category of water quality detection instruments. The ROS900 Online ROS Analyzer manufactured by Hangzhou Modi utilizes either induced fluorescence spectroscopy or colorimetric methods for the detection of ROS in aqueous samples. Below is a concise overview of the key information regarding this instrument:

Measurement Modes

Multiple operational modes are available:  

• Timed measurement: The instrument can be programmed to initiate measurements at any user-specified time daily.
• Isochronous measurement: Automatic measurement启动 at fixed time intervals (e.g., every several hours) daily.
• Continuous measurement: Sequential, automated analysis of samples in succession, suitable for product acceptance and relevant technical certification.
• Manual measurement:On-demand activation by the user for on-site experimental comparison, equipment installation, and debugging.

Technical Specifications

Measurement range: 0–2 mg/L;

Measurement accuracy: 5%;

Repeatability: 5%;

Zero drift: 1%;

Span drift: 5%;

Mean Time Between Failures (MTBF): ≥ 720 hours per cycle;

Measurement duration: Minimum 15 minutes; the reaction time is arbitrarily configurable to ensure complete reaction of any water sample. This configurability guarantees accurate detection results for all tested water samples;

Calibration method: Automatic timed calibration or manual calibration. Calibration standard solutions are prepared and set based on the proximity principle relative to the actual ROS content range of the user’s water samples. Since the user’s target water samples typically fall within a limited range, calibrating with standard solutions matching the approximate ROS content of real samples enhances measurement accuracy;

Reagent consumption: 2 mL of each reagent per measurement;

Internal sampling: Equipped with a syringe pump;

Secondary pollution control: All chemical reagents are recycled, with no direct external discharge;

Data transmission: Supports multiple interfaces including 4–20 mA and RS232;

Operating temperature range: +5°C to +40°C;

Dimensions: 590×700×360mm; can be stacked with pretreatment devices on the ground or wall-mounted independently;

Weight: Approximately35kg;

Power supply: (220 ± 20) VAC / (50 ± 0.5) Hz;

Power consumption: Approximately 100 W.