PMDO-700 Series Online PPB Low-Level DO Dissolved Oxygen Analyzer Continuously Monitor Test Pure Water Trace

PMDO-700 Series On-line Trace Dissolved Oxygen Analyzer

1.1 Measurement Principle

The trace dissolved oxygen analyzer is a highly sensitive on-line analytical instrument. Composed of a main unit, sensor, flow cell, and cable, it features high sensitivity, fast response, and user-friendly operation, specifically designed for measuring trace-level (ppb-level) oxygen concentration in gas-water/gas media.

Oxygen measurement adopts the electrochemical polarography method. During measurement, the oxygen sensor undergoes a redox reaction to generate a diffusion current, whose magnitude is proportional to the oxygen concentration in the sample.

1.2 Functional Features

· High-resolution color touch screen: 800×480 resolution, Chinese menu, easy operation

· Real-time curve display: Simultaneous digital and curve presentation for intuitive results
⭐ Multi-channel setting: Supports 4 oxygen sensors for cost efficiency

· Convenient installation & maintenance: Direct fixed mounting (no base needed); rear wiring for reliability
⭐ Plug-in sensor design: Facilitates easy maintenance and replacement

· High precision & sensitivity: Detection limit down to 0.1μg/L or 0.01μg/L; resolution 0.1μg/L or 0.01μg/L
⭐ Fast response: Typically 3 minutes from air to μg/L-level concentration

· Long maintenance cycle & low consumable cost: Electrode maintenance every 6–8 months under normal use
⭐ Large data storage: Holds 1.5 million records with historical curve query function

· 4–20mA current output and RS485 communication

1.3 Typical Application Scenarios

· Trace dissolved oxygen analysis for deoxygenated water in power plants and waste heat boilers

· Trace oxygen monitoring in ultra-pure water processes for semiconductor chip packaging and high-end PCB manufacturing

1.4 Technical Parameters