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Dissolved Oxygen Electrode (Multiple Options Available)
Water Quality Instruments

Dissolved Oxygen Electrode (Multiple Options Available)

The Dissolved Oxygen Online Analyzer is an intelligent online optical analysis instrument, widely used for continuous monitoring of dissolved oxygen, ...

Key Features

Modular circuit design
Isolated RS485 communication
Supports air calibration
Automatic temperature compensation function
Configurable buzzer and LCD backlight on/off
Selectable language interface (currently supports Chinese and English)

Performance Metrics

Measured Variables Dissolved Oxygen, Saturation
Dimensions Overall: 100mm * 100mm * 150mm, Cutout: 92.5mm*92.5mm
Contact Output 2 independent configurable NO/NC contacts, contact rating AC250V/3A
Temperature Accuracy ±0.5℃
Consult Product

Key Features

Modular circuit design
Isolated transmitter output for reduced interference
Isolated RS485 communication
Capable of measuring dissolved oxygen, saturation, and temperature
Supports air calibration
Automatic temperature compensation function
Configurable high/low alarms with hysteresis
Configurable buzzer and LCD backlight on/off
Selectable language interface (currently supports Chinese and English)
Supports multiple installation methods to suit different field requirements
Intelligent self-diagnosis and fault indication
Data storage and historical record query function

Dissolved Oxygen Electrode (Multiple Options Available)

A dissolved oxygen electrode is a critical sensor for analytical instruments, designed to measure the dissolved oxygen content in solutions. It plays a vital role in water quality monitoring, wastewater treatment, aquaculture, and industrial production processes, providing essential data for environmental assessment and process control.

Dissolved Oxygen Electrode principle and structure diagram

Dissolved Oxygen Electrode Measurement Principle

Dissolved oxygen electrodes operate on two primary principles: the Polarographic Method and the Fluorescence Method. The choice of principle defines the sensor's technology, response time, and maintenance requirements.

Polarographic Method

This type of electrode applies a specific voltage between a cathode and an anode. Dissolved oxygen undergoes a reduction reaction at the cathode, generating a diffusion current proportional to its concentration. Measuring this current determines the dissolved oxygen content.

Fluorescence Method

Based on fluorescence quenching, a fluorescent substance on the sensor is excited by light. When dissolved oxygen contacts the substance, it causes the fluorescence intensity to weaken. The oxygen concentration is calculated based on this change in intensity.

Structure of Polarographic and Fluorescence Dissolved Oxygen Electrodes

Dissolved Oxygen Sensor Structure and Components

The internal structure varies significantly between polarographic and optical fluorescence dissolved oxygen electrodes. Each component is engineered for precise and stable measurement.

Polarographic Electrode Structure

Key components include a precious metal cathode (e.g., platinum), a metal anode (e.g., silver), an electrolyte for ion conduction, and a permeable membrane that allows oxygen to diffuse in while blocking impurities.

Fluorescence Method Electrode Structure

The core is a fluorescent sensing cap. It works with a light source (like an LED) to excite the fluorophore and a photodetector to measure intensity changes. A signal processing circuit then calculates and outputs the final dissolved oxygen value.

Dissolved Oxygen Electrode Types and Classification

By Measurement Principle

Polarographic DO Electrodes: Feature mature, long-established technology with a proven track record in various applications.

Fluorescence Method DO Electrodes: Offer fast response times and simpler maintenance, as they have no membranes or electrolytes to replace regularly.

By Application Scenario

Online Dissolved Oxygen Electrodes: Designed for fixed installation in processes or monitoring stations for continuous, real-time dissolved oxygen monitoring.

Portable Dissolved Oxygen Electrodes: Lightweight and convenient for field measurements, multi-point sampling, and mobile water quality assessment tasks.

Key Features and Performance of DO Electrodes

High Accuracy & Stability

These electrodes provide precise measurements for reliable water quality assessment and process control. They maintain stable performance, though polarographic types require periodic membrane and electrolyte maintenance.

Fast Response & Wide Adaptability

Fluorescence-based sensors respond particularly quickly to concentration changes. The electrodes adapt to various temperature and pH conditions, though extreme environments may require specialized models or compensation.

Dissolved Oxygen Electrode application in wastewater treatment

Primary Application Scenarios for Oxygen Sensors

Dissolved oxygen electrodes are indispensable tools across environmental and industrial sectors where oxygen levels are critical.

Water Quality & Wastewater Treatment

Used in rivers, lakes, oceans, and at discharge points to assess health and pollution. In wastewater plants, they monitor aeration and anaerobic tanks to optimize treatment and microbial activity.

Aquaculture & Industrial Production

Ensure optimal survival conditions for aquatic life by preventing hypoxia. In chemical, pharmaceutical, and food production, they control dissolved oxygen to ensure product quality, safety, and fermentation efficiency.

Advanced Product Features and Specifications

Our dissolved oxygen electrodes and transmitters are equipped with intelligent features for reliable, user-friendly operation in demanding environments.

Measurement Capabilities

Dissolved Oxygen, Saturation, Temperature

Calibration & Compensation

Air Calibration, Automatic Temperature Compensation

Output & Communication

Isolated Transmitter Output, Isolated RS485

Alarms & Interface

Configurable Hi/Lo Alarms, Buzzer, LCD Backlight

System Features

Modular Design, Multi-language, Multi-installation

Intelligence & Data

Self-diagnosis, Data Storage, History Query

Feature Category Specification
Design Modular circuit design
Output Isolated transmitter output for reduced interference
Communication Isolated RS485 communication
Measurement Parameters Dissolved oxygen, saturation, and temperature
Calibration Supports air calibration
Alarms Configurable high/low alarms with hysteresis
Dissolved Oxygen Electrode with transmitter and display unit

Smart Functionality for Reliable Monitoring

The integrated transmitter unit enhances the dissolved oxygen measurement system with robust connectivity and user-centric controls for simplified operation and maintenance.

Features like selectable language interfaces (Chinese/English), configurable buzzer and LCD settings, and multiple installation methods provide flexibility for different field requirements. The intelligent self-diagnosis and data logging functions ensure system reliability and facilitate traceability.

This combination of advanced sensor technology and smart features makes it an ideal solution for continuous dissolved oxygen monitoring in critical water and process applications.

Contact Us

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Downloads

Instruction Manual for Fluorescence - type Dissolved Oxygen Meter.pdf
PDF • 1016.5 KB

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