product overview

Dissolved oxygen analyzer is a commonly used instrument and equipment, mainly used to measure the dissolved oxygen value in water, widely used in industries, agriculture, scientific research, environmental protection and other fields. The film coated dissolved oxygen meter adopts the principle of permeation measurement, which reflects sensitively and measures stably and reliably.The instrument adopts LCD display for measuring and displaying DO value and medium temperature value, with analog signal and digital signal output as well as control function.

Working principle

The dissolved oxygen value in water depends on temperature, pressure, and the salinity of the dissolved water. The sensor part of the coated electrode dissolved oxygen analyzer consists of a gold electrode (cathode) and a silver electrode (anode), as well as potassium chloride or potassium hydroxide electrolyte. Oxygen diffuses into the electrolyte through the membrane and forms a measurement circuit with the gold and silver electrodes. The current flowing through the coated electrode of the dissolved oxygen analyzer is proportional to the oxygen partial pressure, and there is a linear relationship between the current and oxygen concentration under constant temperature.

technical parameter

Test performance: Measurement range: 0-20mg/L Indication error: ± 0.3 mg/L Resolution: 0.01 mg/L Calibration: two-point calibration, can be calibrated on site Temperature compensation: NTC automatic temperature compensation Display: LCD liquid crystal display Signal output: Analog output: 4-20mA (four wire system), maximum load 750W Switching quantity: 2 sets of relays with a capacity of AC230V/5A Digital interface: RS485 (Modbus protocol) Power supply: AC220V ± 10%, 50Hz (optional DC24V) Physical performance: Material: Transmitter: ABS; Electrode: Polyester, epoxy resin Connection process: 3/4 NPT external thread Installation methods: bracket insertion, circulation, insertion Cable length: 10 meters (can be extended up to 20 meters) Environmental performance: Protection level: transmitter: IP65; Electrode: IP68 Working temperature: transmitter: -20~55 ℃; Electrode: 0-60 ℃, 80 ℃, 110 ℃ Environmental humidity: Relative humidity ≤ 85% Working pressure: normal temperature ≤ 0.6MPa, high temperature ≤ 0.4MPa.

Coated electrode dissolved oxygen transmitter Coated electrode dissolved oxygen sensor

Product Features

The measurement principle of polarography is sensitive, stable, and reliable;

Special film coating technology eliminates impurities and interference, and is resistant to pollution;

Intelligent module self diagnostic technology, error alarm display;

Long term stable and reliable use, easy maintenance;

High precision automatic temperature compensation system;

4-20mA output, relay high and low alarm control output, RS485 communication output and other variable outputs, system intelligent control;

LCD display, with a beautiful and exquisite appearance;

Various installation methods and easy maintenance.

application area

Wastewater treatment: Measurement and regulation of oxygen content in activated sludge tanks to achieve high efficiency in biodegradation processes.

Hydrological monitoring: measurement of oxygen content in rivers, lakes, and oceans to control water quality.

Aquaculture: Monitoring and regulating oxygen content in water tanks to maintain optimal ecological and growth conditions.

Product manual:Instructions for Coated Electrode Dissolved Oxygen Analyzer（ Online download)