Aquatic intelligent dissolved oxygen sensor

one,product description

Intelligent dissolved oxygen sensor usesRS485 communication interface and standard Modbus protocol. Using the fluorescence detection principle,there is no need to replace the dissolved oxygen membrane and electrolyte,the polarization time is short,the response time is fast,and the measurement is almost unaffected by dirt and flow rate. Corrosion-resistant shell,built-in PT1000 temperature sensor and compensation algorithm. The sensor has the advantages of maintenance-free,high precision and simple calibration. Widely used in surface water monitoring,industrial wastewater and municipal sewage monitoring,wastewater treatment,aquaculture,biotechnology,drug development,food and beverage,chemical manufacturing and other industries.

two,working principle

Dissolved oxygen is an indicator of the molecular oxygen content dissolved in water. Intelligent dissolved oxygen sensorIt is designed based on the quenching principle of excited fluorescence by specific substances in physics. When the excitation light shines on the fluorescent substance on the surface of the fluorescent membrane head,the fluorescent substance is excited and emits fluorescence. The extinguishing time of the fluorescence is affected by the concentration of oxygen molecules on the surface of the fluorescent membrane head. The concentration of oxygen molecules can be calculated by detecting the phase difference between fluorescence and excitation light and comparing it with the internal calibration curve,and outputs the final value after temperature and salinity compensation.useThe 465nm light source is used as excitation light to illuminate the sensitive diaphragm to produce 620nm fluorescence. The fluorescence quenching effect occurs under the action of dissolved oxygen in water,and the degree of quenching is linearly related to the dissolved oxygen concentration.

three,Features

lNo electrolyte required,no polarization

lNo need to consume oxygen and not affected by flow rate

lBuilt-in temperature sensor,automatic temperature compensation

lBuilt-in salinity compensation,flexible parameter setting

lNot interfered by chemical substances such as sulfide

lSmall drift,fast response,and more accurate measurement

lservice life and lower cost of use

lThe fluorescent film head is easy to replace and simple to maintain.

lRS-485 interface,Modbus/RTU protocol

lLow power consumption and anti-interference design

Four,Technical Parameters

five,Dimensions

Note:The sensor connector isM16-5 core waterproof connector male。

six,Sensor installation

The sensor should be immersed and fixedly installed below the liquid level. During installation and use,avoid collision or scratching the surface of the fluorescent membrane head. The fluorescent membrane head part should avoid being attached by underwater sediments. Rubber protective cover should be removed during use.

seven,Electrical connections

The cable is4-core twisted pair shielded wire,wire sequence definition:

lred line—Power cord (12~24VDC)

lblack line—Ground wire (GND)

lblue line—485A

lwhite line—485B

The wiring sequence should be carefully checked before powering on to avoid unnecessary losses caused by wiring errors.

Wiring instructions: Considering that cables are immersed in water (inc seawater) or exposed to the air for a time,all wiring locations are required to be waterproofed,and user cables should have certain anti-corrosion capabilities.

eight,application market

wideIt is widely used in surface water monitoring,industrial wastewater and municipal sewage monitoring,wastewater treatment,aquaculture,biotechnology,drug development,food and beverage,chemical manufacturing and other industries.