Data Acquisition Terminal Using Two Methods for Dissolved Oxygen Measurement

The dissolved oxygen data acquisition terminal is a device used to measure and monitor the dissolved oxygen concentration in water bodies. It is typically a portable or fixed installation device, equipped with a dissolved oxygen sensor and associated electronics. The main function of the dissolved oxygen sensing terminal is to measure the dissolved oxygen concentration in water bodies in real time and transmit the data to the data acquisition system or monitoring platform for recording and analysis. Some dissolved oxygen sensing terminals can also provide data visualization, alarm functions and remote monitoring features.

Specification
Working Principle
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Specification

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DOP-6141 Dissolved Oxygen Data Acquisition Terminal
DOF-6310 Fluorescence Dissolved Oxygen Data Acquisition Terminal

DOP6141 is an environmental oxygen data acquisition terminal, which adopts high-performance oxygen permeable membrane, and the data responds to the change of dissolved oxygen in water in real time.

The product has a series of patented technologies such as split type, wireless transmission, no on·site APP calibration, no secondary wiring and so on. As an ecological instrument of the internet of Things, it is directly integrated into LCDCS and other systems, and can realize wired, wireless and cloud transmission of wired, wireless, network and optical terminals with the help of more internet of Things modules.

A DOP-6141 dissolved oxygen data acquisition terminal

Features

No on-site APP calibration.
No secondary wiring, communication cable once wiring permanent use.
Wide power supply range, ignoring the influence of circuit resistance voltage drop.
Micro encapsulation pass-through technology, the electrical meter and communication are embedded into the sensor connector.
RS485 digital communication, Modbus RTU standard protocol.
Compatible with 4-20mA system (RS485/4–20mA + WF module, setting the corresponding information of digital quantity and mA accurately by APP).
Separate detachable structure, only replace the chemical acquisition unit.
Wireless transmission technology, no metal exposed, no corrosion aging, no water vapor leakage effect.
APP calibration, no difference type replacement, easy to use and replace, without professional knowledge.
The product has the traceability of physical examination, history, lifespan, obstacle, and so on.

Main Technical Data

Table 1: DOP-6141 Dissolved Oxygen Data Acquisition Terminal Main Technical Data
Measurement Range	0–20 mg/L
Resolution	0.01 mg/L
Accuracy	±0.3 mg/L
Measurement principle	Polarography
Size	φ45 mm × 220 mm
Installation Screw	NPT3/4 front, NPT3/4 end
Temperature Compensation	0–50.0 °C, accuracy: ±0.5 °C
Pressure	0.2 MPa
Protection Level	IP68
Power Supply	DC (9–28)V, Consumption: ≤ 2W
Communication	RS485, MODBUS RTU
Medium Temperature	5–50 °C
Storage environment	Temp.: -10 to +60°C, relative humidity: 95% (non condensation)
Cable Length	Conventional 10 m, customizable by appointment

Application

Widely used in electric power, petrochemical, industrial fields, chemical process,industrial water treatment, environmental monitoring, sewage treatment, aquaculture and other occasions involving online analysis, to meet the technical applications in various fields.

Fluorescence quenching principle, no need for internal filling, no oxygen consumption, and easy maintenance.
The service life of the fluorescent membrane cap is more than one year (under ideal conditions).
Original altitude, atmospheric oxygen partial pressure, temperature compensation, to improve the authenticity of the data.
There is almost no flow rate requirement, which can meet most usage measurement scenarios. RS485 digital port directly sends Modbus RTU communication data.
As the front terminal of any industrial computer, controller, PLC, and communication protocol module.
9–28V wide power supply DC power supply, suitable for a wide range of application scenarios.
Data acquisition terminal sends data directly, with long transmission distance, anti-interference, and no distortion.
Provides more solutions for problems and product ecological support.
Good electromagnetic compatibility (EMC) design, calmly deals with the complex electromagnetic environment of the industrial site.

A DOF-6310 fluorescence dissolved oxygen data acquisition terminal

Main Technical Data

Table 2: DOF-6310 Fluorescence Dissolved Oxygen Data Acquisition Terminal Main Technical Features
Measuring Method	Fluorescence Method
Measurement Range	0–20 mg/L
Accuracy	±0.3 mg/L
Resolution	0.01 mg/L
Response Time	90s
Repeatability	5% RS
Temperature Compensation	0–60.0 °C, Accuracy: ±0.5 °C
Air Pressure Compensation	300–1100 hPa
Stand Pressure	0.3 Mpa
Communication	RS485 MODBUS-RTU standard protocol
Power	DC (9–28)V
Power Consumption	< 2W
Operational Environment	Temperature: (0–50) °C
Storage Environment	Temperature: (-10 to +60) °C Humidity: ≤ 95% RH (None condensation)
Installation	Submerged
Protection Level	IP68
Weight	1.5 kg (with 10 m cable)

Working Principle

DOP-6141: Based on electrochemical principles, it uses an electrochemical sensor with an oxygen permeable membrane. The sensor's electrodes are in contact with the water sample, and oxygen permeates the membrane, allowing the oxygen in the water sample to undergo an oxygen reduction reaction with the working electrode. The current generated by this reaction is proportional to the concentration of dissolved oxygen in the water sample. By comparing the relationship between the measured current and the known dissolved oxygen concentrations, the concentration of dissolved oxygen in the water sample can be determined.

DOF-6310: It is based on the principle of quenching of active fluorescence by specific substances. Typically, a LED or laser diode excites a fluorescent membrane metal porphyrin complex coating to produce fluorescence. The presence of dissolved oxygen reduces the intensity and lifetime of fluorescence through an energy transfer process. By measuring the change in fluorescence intensity decay or lifetime, the dissolved oxygen content in water can be accurately calculated.

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