Online Dissolved Oxygen Analyzer HM-SDO1

Product Overview

Dissolved oxygen analyzer is a commonly used instrument equipment, mainly used to measure dissolved oxygen in water, widely used in industries, agriculture, scientific research, environmental protection and other fields.

Measuring principle

The dissolved oxygen value of a dissolved oxygen analyzer in water depends on temperature, pressure, and the salinity of the dissolved water. The sensor part of the 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. When a polarization voltage of 0.6-0.8V is applied to the electrode of the dissolved oxygen analyzer, oxygen diffuses through the membrane, the cathode releases electrons, the anode accepts electrons, and a current is generated. The entire reaction process is as follows: anode Ag+Cl → AgCl+2e -, cathode O2+2H2O+4e → 4OH -. According to Faraday's law, the current flowing through the 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.

Standard liquid configuration

Preparation of anaerobic water

At room temperature of 20 ℃, place 250ml of distilled water in a beaker, add about 50mg of anhydrous sodium sulfite (to fully saturate it), and add an appropriate amount of cobalt chloride (CoCl2) as a catalyst. Stir evenly before use.

DO calibration

Place the DO electrode in anaerobic water, enter the low point calibration menu (calibrated at the factory), wait for stability, and press ENTER to confirm storage.

Place the DO electrode in the air and wait for it to stabilize before entering the air for calibration. Press ENTER to confirm storage.

Alternatively, enter high point calibration, place the DO electrode into a known solution, wait for stability, input the dissolved oxygen value of this liquid, and press ENTER to confirm storage. (Choose one of 2 or 3 for calibration)

Display mode: LCD liquid crystal display

Instrument features

Dot matrix LCD screen display

Intelligent menu operation

Multiple automatic calibration functions

Multiple signal output modes

Manual and automatic temperature compensation

Three sets of relay control switches

High limit, low limit, hysteresis control

Display dissolved oxygen, temperature, status, etc. on the same interface

Technical Specifications

Product Name: Online Dissolved Oxygen Analyzer

Product Model:

Measurement range: Dissolved oxygen: 0-20.0mg/L Temperature: 0-50 ℃ (depending on the electrode)

Measurement accuracy: Dissolved oxygen: ± 1% F.S Temperature: ± 0.3 ℃

Temperature compensation: automatic or manual

Resolution: Dissolved oxygen: 0.01mg/L Temperature: 0.1 ℃

Stability: Drift 2% F.S per week at room temperature and constant pressure

Relay: Three sets of 5A 240VAC/5A 28VDC or 120VAC

Power supply: 85-265VAC or 9-36VDC, power: ≤ 3W

Current output: standard configuration includes 2 channels of 4-20mA

Communication output: Standard RS485 Modbus RTU

Dimensions: 215 * 125 * 80mm

Hole size:-

Protection level: IP65

Installation method: Wall mounted

Instrument weight: 1.5kg

Environmental temperature: -10~60 ℃; Relative humidity: ≤ 90%; There is no strong magnetic field interference around except for the Earth's magnetic field

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