Dissolved oxygen analyzer supplier

Measurement principle:

The oxygen electrode uses platinum (Pt) as the cathode, Ag/AgCl as the anode, 0.1M (KCl) electrolyte, and a silicone rubber permeable membrane as the breathable membrane. When measuring, a polarization voltage of 0.68V is applied between the anode and cathode. Oxygen is consumed at the cathode through the permeable membrane, and the amount of oxygen passing through the membrane is proportional to the concentration of dissolved oxygen in water. Therefore, the maximum diffusion current between the electrodes is proportional to the concentration of dissolved oxygen in water. The instrument detects this current and converts it into oxygen concentration through calculation. At the same time, the thermistor detects the temperature of the solution and compensates for the temperature of oxygen concentration. The electrode reaction on the electrode is:

Cathode (Pt) O2+2H2O+4e=4OH - Anode (Ag) 4Ag+4Cl -=4AgCl+4e

Technical Specifications:

(1) Measurement range: Dissolved oxygen:

0～200μg/L； Error: ± 0.1 μ g/LF · S (2800C electrode)

0.2～20mg/L； Error: ± 0.1mg/LF · S (2800W electrode)

Temperature: 0-100 ℃; Error: ± 0.8 ℃

(2) Automatic temperature compensation range: 0-100 ℃

(3) Electrode residual signal:<1 ‰

(4) Response time (final value 90%):<60 seconds at 25 ℃;<30 seconds at 35 ℃

(5) Stability: Drift<2% F · S per week

(6) Electronic unit output current error: ± 0.1mA

(7) Electronic unit output current: 0-10mA or 4-20mA

(8) Electronic unit alarm error: ± 0.1% F · S

(9) Two sets of relay contacts: 3A/240VAC; 6A/28VDC or 120VAC9

(10) Power supply: AC: 200-265V/50-60Hz; DC: 24V (DC ordering requires declaration)

(11) Power consumption: ≤ 3W

(12) Electronic unit base weight: approximately 600g

(13) Electrode withstand water sample pressure: 28/028B ≤ 0.8MPa; 028W type ≤ 0.6MPa

(14) Dimensions of electronic unit base: 96 (length) x 96 (width) x 125 (depth) mm

(15) Installation hole size for electronic unit base type: 91 × 91mm

(16) Flow type installation is commonly used for measuring oxygen content below 200 μ g/L. The inlet pipe of the oxygen electrode measuring cell needs to be welded with a hard pipe with an outer diameter of Ø 8, and the outlet pipe needs to be made of a hard pipe or flexible pipe; The joint short tube connected by a hose can be connected to it with a hose with an inner diameter of 8

(17) Working conditions: Environmental temperature: 0-45 ℃; Relative humidity: not exceeding 90%

Functional features:

• Intelligent type: using a single-chip microprocessor to complete oxygen content measurement, temperature measurement, and automatic temperature compensation, etc

• Human computer dialogue interface: menu operation structure, users can operate according to the prompts on the screen

• Networked: capable of remote transmission, monitoring, and control

• Isolation output current: software selects 0-10mA or 4-20mA

• Measurement range: The upper and lower limit parameters correspond to the output current and can be freely set

• The upper and lower limit over limit alarms can be set arbitrarily, and the over limit will flash to indicate the measurement status

• Two sets of relay control, adjustable hysteresis, can be connected to external control devices such as metering pumps and solenoid valves, and can implement automatic dosing and other controls

• Self set password, users can set or modify their own password to prevent unauthorized personnel from entering and causing misoperation; And it can help you retrieve your forgotten instrument password; We also provide users with contact information for technical consultation and after-sales service

• There are multiple calibration methods for electrodes: one point air slope calibration, two-point calibration, known concentration zero point calibration, or manual input of zero current and slope can be used; Measurement error can be modified and other functions

• According to the user's order statement, RS485//RS232 communication interface (communication protocol CD provided) can be provided

• According to the user's order statement, we can provide a 24VDC power supply

• According to the user's project requirements for export to foreign countries, an English version of the declaration can be provided for ordering