ppb dissolved oxygen meter oxygen electricity principle
Dissolved oxygen electric application spectrum principle, using platinum (Pt) as the negative, Ag/AgCl as the positive, the electrolyte is 0.1M potassium chloride (KCL), and the silicone rubber permeable membrane imported from the United States (BJ) is used as the breathable membrane, which has Silicone rubber and steel gauze, resistant to collision, corrosion, high temperature and non-deformation.
During measurement, a voltage of 0.68V is applied between the anode and the cathode. Oxygen is consumed in the cathode through the permeable membrane, while an equal amount of oxygen is produced in the anode. This dynamic process reaches equilibrium when the oxygen partial pressures on both sides are the same. At this time, the electric current in the electrical room is proportional to the oxygen partial pressure. The meter detects this current and converts it into oxygen concentration through calculation. At the same time, the thermistor detects the temperature of the solution and performs temperature compensation on the oxygen concentration.
The dissolved oxygen battery adopts an innovatively designed compression plug-in structure, which is very convenient for installation and maintenance. The inlet and outlet pipes of the flow cell can be made of stainless steel pipes, with outer diameters of Φ6, Φ8, Φ10, Φ12 and Φ14. Maintenance: Generally, there is no need to replace the flow cell and electronic core, only the breathable membrane needs to be replaced.
working principle:
The dissolved oxygen electricity uses platinum (Pt) as the anode, Ag/AgCl as the anode, the electrolyte is 0.1M potassium chloride (KCl), and a silicone rubber permeable membrane is used as the breathable membrane. When measuring, a voltage of 0.68V is applied between the anode and the cathode. Oxygen is consumed in the cathode through the permeable membrane. The amount of oxygen passing through the membrane is proportional to the dissolved oxygen concentration in the water. Therefore, the limited diffusion current between the electrodes is proportional to the dissolved oxygen concentration in the water. Proportional, the meter detects this electricity and converts it into oxygen concentration through calculation. At the same time, the thermistor detects the temperature of the solution and performs temperature compensation on the oxygen concentration.
The current during air calibration is generally (50~200) nA
The electrical reaction on electricity is:
Yin (Pt) O2+2H2O+4e=4OH-
Yin (Ag) 4Ag+4Cl-=4AgCl+4e
Electrical principle:
The dissolved oxygen meter uses spectral oxygen electricity. It is divided into online type and laboratory type, and also divided into pure water type and common water type.
Oxygen electricity is composed of gold yin and silver yang, where yin is platinum (Pt) and yang is Ag/Agd. The electrodes are immersed in an electrolyte of 0.1 m potassium chloride (KCL), separated by a membrane that is permeable to the gas being measured. The breathable membrane is a silicone rubber permeable membrane imported from the United States (BS), which is protected by a steel mesh and is resistant to collision, corrosion, high temperature and deformation. An auxiliary annular silver shield surrounds the gold cathode, effectively eliminating interference from oxygen in the electrolyte during hypoxic measurements. When oxygen diffuses into the electrolyte solution through the membrane, it is reduced to hydroxide ions at the anode, and silver is oxidized into silver chloride at the anode. At this time, a voltage of 0.68 is added to the anode and anode, and the current generated is at a certain temperature. Directly proportional to the oxygen partial pressure of the medium.
The oxygen current during air calibration is generally 6000nA~13000nA, and its electrical reaction formula is:
Yin (Pt) O2+2H2O+4e=4OH+
Yang (Ag) 4Ag+4Cl=4AgCl+4e
