5500 Полярографический датчик растворённого кислорода

Principle of Operation

The 5500 Series dissolved oxygen sensor contains a small chamber with two metal electrodes and an electrolyte, sealed by a selective membrane. Water and dissolved ionic substances cannot pass through this membrane, but oxygen and a certain amount of other gases and hydrophilic substances can. Immersing the dissolved oxygen sensor in water enables the measurement of dissolved oxygen. Due to galvanic action or an applied voltage, a potential difference is created between the electrodes, causing metal ions to enter the solution at the anode, while oxygen passing through the membrane is reduced at the cathode. The resulting current is directly proportional to the transfer rate of dissolved oxygen passing through the membrane into the electrolyte, and this current is proportional to the partial pressure of oxygen in the water sample at a given temperature.

Typical Applications

• The 5500 Series dissolved oxygen sensor is primarily used for dissolved oxygen measurement in municipal wastewater and industrial wastewater treatment plants. Typical applications include

• aeration tanks, aerobic/anaerobic digesters, and final effluent. It is also suitable for dissolved oxygen measurement in various water bodies such as natural water, wastewater, and saline water.

Advantages

• The 5500 Series dissolved oxygen sensor can be used with GLI's D63, D53, D33, and PRO-D3 dissolved oxygen analyzers or transmitters.

• The 5500 Series dissolved oxygen sensor features an integrated replaceable membrane head assembly, making replacement simple and quick. - Since each assembly includes a pre-installed membrane, electrolyte, and electrodes, replacing the assembly replenishes all consumables required by the dissolved oxygen sensor.

• The 5500 Series dissolved oxygen sensor uses polarographic Clark cell technology and consists of a three-electrode system: a gold cathode, a silver anode, and a silver reference electrode. The silver reference electrode is polarized with a constant voltage to provide voltage stabilization, making dissolved oxygen measurement more stable and accurate.

• Built-in self-cleaning system. Self-cleaning options include a compressed air cleaning system, which can be programmed to automatically clean the sensor membrane.

Specifications

• Wetted materials                     Noryl® and 316 stainless steel body, PVC mounting adapter, Viton® O-rings, Teflon® membrane, Noryl® and Ryton® components, and nylon cable clamps and overflow riser

• Electrode material                    Gold cathode, silver anode, and silver reference electrode

• Temp. range                    32~122℉ (0~50℃)

• Temperature compensation                    NTC 30 KO resistor

• Minimum flow rate                    approx. 0.016 ft (0.5 cm) per second

• Maximum pressure                    145 psi (10 bar)

• Measuring range                    0.0~40.00 ppm

• Sensitivity                       ±0.05% of range

• Repeatability                       ±0.5% of range

• Response time (20℃)     approx. 130 seconds to reach 90% of step change

• Membrane thickness                   2 in (50 microns)

• Sensor cable (included)    15 ft (4.6 m) cable, terminated with MS-type quick-disconnect plug (metal or plastic)

• Measuring principle                     Three-electrode polarographic Clark cell technology

• Electrical certifications                     CSA and FM certified; GLI's D53 model can be used in Class I, Div. 2 (Groups A~D) hazardous areas

Source: Public information from the HACH Water Quality website