CN-122016742-A - Dissolved oxygen on-line sensor

Abstract

The invention relates to the technical field of sensors, in particular to a dissolved oxygen on-line sensor, which comprises a dissolved oxygen sensor shell, a cleaning device which is arranged in the dissolved oxygen sensor shell and is used for controlling water inlet and outlet, a control processing device which is used for controlling and exciting a light source, and a protection device which is used for protecting a diaphragm, wherein the protection device comprises a light shielding plate and a diaphragm fixing plate which are arranged up and down, and an oxygen sensitive film is arranged in the diaphragm fixing plate.

Inventors

• ZHANG PAN
• CHU YANLONG
• WEI JUNZHENG

Assignees

• 杭州昇辉智能科技有限公司

Dates

Publication Date

20260512

Application Date

20260128

Claims (8)

1. 1. The on-line dissolved oxygen sensor is connected in a cleaning system, the cleaning system comprises a cleaning liquid container, a water outlet container, a controller and a peristaltic pump, the controller is respectively and electrically connected with the on-line dissolved oxygen sensor and the peristaltic pump, the peristaltic pump is connected with the cleaning liquid container through a water inlet hose, the on-line dissolved oxygen sensor is communicated with the peristaltic pump, and the on-line dissolved oxygen sensor is connected with the water outlet container through a water outlet hose.
2. 2. The dissolved oxygen online sensor according to claim 1, wherein the membrane fixing plate is provided with a glass sheet for embedding an oxygen sensitive membrane, a water inlet for water inflow, a water outlet for water outflow and a motor shaft hole I for a motor shaft of the motor to pass through.
3. 3. The dissolved oxygen online sensor of claim 2, wherein the light shielding plate is fan-shaped and is provided with an opening and a motor shaft hole II for a motor shaft to pass through is also arranged on the light shielding plate.
4. 4. A dissolved oxygen online sensor according to claim 3, wherein the cleaning device comprises a motor provided with a motor shaft, a cleaning device sliding guide rail connected to the dissolved oxygen sensor housing, a cleaning device baffle, and a squeegee blade.
5. 5. A dissolved oxygen online sensor according to claim 1 or 3, wherein the control processing device comprises a probe assembly and a main control board assembly.
6. 6. The dissolved oxygen online sensor of claim 5, wherein the probe assembly comprises a reference light source, an excitation light source, an LED drive module, and a photovoltaic processing module.
7. 7. The on-line sensor of claim 6, wherein the LED driving module drives the reference light source to emit red light as a reference signal and the excitation light source to emit blue light to irradiate the oxygen sensitive film to generate red fluorescence.
8. 8. The dissolved oxygen online sensor of claim 5, wherein the main control board assembly comprises a communication module, a power management module, a DAC driving module, an AD acquisition module, and an encoder.

Description

Dissolved oxygen on-line sensor Technical Field The invention relates to the technical field of sensors, in particular to a dissolved oxygen online sensor. Background The dissolved oxygen in water mainly comes from the infiltration of oxygen molecules in the atmosphere and the oxygen released by photosynthesis of plants, the content of the dissolved oxygen in water is one of important indexes for measuring the quality of water and is also one of important factors for purifying the water, the lower the concentration of the dissolved oxygen can cause the deterioration of the water, the lower the concentration of the dissolved oxygen is, the more serious the pollution degree of the water is, the lower the concentration of the dissolved oxygen in the water can cause the growth of fish and shrimp to be blocked or directly dead, and the air bubble disease can occur when the concentration of the dissolved oxygen in the water is too high. Common treatment methods of industrial wastewater at present are an aerobic biological treatment method, an anaerobic biological treatment method or an anaerobic and aerobic combined process treatment, and the methods require the concentration of dissolved oxygen to be within a certain range. The method has the advantages that the method is convenient to use, the concentration of dissolved oxygen in water is extremely important in environmental protection, agriculture, industry and other industries, the dissolved oxygen exists in the water in the form of oxygen molecules, an iodine method, an electrode method and a fluorescent method are common measurement methods, the iodine method is long in test period and cannot be monitored on line in real time, oxygen can be consumed in the electrode method test process, black attachments are easily generated after photolysis of a reference electrode, so that maintenance is difficult to frequently maintain and replace, the fluorescent method is used for detecting the fluorescence intensity (service life) of fluorescent substances to obtain the concentration of the dissolved oxygen in the water, the fluorescent method is long in service life, high in precision, does not release oxygen in response blocks and test processes, can work underwater for a long time, an oxygen sensitive film is a main carrier for fluorescent generation and quenching, the oxygen sensitive film is mainly composed of a shading layer, a reflecting layer, a fluorescent layer and a substrate, the oxygen sensitive film working underwater for a long time is easily attached by algae, a microbe and other impurities, however, the conventional oxygen sensitive film cleaning mode is mainly composed of a hairbrush or an artificial maintenance mode is too strong in the cleaning mode, so that the oxygen sensitive film is required to be frequently cleaned, the fluorescent film cannot be completely cleaned, and the measured is difficult to be in contact with the water sample, and the concentration is not sufficiently required to be completely cleaned. Disclosure of Invention In order to overcome the defects, the invention aims to provide the dissolved oxygen on-line sensor which can alternately use the oxygen sensitive film and is convenient to clean, and meanwhile, the part of the oxygen sensitive film which is not used is cleaned and protected, so that the service life of the sensor is prolonged. The technical scheme for solving the technical problems is as follows: The dissolved oxygen online sensor is connected in a cleaning system, the cleaning system comprises a cleaning liquid container, a water outlet container, a controller and a peristaltic pump, the controller is respectively and electrically connected with the dissolved oxygen online sensor and the peristaltic pump, the peristaltic pump is connected with the cleaning liquid container through a water inlet hose, the dissolved oxygen online sensor is communicated with the peristaltic pump, the dissolved oxygen online sensor is connected with the water outlet container through a water outlet hose, the cleaning system comprises a dissolved oxygen sensor shell, a cleaning device, a light source control and excitation control processing device and a protection device, wherein the cleaning device is arranged in the dissolved oxygen sensor shell and used for controlling water inlet and outlet, the protection device is used for protecting a diaphragm, the protection device comprises a light shielding plate and a diaphragm fixing plate, the light shielding plate is arranged up and down, and an oxygen sensitive film is placed in the diaphragm fixing plate. As an improvement of the invention, the membrane fixing plate is provided with a glass sheet for embedding an oxygen sensitive membrane, a water inlet for water inflow, a water outlet for water outflow and a motor shaft hole I for a motor shaft of the motor to pass through. As a further improvement of the invention, the light shielding plate is fan-shaped and is provided with an op