A Dissolved Oxygen Calibration System

Abstract

The invention discloses a calibration system for dissolved oxygen. The structure of the invention is scientific and reasonable. The air component is connected to the pipeline, the air control component is connected to the detection component, the detection component is connected to the drainage component, and the water control component includes a handwheel valve, a first electric valve and a check valve, which are safe and convenient to use. The calibration system connects each electric valve and dissolved oxygen sensor together to form the entire pipeline system, and the controller controls the closing state of each electric valve to realize the on-off of the water circuit and the gas circuit, so that the dissolved oxygen sensor in the water is used to measure the dissolved oxygen in the water. Content detection, and the use of gas circuit to realize the automatic calibration and testing function of the dissolved oxygen sensor can effectively avoid the cumbersome process of dismantling the dissolved oxygen sensor and sending it back to the laboratory in the past.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a calibration system for dissolved oxygen. Background technique [0002] The photochemical dissolved oxygen sensor based on the principle of fluorescence quenching has strong anti-interference ability, high measurement accuracy, good repeatability and stability, and is suitable for detecting and monitoring the concentration of dissolved oxygen in various water bodies. , at present, the fluorescence method ultra-low dissolved oxygen sensor is used more and more in semiconductor, boiler and other fields. On the fluorescent substance, the fluorescent substance is immediately excited by the blue light. When the excited substance returns to its original state, it will emit red light. This red light will be measured by the photodiode in the sensor. The time from being excited to returning to its original state after emitting red light, so that the content of dissolved...

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Problems solved by technology

[0002] The photochemical dissolved oxygen sensor based on the principle of fluorescence quenching has strong anti-interference ability, high measurement accuracy, good repeatability and stability, and is suitable for detecting and monitoring the concentration of dissolved oxygen in various water bodies. , at present, the fluorescence method ultra-low dissolved oxygen sensor is used more and more in semiconductor, boiler and other fields. On the fluorescent substance, the fluorescent substance is immediately excited by the blue light. When the excited substance returns to its original state, it will emit red light. This red light will be measured by the photodiode in the sensor. The time from being excited to returning to its original state after emitting red light, so that the content of dissolved oxygen in water can be measured. For the fluorescence method ultra-low dissolved oxygen sensor, although it has many advantages compared with the CLARK electrode method, the fluorescence method is ultra-low The calibration of the dissolved oxygen sensor in the effective range is a difficult problem in the industry, and there are currently no tools and equipment for the full range calibration of the fluorescence method ultra-low dissolved oxygen sensor on the market. When facing this problem, it is often necessary to use the fluorescence method ultra-low The dissolved oxygen sensor is transferred to the laboratory for calibration. The process is time-consuming and laborious, which brings great troubles to the staff. Based on this, we propose a dissolved oxygen calibration system to solve the above problems

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