Dissolved oxygen calibration system

Abstract

The invention discloses a dissolved oxygen calibration system which is scientific and reasonable in structure and comprises a mounting plate. The mounting plate is provided with a water control assembly, a gas control assembly, a detection assembly and a drainage assembly. The water control assembly is communicated with the gas control assembly through a pipeline, and the gas control assembly is communicated with the detection assembly through a pipeline. The detection assembly is communicated with the drainage assembly through a pipeline, the water control assembly comprises a hand wheel valve, a first electrically operated valve and a check valve, use is safe and convenient, all the electrically operated valves and the dissolved oxygen sensor are connected together through the calibration system to form a whole pipeline system, and the closing state of all the electrically operated valves is controlled through the controller. On-off of a water path and an air path is realized. The dissolved oxygen sensor is used for detecting the content of dissolved oxygen in water by means of the gas circuit, the automatic calibration and test functions of the dissolved oxygen sensor are achieved by means of the gas circuit, and the tedious operation process that the dissolved oxygen sensor needs to be detached and sent back to a laboratory in the prior art can be effectively avoided.

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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