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Dissolved oxygen meter calibration test system and method

A test system and calibration method technology, applied in the direction of testing water, measuring devices, instruments, etc., can solve the problems of unguaranteed accuracy, affecting calibration accuracy, long calibration time, etc., to achieve accurate methods and improve measurement accuracy. Effect

Pending Publication Date: 2021-10-01
XIAN THERMAL POWER RES INST CO LTD
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  • Application Information

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Problems solved by technology

[0004] These two calibration methods have some problems in the actual operation process. For example, for the dissolved oxygen meter measured by polarography, the polarization of the electrode will consume part of the oxygen, causing the oxygen concentration in the standard solution to be lower than the nominal value. affect the accuracy of the calibration
In addition, according to the principle of chemical equilibrium, it is known that using sodium sulfite to configure the zero oxygen water standard solution, the concentration of oxygen in the reactant cannot be reduced to zero, and there is still a trace amount of oxygen during equilibrium, and the time required for equilibrium is more than 2 hours, not only Calibration time is long and accuracy is not guaranteed

Method used

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  • Dissolved oxygen meter calibration test system and method

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Embodiment 1

[0044] A zero oxygen calibration test method for a dissolved oxygen meter calibration test system, comprising the following steps:

[0045] Step 1. Adjust the constant temperature tank 1 to adjust the desalted water in the sealed water tank 2 to a preset temperature.

[0046] The aforementioned preset temperature is 25±2°C, that is, the desalted water is heated to 25°C.

[0047] Step 2. Continuously feed pure nitrogen gas into the sealed water tank 2 from the entrance of the air inlet pipe 3 until the nitrogen fills the space above the liquid level of the desalted water. The air space above the liquid level of the desalted water in the sealed water tank 2 is in a positive pressure state, and the air cannot Enter until nitrogen is discharged from the exhaust pipe 7, so that the desalinated water reaches a zero-oxygen state under constant temperature and pressure conditions, that is, the dissolved oxygen content of the desalinated water is less than 1 μg / L, and the desalinated w...

Embodiment 2

[0054] A saturated oxygen calibration test method for a dissolved oxygen meter calibration test system, comprising the following steps:

[0055] Step 1. Adjust the constant temperature tank 1 so that the desalinated water in the sealed water tank 2 is adjusted to a preset temperature.

[0056] Step 2. Continuously feed gas with a known oxygen concentration into the sealed water tank 2 from the inlet of the air intake pipe 3, so that the gas fills the air space above the liquid level of the desalinated water in the sealed water tank 2, and then discharges it from the exhaust pipe 7. Under constant pressure conditions, the desalted water finally reaches oxygen saturation.

[0057] The gas with known oxygen concentration is air, and the dissolved oxygen concentration c' in desalted water in the oxygen saturated state s It can be calculated by the following formula:

[0058]

[0059] In the formula: c' s —When the temperature is t and the air pressure is p(kPa), the solubili...

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Abstract

The invention discloses a dissolved oxygen meter calibration test system and method. The system comprises a thermostatic bath, a sealed water tank, an air inlet pipe, a dissolved oxygen meter, a thermometer, a pressure meter, an exhaust pipe and a circulating pump. According to the system, gas with known oxygen concentration is introduced into demineralized water in a sealed water tank, so that the demineralized water reaches a saturated state, and a dissolved oxygen meter is calibrated and tested by the demineralized water in a flowing state. According to the system and the method, the stability of the saturated oxygen content in the demineralized water is guaranteed in a dynamic circulation mode, the method is more accurate, simpler and more convenient, meanwhile, fluctuation of dissolved oxygen in the calibration and test process is avoided, and the measurement accuracy of a dissolved oxygen meter is improved.

Description

technical field [0001] The invention relates to the detection field of dissolved oxygen in water, in particular to a dissolved oxygen meter calibration test system and method. Background technique [0002] Dissolved oxygen meter measurement technology is mainly divided into optical method and polarographic method. Among them, the optical dissolved oxygen measurement technology utilizes the characteristics of the quenching effect of dissolved oxygen on fluorescence, and obtains the concentration of dissolved oxygen by detecting the change of fluorescence intensity. [0003] The polarographic dissolved oxygen measurement technology is based on the Clark electrode measurement principle of gold cathode and silver anode. When measuring water samples, the oxygen-permeable membrane prevents the electrode electrolyte from directly contacting the water sample, and molecular oxygen can enter the electrode electrolyte from the oxygen-permeable membrane. In a certain polarization volta...

Claims

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Application Information

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IPC IPC(8): G01N33/18G01N27/416
CPCG01N33/18G01N27/4163
Inventor 潘珺刘玮黄茜钟杰孙祥飞刘欣贾予平
Owner XIAN THERMAL POWER RES INST CO LTD
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