CN100593718C - Method and device for detecting flow injection type dissolved oxygen meter - Google Patents
Method and device for detecting flow injection type dissolved oxygen meter Download PDFInfo
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- CN100593718C CN100593718C CN 200710017683 CN200710017683A CN100593718C CN 100593718 C CN100593718 C CN 100593718C CN 200710017683 CN200710017683 CN 200710017683 CN 200710017683 A CN200710017683 A CN 200710017683A CN 100593718 C CN100593718 C CN 100593718C
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Abstract
Disclosed are a flowing injection type oxygen dissolving meter testing method and a device thereof. Said device comprises a pipeline which has a valve and is connected to a water sample and to the intake terminal of a flowmeter, a flowmeter having its outlet terminal being connected to a standard oxygen dissolving meter through a pipeline, a trace flowmeter and a liquid delivery mechanism as wellas an oxygen saturation water tank are connected to each other and connected in parallel to the pipeline between the flowmeter and the standard oxygen dissolving meter, wherein the oxygen saturation water tank is also connected to output terminal of a gas source. According to the present invention, a water sample saturated with gas is continuously injected to a water flow having a low oxygen dissolving concentration, then the oxygen dissolving concentration of the water sample saturated with gas is capable of being ascertained by measuring oxygen partial pressure of the gas and temperature ofthe water sample, with improved veracity of the measured values of an oxygen dissolving meter. The standard water sample generated has a more correct dissolved oxygen concentration, then some disadvantages such as system leakage and system complexity are avoided, and then said standard water sample is more suitable for a site inspection and an online calibration of a oxygen dissolving meter.
Description
Technical field
The present invention relates to a kind of dissolved oxygen meter method of inspection and device, particularly a kind of flow injection type dissolved oxygen meter method of inspection and device.
Background technology
At present domestic and international existing dissolved oxygen meter check and scaling method have air standardization, electrolytic process and calibrating gas method.
The air standardization the saturated dissolved oxygen concentration in the corresponding water be about 8000 μ g/L, and in the generating plant water-steam system, the dissolved oxygen concentration during actual measurement is than low 2～3 orders of magnitude of dissolved oxygen concentration of air timing signal.Because when measuring the high concentration dissolved oxygen DO, the electrochemical reaction of sensor can change, and causes the response curve of electrode to be bent downwardly, cause error bigger when measuring the low concentration dissolved oxygen DO.It is the accuracy that might not guarantee dissolved oxygen meter measurement low concentration dissolved oxygen DO behind the empty school.
Electrolytic process is subjected to the influence of the factors such as accessory substance hydrogen of electrolytic efficiency variation, electrolytic reaction, and electrolytic process is produced than mistake and uncertainty.
The device of calibrating gas method is too complicated, itself also exists bigger error the calibrating gas that is used to demarcate, and calibrating gas is difficult to purchase and transportation, is easy to generate factor affecting such as system leak in the operating process of demarcating, and therefore use is comparatively difficult at the scene, error is bigger.
In sum, the dissolved oxygen meter check, the scaling method that also are not fit to on-the-spot use, accuracy and good reliability at present.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of and can improve accuracy and the reliability that online dissolved oxygen meter is measured, be more suitable for the flow injection type dissolved oxygen meter method of inspection and the device checking at the scene and demarcate.
For achieving the above object, verifying attachment of the present invention comprises: comprise the pipeline that has valve that is connected with water sample, this pipeline is connected with the inlet end of flowmeter, the endpiece of flowmeter is connected with the standard dissolved oxygen meter by pipeline, and the pipeline between flowmeter and standard dissolved oxygen meter also is parallel with micro-flowmeter, liquid transporting apparatus and the oxygen saturation water tank that is interconnected, and the oxygen saturation water tank also is connected with the output terminal of source of the gas.
Also be parallel with the deaerating plant that is connected with water sample between valve inlet of the present invention and the flowmeter, and also be provided with valve in the porch of deaerating plant; Liquid transporting apparatus is micro-dosing pump, carries or liquid level difference conveying liquid by gaseous tension; Source of the gas is air, oxygen or the mixed gas that finite concentration oxygen is arranged.
The method of inspection that the present invention adopts is:
1) sample is selected, if sample be the low concentration water sample then the low concentration water sample successively through first valve (1), second valve this moment (2) is closed, flowmeter of flowing through again (4) and standard dissolved oxygen meter (8), and the dissolved oxygen concentration of being measured the low concentration water sample by standard dissolved oxygen meter (8) is C
D(μ g/L), the flow that flowmeter (4) is measured the low concentration water sample is Q
D(ml/min);
If sample be the high concentration water sample then the high concentration water sample through second valve (2), first valve this moment (1) is closed, pass through deaerating plant (3) again the high concentration water sample is changed into the low concentration water sample, low concentration water sample after the conversion is through flowmeter (4) and standard dissolved oxygen meter (8), and the dissolved oxygen concentration of being measured the low concentration water sample by standard dissolved oxygen meter (8) is C
D(μ g/L), the flow that flowmeter (4) is measured the low concentration water sample is Q
D(ml/min);
2) after the dissolved oxygen concentration and flow of low concentration of water sample finished in measurement, open source of the gas, restart liquid transporting apparatus after making water sample in the oxygen saturation water tank reach oxygen saturation, water sample in the oxygen saturation water tank mixed with the low concentration water sample through micro-flowmeter obtain the standard water sample, the standard water sample enters the standard dissolved oxygen meter, and the flow of trace stream flowmeter measurement is Q
W(ml/min), checking in by the dissolved oxygen concentration of the saturated water sample of gas according to the temperature of gas oxygen dividing potential drop and water sample is C
B(μ g/L), standard water sample dissolved oxygen DO increment Delta C is calculated as follows:
The standard water sample that produces is sent in the sensor of tested dissolved oxygen meter, tested table is tested or demarcated.
The present invention's water sample that gas is saturated is injected in the low current of dissolved oxygen concentration continuously, dissolved oxygen concentration in the saturated water sample of gas is by the partial pressure of oxygen of gas and the temperature decision of water, be the partial pressure of oxygen of measurement gas and the temperature of gas saturation water sample, just can determine the dissolved oxygen concentration of the saturated water sample of gas; Can calculate the dilution ratio of saturated water sample by the flow of accurate metering water sample and the flow of gas saturation water sample injection, thereby calculate the oxygen increment of dissolved oxygen DO standard water sample.Compare with the air standardization, can produce the dissolved oxygen DO standard water sample of any concentration in 1 μ g/L～500 μ g/L scopes, therefore can provide the standard water sample identical or close with the measured concentration of online dissolved oxygen meter, after like this dissolved oxygen meter being tested and demarcating, the accuracy and the reliability of dissolved oxygen meter measured value improve greatly.Compare with electrolytic process, avoided the influence of the hydrogen of electrolytic efficiency variation and electrolysis generation, the dissolved oxygen concentration of the standard water sample that is produced is more accurate, and adjustable dissolved oxygen concentration scope is also bigger.Compare with the calibrating gas method, avoided the influence of unfavorable factors such as system leak, system complex, be more suitable for checking at the scene and demarcating online dissolved oxygen meter.
Test findings shows that in 10 μ g/L～100 μ g/L concentration ranges, the error of the dissolved oxygen DO standard water sample that the present invention produces is less than 2.0%FS.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail,
Referring to Fig. 1, the inventive system comprises the pipeline that has first valve 1 and second valve 2 that is connected with water sample, first valve 1 is connected with the inlet end of flowmeter 4, second valve 2 is connected by the inlet end of deaerating plant 3 with flowmeter 4, the endpiece of flowmeter 4 is connected with standard dissolved oxygen meter 8 by pipeline, and the pipeline between flowmeter 4 and standard dissolved oxygen meter 8 also is parallel with micro-flowmeter 7, liquid transporting apparatus 6 and the oxygen saturation water tank 5 that is interconnected, and oxygen saturation water tank 5 also is connected with the output terminal of source of the gas 9.
Principle of the present invention is: when the temperature of gas oxygen dividing potential drop and water certain, water sample by gas saturated after, the dissolved oxygen concentration in the water sample is exactly a definite value.Measurement gas partial pressure of oxygen and by the temperature of the saturated water sample of gas just can be determined the dissolved oxygen concentration of the saturated water sample of gas.The present invention is in order to obtain the dissolved oxygen DO standard water sample of concentration range at 1 μ g/L～500 μ g/L, and the water sample that gas is saturated is injected in the low current of dissolved oxygen concentration continuously; Can calculate the dilution ratio of saturated water sample by the flow of accurate metering water sample and the flow of saturated water sample injection, thereby calculate the oxygen increment of dissolved oxygen DO standard water sample.
Its method of inspection is: the low concentration water sample is successively through first valve 1, and this moment, exchange column second valve 2 was closed, flowmeter 4 and standard dissolved oxygen meter 8, and the dissolved oxygen concentration of measuring the low concentration water sample by standard dissolved oxygen meter 8 is C
D(μ g/L), the flow that flowmeter 4 is measured the low concentration water sample is Q
D(ml/min); After the dissolved oxygen concentration and flow of low concentration of water sample finished in measurement, start source of the gas 9, restart liquid transporting apparatus 6 after making water sample in the oxygen saturation water tank 5 reach oxygen saturation, water sample in the oxygen saturation water tank 5 mixed with the low concentration water sample through micro-flowmeter 7 obtain the standard water sample, the standard water sample enters standard dissolved oxygen meter 8, and the flow that micro-flowmeter 7 is measured is Q
W(ml/min), checking in by the dissolved oxygen concentration of the saturated water sample of gas according to the temperature of gas oxygen dividing potential drop and water sample is C
B(μ g/L) works as Q
DMuch larger than Q
WThe time, standard water sample dissolved oxygen DO increment Delta C is calculated as follows:
The standard water sample that produces is sent in the sensor of tested dissolved oxygen meter, tested table is tested or demarcated.
Claims (4)
1, a kind of flow injection type dissolved oxygen meter verifying attachment, it is characterized in that: comprise the pipeline that has first valve (1) that is connected with water sample, this pipeline is connected with the inlet end of flowmeter (4), also be parallel with the deaerating plant (3) that is connected with water sample between first valve (1) inlet and the flowmeter (4), and also be provided with second valve (2) in the porch of deaerating plant (3), the endpiece of flowmeter (4) is connected with standard dissolved oxygen meter (8) by pipeline, and the pipeline between flowmeter (4) and standard dissolved oxygen meter (8) also is parallel with the micro-flowmeter (7) that is interconnected, liquid transporting apparatus (6) and oxygen saturation water tank (5), oxygen saturation water tank (5) also are connected with the output terminal of source of the gas (9).
2, flow injection type dissolved oxygen meter verifying attachment according to claim 1 is characterized in that: said liquid transporting apparatus (6) is micro-dosing pump, carries liquid by gaseous tension or liquid level difference.
3, flow injection type dissolved oxygen meter verifying attachment according to claim 1 is characterized in that: said source of the gas (9) is air, oxygen or the mixed gas that finite concentration oxygen is arranged.
4, a kind of method of inspection according to the described device of claim 1 is characterized in that:
1) sample is selected, if sample be the low concentration water sample then the low concentration water sample successively through first valve (1), second valve this moment (2) is closed, flowmeter of flowing through again (4) and standard dissolved oxygen meter (8), and the dissolved oxygen concentration of being measured the low concentration water sample by standard dissolved oxygen meter (8) is C
D(μ g/L), the flow that flowmeter (4) is measured the low concentration water sample is Q
D(ml/min);
If sample be the high concentration water sample then the high concentration water sample through second valve (2), first valve this moment (1) is closed, pass through deaerating plant (3) again the high concentration water sample is changed into the low concentration water sample, low concentration water sample after the conversion is through flowmeter (4) and standard dissolved oxygen meter (8), and the dissolved oxygen concentration of being measured the low concentration water sample by standard dissolved oxygen meter (8) is C
D(μ g/L), the flow that flowmeter (4) is measured the low concentration water sample is Q
D(ml/min);
2) after the dissolved oxygen concentration and flow of low concentration of water sample finished in measurement, open source of the gas (9), restart liquid transporting apparatus (6) after making water sample in the oxygen saturation water tank (5) reach oxygen saturation, water sample in the oxygen saturation water tank (5) mixed with the low concentration water sample through micro-flowmeter (7) obtain the standard water sample, the standard water sample enters standard dissolved oxygen meter (8), and the flow that micro-flowmeter (7) is measured is Q
W(ml/min), checking in by the dissolved oxygen concentration of the saturated water sample of gas according to the temperature of gas oxygen dividing potential drop and water sample is C
B(μ g/L), standard water sample dissolved oxygen DO increment Delta C is calculated as follows:
The standard water sample that produces is sent in the sensor of tested dissolved oxygen meter, tested table is tested or demarcated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710017683 CN100593718C (en) | 2007-04-13 | 2007-04-13 | Method and device for detecting flow injection type dissolved oxygen meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710017683 CN100593718C (en) | 2007-04-13 | 2007-04-13 | Method and device for detecting flow injection type dissolved oxygen meter |
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| CN100593718C true CN100593718C (en) | 2010-03-10 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128871A (en) * | 2010-11-29 | 2011-07-20 | 西安热工研究院有限公司 | Flowing adding sodium analyzer checking method and device |
| CN104330530B (en) * | 2014-10-29 | 2016-05-18 | 核工业北京化工冶金研究院 | A kind of DO determination device and assay method |
| CN105807000B (en) * | 2016-03-17 | 2017-11-24 | 山东电力研究院 | A kind of on-line chemical monitoring instrument standard calibration device and method |
| CN109342678B (en) * | 2018-10-11 | 2024-01-30 | 中国船舶重工集团公司第七一九研究所 | Dissolved oxygen meter circulating type dynamic verification system |
| CN111289601B (en) * | 2020-02-20 | 2020-12-01 | 四川大学 | Method for improving measurement accuracy of dissolved gas concentration in water body |
| CN112067681B (en) * | 2020-09-24 | 2023-03-10 | 山东省计量科学研究院 | Calibration system and calibration method for trace dissolved oxygen tester |
| CN112858613B (en) * | 2021-01-20 | 2023-08-22 | 北京华科仪科技股份有限公司 | Device for calibrating trace dissolved oxygen monitor on line and operation method thereof |
| CN116297776B (en) * | 2023-05-25 | 2023-08-18 | 华南农业大学 | Electrolytic type dissolved oxygen rapid detection device and method |
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Non-Patent Citations (2)
| Title |
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| 发电厂水汽系统溶解所的在线测量. 曹杰玉等.热力发电，第5期. 2005 |
| 发电厂水汽系统溶解所的在线测量. 曹杰玉等.热力发电，第5期. 2005 * |
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