CN103616481B - The scaling method of dissolved oxygen sensor and device - Google Patents
The scaling method of dissolved oxygen sensor and device Download PDFInfo
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- CN103616481B CN103616481B CN201310637434.8A CN201310637434A CN103616481B CN 103616481 B CN103616481 B CN 103616481B CN 201310637434 A CN201310637434 A CN 201310637434A CN 103616481 B CN103616481 B CN 103616481B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 239000001301 oxygen Substances 0.000 title claims abstract description 133
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000007789 gas Substances 0.000 claims abstract description 129
- 239000000203 mixture Substances 0.000 claims abstract description 66
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 230000009467 reduction Effects 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 12
- 208000027418 Wounds and injury Diseases 0.000 abstract description 6
- 230000006378 damage Effects 0.000 abstract description 6
- 208000014674 injury Diseases 0.000 abstract description 6
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 5
- 239000012085 test solution Substances 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 150000002926 oxygen Chemical class 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a kind of scaling method and device of dissolved oxygen sensor, stated accuracy is high, and structure is simple, easy to operate, adopts composition gas (N
2and O
2mixed gas) demarcate replace standardization of solution, solve the unstable impact on measuring error of oxygen concentration in solution, by the composition gas by the preparation of design proportioning, obtain the different oxygen concentrations that precision is higher, simplify the proportioning process of different oxygen concentrations in solution, improve the precision of oxygen concentration, save the nominal time, the composition gas of employing is N
2and O
2combination gas, be diffused into the pollution that can not cause air in air, simultaneously, calibration process, without any need for chemical reagent, avoids the injury to human body and the secondary pollution to test solution, and a whole set of dissolved oxygen sensor device only needs a set of closed container, with the mixed gas of several variable concentrations prepared, make standard set-up more succinct, more convenient operation, has a good application prospect.
Description
Technical field
The present invention relates to field of measuring technique, be specifically related to a kind of scaling method and device of dissolved oxygen sensor.
Background technology
Traditional dissolved oxygen sensor, general use 2 demarcation, namely Zero calibration and full scale are demarcated, and it demarcates liquid and scaling method is respectively: by excessive Na
2sO
3being dissolved in distilled water, through fully stirring, making Na
2sO
3oxygen in solution is absorbed totally, obtains oxygen-free water solution, the zero-error of determining instrument; When (25 ± 0.5) DEG C, air is passed into distilled water and after dissolved oxygen concentration is wherein reached capacity, standing a period of time makes dissolved oxygen DO reach stable again, then the range error of determining instrument, needs ceaselessly to stir solution when range is measured, prevents the moment contacted with film by the dissolved oxygen depletion in this position solution, affect measuring error, whole process probably needs 30 minutes, and the time is longer, and Zero calibration needs chemical reagent Na
2sO
3spread effect is had to eyes, skin, mucous membrane, and demarcate generation waste liquid, should to environment, full scale timing signal, in order to reach oxygen saturation and concentration stabilize, lead to air enough for a long time and also need leave standstill certain hour, therefore demarcate length consuming time, demarcation efficiency is low, the most important thing is that this scaling method cannot carry out precision test to other points within the scope of surveying instrument;
In addition, in some document, report another kind of test method, first formulate saturated N respectively
2solution and saturated O
2solution, by regulating the flow velocity of peristaltic pump, then mixing by different ratios, obtaining the concentration of oxygen in different solutions, thus reaching the object to dissolved oxygen sensor performance detecting, two kinds of saturated N
2solution and saturated O
2length setup time of solution, poor stability, and be subject to the impact of peristaltic pump precision, dissolved oxygen concentration is difficult to reach accuracy of instrument requirement.
And two kinds of above-mentioned scaling method knots are enough complicated, and complex operation, in aqueous solution, oxygen concentration should not reach stable.
Summary of the invention
Technical matters solved by the invention is the scaling method of the dissolved oxygen sensor overcoming prior art, and precision is low, and knot is enough complicated, and complex operation, in aqueous solution, oxygen concentration should not reach stable.The scaling method of dissolved oxygen sensor of the present invention and device, stated accuracy is high, and structure is simple, and easy to operate, calibration process, without any need for chemical reagent, avoids the injury to human body and the secondary pollution to test solution.Package unit only needs a set of closed container, and the mixed gas of several variable concentrations prepared, and makes standard set-up more succinct, more convenient operation.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A scaling method for dissolved oxygen sensor, is characterized in that: comprise the following steps,
Step (1), carries out gear division by the measurement range of dissolved oxygen sensor;
Step (2), the measurement range of the dissolved oxygen sensor after dividing according to gear, the mixed gas of proportioning corresponding concentration is divided in each composition gas bottle respectively, and described mixed gas is nitrogen, oxygen composition gas;
Step (3), integrated temperature sensor in dissolved oxygen sensor, measured value carries out temperature compensation;
Step (4), selects corresponding composition gas bottle, demarcates the respective notch of dissolved oxygen sensor;
Step (5), changes the composition gas bottle that the mixed gas of different ratio concentration is corresponding, repeats the demarcation of step (4), until all gears have all been demarcated in the measurement range of dissolved oxygen sensor.
The scaling method of aforesaid dissolved oxygen sensor, is characterized in that: step (1) dissolved oxygen sensor divides 6 gears according to measurement range equal proportion.
The scaling method of aforesaid dissolved oxygen sensor, is characterized in that: step (4) selects corresponding composition gas bottle, to the method that the respective notch of dissolved oxygen sensor is demarcated, comprises the following steps,
(1) open the reduction valve of composition gas bottle, by the gas inject sealable tank in composition gas bottle, and observe the tensimeter of combination gas bottle, make air pressure maintain 5 ~ 8 Mpa;
(2) dissolved oxygen sensor, standard thermometer pass to host computer the measured data of sealable tank respectively, and host computer shows accepted data in real time by software, for operating personnel's observation, record;
(3) injecting gas, until the gas concentration in sealable tank is identical with gas concentration in composition gas bottle, and after stablizing, operating personnel record temperature value, the oxygen concentration value of dissolved oxygen sensor, the temperature value of record standard thermometer, the oxygen density value of record composition gas bottle, by the form that the data inputting of record is demarcated.
Based on the device of the scaling method of dissolved oxygen sensor, it is characterized in that: comprise many group composition gas bottles, each composition gas bottle is built with nitrogen, the oxygen composition gas of different ratio, each composition gas bottle is provided with rain glass and reduction valve, one end of reduction valve is connected with sealable tank by gas piping, be provided with dissolved oxygen sensor and standard thermometer in described sealable tank, described dissolved oxygen sensor is connected with host computer respectively by data line with standard thermometer.
The caliberating device of aforesaid dissolved oxygen sensor, is characterized in that: the quantity of described composition gas bottle is consistent with the numbers of gear steps of dissolved oxygen sensor.
The caliberating device of aforesaid dissolved oxygen sensor, is characterized in that: described sealable tank is provided with two ball valves, and a ball valve is connected with reduction valve by gas piping, and another ball valve is for discharging mixed gas.
The caliberating device of aforesaid dissolved oxygen sensor, is characterized in that: the junction of described sealable tank and data line adopts taper ring to seal.
The caliberating device of aforesaid dissolved oxygen sensor, is characterized in that: the junction of described dissolved oxygen sensor and standard thermometer and sealable tank adopts rubber seal.
The invention has the beneficial effects as follows: the scaling method of dissolved oxygen sensor of the present invention and device, stated accuracy is high, and structure is simple, easy to operate, adopts composition gas (N
2and O
2mixed gas) demarcate replace standardization of solution, solve the unstable impact on measuring error of oxygen concentration in solution, by the composition gas by the preparation of design proportioning, obtain the different oxygen concentrations that precision is higher, simplify the proportioning process of different oxygen concentrations in solution, improve the precision of oxygen concentration, save the nominal time, the composition gas of employing is N
2and O
2combination gas, be diffused into the pollution that can not cause air in air, simultaneously, calibration process, without any need for chemical reagent, avoids the injury to human body and the secondary pollution to test solution, and a whole set of dissolved oxygen sensor device only needs a set of closed container, with the mixed gas of several variable concentrations prepared, make standard set-up more succinct, more convenient operation, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the caliberating device of dissolved oxygen sensor of the present invention.
Mark in accompanying drawing is as follows:
1: composition gas bottle; 2: rain glass; 3: reduction valve; 4: data line; 5: host computer; 6: gas piping; 7: sealable tank; 8: ball valve.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
The scaling method of dissolved oxygen sensor of the present invention, stated accuracy is high, and structure is simple, easy to operate, adopts composition gas (N
2and O
2mixed gas) demarcate and replace standardization of solution, the unstable impact on measuring error of oxygen concentration in solution can be solved.By the composition gas of buying by the preparation of design proportioning, can obtain the different oxygen concentrations that precision is higher, simplify the proportioning process of different oxygen concentrations in solution, improve the precision of oxygen concentration, save the nominal time, the composition gas of employing is N
2and O
2mixed gas, be diffused into the pollution that can not cause air in air, meanwhile, calibration process, without any need for chemical reagent, avoids the injury to human body and the secondary pollution to test solution, specifically comprises the following steps,
Step (1), carries out gear division by the measurement range of dissolved oxygen sensor, divides 6 gears according to measurement range equal proportion;
Step (2), the measurement range of the dissolved oxygen sensor after dividing according to gear, the mixed gas of proportioning corresponding concentration is divided in each composition gas bottle respectively, and described mixed gas is nitrogen, oxygen composition gas;
Step (3), integrated temperature sensor in dissolved oxygen sensor, measured value carries out temperature compensation, and temperature compensation principle illustrates,
Be 20.9% according to oxygen concentration in air, and under different temperatures in water saturated oxygen concentration with reference to JJG291-2008 appendix C, the oxygen concentration of configuration composition gas can be converted into water oxygen concentration, method is,
First, suppose that the concentration configuring composition gas is 10%;
At 25 DEG C, looking into saturated oxygen concentration in the known water of JJG291-2008 appendix C is 8.25mg/L,
Oxygen content is the oxygen concentration of the composition gas of 10%, and when being equivalent to 25 DEG C, the oxygen concentration in water is, 10%*8.25/20.9%=3.95mg/L; When temperature is different, look into JJG291-2008 appendix C known, in water, saturated oxygen concentration is just different, is similarly the oxygen concentration of the composition gas of 10%, is converted into water oxygen concentration just different; When supposing 20 DEG C, looking into saturated oxygen concentration in the known water of JJG291-2008 appendix C is 9.08mg/L, and oxygen content is now the oxygen concentration of the composition gas of 10%, and when being equivalent to 20 DEG C, the oxygen concentration in water is: 10%*9.08/20.9%=4.34mg/L;
The relation between oxygen concentration and water oxygen concentration in composition gas can be set up, improve stated accuracy high;
Step (4), selects corresponding composition gas bottle, demarcates, when temperature compensation, comprise the following steps the respective notch of dissolved oxygen sensor,
(1) reduction valve of composition gas bottle is opened, by the gas inject sealable tank in composition gas bottle, and observe the tensimeter of combination gas bottle, air pressure is made to maintain 5 ~ 8 Mpa, air pressure is unsuitable excessive or too small, excessive high pressure gas is known from experience to be made dissolved oxygen sensor and sealable tank produce to collide, easily cause sensor degradation, and gases at high pressure and the fricative noise of reduction valve also have certain injury to operating personnel; Residual gas in sealable tank cannot thoroughly be discharged by too small air pressure, and easily causes atmospheric reflux in sealable tank, affects stated accuracy;
(2) dissolved oxygen sensor, standard thermometer pass to host computer the measured data of sealable tank respectively, and host computer shows accepted data in real time by software, for operating personnel's observation, record;
(3) injecting gas, until the gas concentration in sealable tank is identical with gas concentration in composition gas bottle, and after stablizing, this process is probably for sealable tank injected mixed gas after 30 seconds, gas concentration in sealable tank is substantially identical with gas concentration in composition gas bottle, after 60 seconds, the measured value of dissolved oxygen sensor is stablized, after value stabilization to be measured, operating personnel record temperature value, the oxygen concentration value of dissolved oxygen sensor, the temperature value of record standard thermometer, the oxygen density value of record oxygen, nitrogen composition gas bottle 1, demarcates form by the data inputting of record;
Step (5), changes the composition gas bottle that the mixed gas of different ratio concentration is corresponding, repeats the demarcation of step (4), until all gears have all been demarcated in the measurement range of dissolved oxygen sensor.
As shown in Figure 1, based on the device of the scaling method of dissolved oxygen sensor, comprise many group composition gas bottles 1, each composition gas bottle 1 is built with nitrogen, the oxygen composition gas of different ratio, each composition gas bottle 1 is provided with rain glass 2 and reduction valve 3, one end of reduction valve 3 is connected with sealable tank 7 by gas piping 6, is provided with dissolved oxygen sensor and standard thermometer in sealable tank 7, and dissolved oxygen sensor is connected with host computer respectively by data line 4 with standard thermometer.
The quantity of described composition gas bottle 1 is consistent with the numbers of gear steps of dissolved oxygen sensor, is 6.
On described sealable tank, 1 is provided with two ball valves, 8, ball valve 8 and is connected with reduction valve 3 by gas piping 6, and another ball valve 8 is for discharging mixed gas, and ball valve 8 facilitates discharge and the sealing of mixed gas;
Described sealable tank 7 adopts taper ring to seal with the junction of data line 4; The junction of described dissolved oxygen sensor and standard thermometer and sealable tank 7 adopts rubber seal, improves sealing, increases the accuracy of demarcating.
The calibration process of the caliberating device of dissolved oxygen sensor of the present invention is as follows:
The measurement range of dissolved oxygen sensor is divided into 6 grades (can require to carry out gear division according to difference), the mixed gas of different ratio concentration is divided in various combination gas bottle 1, the composition gas bottle 1 of variable concentrations is changed according to the measured value difference of demarcating, because dissolved oxygen DO is larger by the impact of temperature, measured value need carry out temperature compensation, therefore dissolved oxygen sensor inside is integrated with temperature sensor, so need standard thermometer to carry out than survey at timing signal, for improving stated accuracy, dissolved oxygen sensor and standard thermometer load in sealable tank 7 jointly, for ensureing impermeability, each junction of sealable tank all adopts rubber seal, dissolved oxygen sensor is connected with host computer 5 respectively by data line 4 with standard thermometer, data line and sealable tank junction adopt taper ring to seal, rain glass 2 and reduction valve 3 composition gas bottle 1 be equipped with, composition gas enters sealable tank 7 by gas pipe line 9, two ball valves 8 sealable tank 7 housing are equipped with, exchange with extraneous gas to realize sealable tank 7,
Timing signal, different composition gas bottles 1 is selected according to different oxygen concentrations, open reduction valve 3, gas in composition gas bottle 1 just injects sealable tank 7 (note: will ensure the upper of sealable tank 7 in the process of injecting gas by gas piping 6, lower two ball valves are opened simultaneously), rain glass 2 is observed in injection process, air pressure is made to maintain 5 ~ 8 Mpa, here air pressure is unsuitable excessive or too small, excessive high pressure gas is known from experience to be made dissolved oxygen sensor and sealable tank 7 produce to collide, easily cause sensor degradation, and gases at high pressure and the fricative noise of reduction valve 3 also have certain injury to operating personnel, residual gas in sealable tank cannot thoroughly be discharged by too small air pressure, and easily causes atmospheric reflux in sealable tank 7, affects stated accuracy.Dissolved oxygen sensor, standard thermometer pass to host computer 5 respectively by data line 4 measured data, and host computer 5 shows passed data in real time by software, for operating personnel's observation, record; Injecting gas is after 30 seconds, and the gas concentration in sealable tank 7 is substantially identical with gas concentration in oxygen, nitrogen composition gas bottle 1; After 60 seconds, the measured value of dissolved oxygen sensor is stablized.After value stabilization to be measured, operating personnel record temperature value, the oxygen concentration value of dissolved oxygen sensor, the temperature value of record standard thermometer, the oxygen density value of record oxygen, nitrogen composition gas bottle 1.The data inputting of record is demarcated form, closes reduction valve 3, change oxygen, the nitrogen composition gas bottle 1 of different ratio concentration, repeat above-mentioned proving operation, until all gears of dissolved oxygen sensor have all been demarcated.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (8)
1. the scaling method of dissolved oxygen sensor, is characterized in that: comprise the following steps,
Step (1), carries out gear division by the measurement range of dissolved oxygen sensor;
Step (2), the measurement range of the dissolved oxygen sensor after dividing according to gear, the mixed gas of proportioning corresponding concentration is divided in each composition gas bottle respectively, and described mixed gas is nitrogen, oxygen composition gas;
Step (3), integrated temperature sensor in dissolved oxygen sensor, measured value carries out temperature compensation;
Step (4), selects corresponding composition gas bottle, demarcates the respective notch of dissolved oxygen sensor;
Step (5), changes the composition gas bottle that the mixed gas of different ratio concentration is corresponding, repeats the demarcation of step (4), until all gears have all been demarcated in the measurement range of dissolved oxygen sensor.
2. the scaling method of dissolved oxygen sensor according to claim 1, is characterized in that: step (1) dissolved oxygen sensor divides 6 gears according to measurement range equal proportion.
3. the scaling method of dissolved oxygen sensor according to claim 1, is characterized in that: step (4) selects corresponding composition gas bottle, to the method that the respective notch of dissolved oxygen sensor is demarcated, comprises the following steps,
(1) open the reduction valve of composition gas bottle, by the gas inject sealable tank in composition gas bottle, and observe the tensimeter of combination gas bottle, make air pressure maintain 5 ~ 8 Mpa;
(2) dissolved oxygen sensor, standard thermometer pass to host computer the measured data of sealable tank respectively, and host computer shows received data in real time by software, for operating personnel's observation, record;
(3) injecting gas, until the gas concentration in sealable tank identical with gas concentration in composition gas bottle and stable after, operating personnel record temperature value, the oxygen concentration value of dissolved oxygen sensor, the temperature value of record standard thermometer, the oxygen density value of record composition gas bottle, by the form that the data inputting of record is demarcated.
4. based on the device of the scaling method of dissolved oxygen sensor according to claim 1, it is characterized in that: comprise many group composition gas bottles, each composition gas bottle is built with nitrogen, the oxygen composition gas of different ratio, each composition gas bottle is provided with rain glass and reduction valve, one end of reduction valve is connected with sealable tank by gas piping, be provided with dissolved oxygen sensor and standard thermometer in described sealable tank, described dissolved oxygen sensor is connected with host computer respectively by data line with standard thermometer.
5. the device of the scaling method of dissolved oxygen sensor according to claim 4, is characterized in that: the quantity of described composition gas bottle is consistent with the numbers of gear steps of dissolved oxygen sensor.
6. the device of the scaling method of dissolved oxygen sensor according to claim 4, is characterized in that: described sealable tank is provided with two ball valves, and a ball valve is connected with reduction valve by gas piping, and another ball valve is for discharging mixed gas.
7. the device of the scaling method of dissolved oxygen sensor according to claim 4, is characterized in that: the junction of described sealable tank and data line adopts taper ring to seal.
8. the device of the scaling method of dissolved oxygen sensor according to claim 4, is characterized in that: the junction of described dissolved oxygen sensor and standard thermometer and sealable tank adopts rubber seal.
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| CN105675803B (en) * | 2014-11-19 | 2017-08-04 | 中国石油天然气股份有限公司 | Gas calibration device and method applied to under-balanced drilling UBD |
| CN104515761B (en) * | 2014-12-20 | 2017-05-17 | 国家海洋局第二海洋研究所 | High-precision optical dissolved oxygen sensor calibration method and device |
| DE102016123583A1 (en) * | 2016-12-06 | 2018-06-07 | Endress+Hauser Conducta Gmbh+Co. Kg | Method for adjusting a measuring device |
| CN107607672B (en) * | 2017-08-29 | 2018-12-28 | 广州海洋地质调查局 | A kind of underwater gas sensor calibrator (-ter) unit and calibration method |
| CN109884263B (en) * | 2019-03-28 | 2023-12-15 | 江苏核电有限公司 | Dissolved oxygen sensor test device and test method thereof |
| CN111044589A (en) * | 2019-12-02 | 2020-04-21 | 河北冀研能源科学技术研究院有限公司 | Preparation method of zero-point correction oxygen-free water for electrodes of online dissolved oxygen meter in thermal power plant |
| CN111239091A (en) * | 2020-02-23 | 2020-06-05 | 江苏省农业科学院 | Dissolved oxygen sensor calibration device and calibration method based on fluorescence quenching principle |
| CN113916849B (en) * | 2021-09-10 | 2022-07-29 | 山东省科学院海洋仪器仪表研究所 | Calibration method and calibration device for optical dissolved oxygen sensor |
| CN113866362A (en) * | 2021-09-28 | 2021-12-31 | 明石创新(烟台)微纳传感技术研究院有限公司 | Intelligent efficient accurate oxygen measuring instrument calibration and compensation method |
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