CN112946024A - Method for testing measurement characteristics of residual chlorine sensor - Google Patents
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Abstract
The invention discloses a method for testing the measurement characteristics of a residual chlorine sensor, which comprises the following steps: preparing sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration according to the concentration measurement range of the residual chlorine sensor to be measured; respectively carrying out time-sharing point-by-point measurement on the prepared sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration by using a high-precision spectrophotometer, and recording measurement to obtain first measurement data and measurement time related to the content of residual chlorine; and obtaining a time period with slow decay of the sodium hypochlorite standard solution based on the first measurement data and the measurement time, and taking the time period with slow decay of the sodium hypochlorite standard solution as a correction and measurement time period of the residual chlorine sensor to be measured. The invention can be used for quickly and accurately detecting the measurement characteristics of the residual chlorine sensor when the detected aqueous medium is in a static state.
Description
Technical Field
The invention relates to the technical field of detection of a residual chlorine sensor, in particular to a detection method of measurement characteristics of the residual chlorine sensor.
Background
The dynamic and real reflection of the water quality condition of the tail end of a drinking water supply pipe network is very important, and is related to the water safety and body health of water users, so that an online water quality monitoring and early warning system needs to be established at the tail end of the pipe network. The general method is that an online water quality detection device (composed of a water quality sensor, a measurement cavity, a circulation tank and the like) is arranged at a pipe network close to a user end, and the whole process of water quality detection is completed through the processes of real-time sampling, flow detection, detection water discharge and the like. Meanwhile, the measured values of the water quality real-time parameters (mainly comprising residual chlorine, turbidity, pH value and the like) obtained by detection are remotely transmitted to a water quality early warning platform for data processing and decision making.
The existing online water quality detection methods all need to measure under the condition of a certain range of flow rate, namely sampling water flows and is measured at the same time. This results in large volumes of drinking water being drained into the ground, both wasting water and causing local land losses or pollution.
The innovative methods (the related invention patents are applied) proposed at present are: arranging a self-circulation measuring device in a measured pipe network, automatically replacing drinking water in a measuring cavity at intervals, and then measuring water quality parameters of the measured drinking water in a static state; after the measurement is finished, the measured drinking water automatically flows into a water supply network; thus, the above process is repeated continuously. The good place is that: the measured drinking water cannot be wasted, and meanwhile, the soil near the measuring device cannot be polluted and taken away; the measurement result is irrelevant to the flow velocity of the measured fluid, and a value transmission system, a measured standard solution and the like are easy to establish.
At present, the online water quality measurement parameters recommended by the state mainly comprise 3-4 items, namely: turbidity, pH, residual chlorine, or supplemental conductivity. It is a significant advantage to perform online measurements of water quality at rest in fluids, such as: when the turbidity is measured, no additional measurement error is generated due to the flow of the fluid; the measurement results of the pH value and the conductivity in the static state are more stable and reliable relative to the flowing state. The identification and correction of the three sensors are convenient, and the detection and correction can be carried out in standard liquid which is correspondingly static in a laboratory.
However, for the on-line measurement of the residual chlorine by the electrode method, the sensor is usually required to be carried out in a flowing state, because the liquid can improve the measurement sensitivity of the sensor (i.e. increase the reaction speed between the residual chlorine and the sensor electrode) in the flowing state. Laboratory or field calibration of the measured properties of such residual chlorine sensors is currently common practice in flow conditions. With the popularization and application of the novel constant-voltage residual chlorine sensor, the sensor can work in the measurement of static fluid under certain conditions.
When the residual chlorine sensor works in a static state of the tested aqueous medium, how to identify the product quality of the residual chlorine sensor and how to establish a quantity transmission system needs to establish a new way and a new method.
Disclosure of Invention
The invention provides a method for testing the measurement characteristics of a residual chlorine sensor, which can be used for quickly and accurately testing the measurement characteristics of the residual chlorine sensor when a tested aqueous medium is in a static state.
In order to solve the above technical problem, the present invention provides a method for testing a measurement characteristic of a residual chlorine sensor, comprising:
preparing sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration according to the concentration measurement range of the residual chlorine sensor to be measured;
respectively carrying out time-sharing point-by-point measurement on the prepared sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration by using a high-precision spectrophotometer, and recording measurement to obtain first measurement data and measurement time related to the content of residual chlorine;
obtaining a time period of slow decay of the sodium hypochlorite standard solution based on the first measurement data and the measurement time, and taking the time period of slow decay of the sodium hypochlorite standard solution as a time period of correction and measurement of the residual chlorine sensor to be measured;
respectively inserting the residual chlorine sensor to be measured into sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration in the correction and measurement time periods to test so as to obtain second measurement data of the three sodium hypochlorite standard solutions about the residual chlorine content;
and judging whether the measurement characteristics of the residual chlorine sensor to be measured are qualified or not based on the first measurement data, the second measurement data and the maximum allowable error.
Preferably, the method for testing the measurement characteristics of the residual chlorine sensor further includes: and correcting the indicating value of the second measurement data through the embedded system when the measurement characteristic of the residual chlorine sensor to be measured is judged to be unqualified.
Preferably, in the above technical solution, the high-concentration sodium hypochlorite standard solution is a sodium hypochlorite standard solution having a concentration close to the maximum value of the concentration measurement range, the medium-concentration sodium hypochlorite standard solution is a sodium hypochlorite standard solution having a concentration close to the middle value of the concentration measurement range, and the low-concentration sodium hypochlorite standard solution is a sodium hypochlorite standard solution having a zero concentration.
Preferably, the sodium hypochlorite standard solution with zero concentration is deionized water.
Preferably, the obtaining of the slow decay time period of the sodium hypochlorite standard solution based on the first measurement data and the measurement time includes: and obtaining a concentration attenuation curve of the sodium hypochlorite standard solution based on the first measurement data and the measurement time, and selecting a time period corresponding to a continuous and flat partial curve in the concentration attenuation curve as a correction and measurement time period of the residual chlorine sensor to be measured.
Preferably, in the above aspect, a concentration decay range value corresponding to a continuous and flat partial curve in the concentration decay curve is less than 5%.
Preferably, the determining whether the measurement characteristic of the to-be-measured residual chlorine sensor is qualified based on the first measurement data, the second measurement data and the maximum allowable error includes: and judging whether the actual measurement characteristic fitted curve and the actual concentration value fitted concentration curve exceed the maximum allowable error range based on the concentration curve fitted by the high, medium and low three-point actual concentration values obtained by the first measurement data and the actual measurement characteristic fitted curve of the residual chlorine sensor to be measured obtained by the second measurement data.
As a preferable aspect of the above-described technical solution, the inspection method further includes: and judging the consistency or the dispersity of the measurement result of the residual chlorine sensor to be detected.
As a preferable aspect of the above technical solution, the determining the consistency or dispersibility of the measurement result of the to-be-measured residual chlorine sensor includes: and obtaining an average value of the second measurement data through a plurality of groups of second measurement data with the same concentration, obtaining a characteristic parameter through the second measurement data and the average value of the second measurement data, and judging the consistency or the dispersity presented by the measurement result of the residual chlorine sensor to be measured through the characteristic parameter.
As a preferable aspect of the above-described technical solution, the inspection method further includes: and when the measurement characteristics of the residual chlorine sensor to be measured are judged to be qualified, the residual chlorine sensor to be measured is used as a comparison sensor.
The invention also provides a detection method for measuring stability of the residual chlorine sensor, which comprises the following steps: and (3) carrying out multiple times of inspection by using the inspection method according to any one of the above items within at least one set time period at set time intervals to obtain multiple groups of measurement data, fitting the multiple groups of measurement data to obtain a long-term working stability curve, and judging the measurement stability of the residual chlorine sensor based on the long-term working stability curve.
The invention provides a method for testing the measurement characteristics of a residual chlorine sensor, which comprises the steps of configuring sodium hypochlorite standard solutions with high, medium and low concentrations according to the concentration measurement range of the residual chlorine sensor to be tested, carrying out time-sharing point-by-point measurement on the sodium hypochlorite standard solutions with the three concentrations by a high-precision spectrophotometer, recording first measurement data and measurement time, obtaining a time period in which the sodium hypochlorite standard solutions are slowly attenuated by the first measurement data and the measurement time, taking the time period as the detection time period of the residual chlorine sensor to be tested, preventing the measurement error of the residual chlorine sensor to be tested due to the fact that the sodium hypochlorite standard solutions are excessively quickly attenuated, measuring the residual chlorine sensor to be tested on the high, medium and low concentrations respectively in the time period to obtain second measurement data, and judging whether the measurement characteristics of the residual chlorine sensor to be tested are qualified or not by the first measurement data, the second measurement data and the maximum allowable error, therefore, the device can be used for quickly and accurately detecting the measurement characteristics of the residual chlorine sensor when the measured aqueous medium is in a static state.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 shows a schematic diagram of the decay curve of a sodium hypochlorite standard solution in an example of the present invention;
FIG. 2 shows a schematic of a concentration curve fitted to true concentration values in an embodiment of the invention;
FIG. 3 shows a schematic of a concentration curve fitted to a true concentration value and a curve fitted to an actual measured property in an embodiment of the invention;
FIG. 4 is a diagram showing a long-term operation stability curve of a residual chlorine sensor to be measured in the embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for testing the measurement characteristics of a residual chlorine sensor, which comprises the following specific steps:
preparing sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration according to the concentration measurement range of the residual chlorine sensor to be measured;
respectively carrying out time-sharing point-by-point measurement on the prepared sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration by using a high-precision spectrophotometer, and recording measurement to obtain first measurement data and measurement time related to the content of residual chlorine;
obtaining a time period of slow attenuation of the sodium hypochlorite standard solution based on the first measurement data and the measurement time, and taking the time period of slow attenuation of the sodium hypochlorite standard solution as a time period of correction and measurement of the residual chlorine sensor to be measured;
respectively inserting the residual chlorine sensor to be measured into high-concentration, medium-concentration and low-concentration sodium hypochlorite standard solutions in the correction and measurement time periods to test so as to obtain second measurement data of the three sodium hypochlorite standard solutions about residual chlorine content;
and judging whether the measurement characteristics of the residual chlorine sensor to be measured are qualified or not based on the first measurement data, the second measurement data and the maximum allowable error.
In the method for testing the measurement characteristics of the residual chlorine sensor, sodium hypochlorite standard solutions with high, medium and low concentrations are configured according to the concentration measurement range of the residual chlorine sensor to be tested, then the sodium hypochlorite standard solutions with the three concentrations are respectively measured point by point in a time-sharing manner by a high-precision spectrophotometer, the first measurement data and the measurement time are recorded, a time period in which the sodium hypochlorite standard solutions are slowly attenuated can be obtained through the first measurement data and the measurement time, the time period is taken as the detection time period of the residual chlorine sensor to be tested, the measurement error of the residual chlorine sensor to be tested caused by the fact that the sodium hypochlorite standard solutions are excessively quickly attenuated is prevented, then the residual chlorine sensor to be tested is respectively measured for the high, medium and low concentrations in the time period to obtain second measurement data, and whether the measurement characteristics of the residual chlorine sensor to be tested are qualified or not is judged through the first measurement data, the second measurement data and the maximum allowable error, therefore, the device can be used for quickly and accurately detecting the measurement characteristics of the residual chlorine sensor when the measured aqueous medium is in a static state.
In a further embodiment of this embodiment, the method for testing the measured characteristic of the residual chlorine sensor further comprises: and when the measurement characteristic of the residual chlorine sensor to be measured is judged to be unqualified, correcting the indicating value of the second measurement data through the embedded system.
Specifically, embedded systems are arranged inside the residual chlorine sensor, the residual chlorine indicating value can be corrected through the embedded systems, and the measurement error of the residual chlorine sensor in the actual use process can be corrected.
In a further implementation manner of this embodiment, the high-concentration sodium hypochlorite standard solution is a sodium hypochlorite standard solution with a concentration close to the maximum value of the concentration measurement range, the medium-concentration sodium hypochlorite standard solution is a sodium hypochlorite standard solution with a concentration close to the concentration measurement range near the middle value, and the low-concentration sodium hypochlorite standard solution is a sodium hypochlorite standard solution with a concentration of zero.
The sodium hypochlorite standard solution of high concentration in this embodiment is the sodium hypochlorite standard solution that concentration is close to concentration measurement range maximum, the sodium hypochlorite standard solution of medium concentration is the sodium hypochlorite standard solution that concentration is close to concentration measurement range at the median, therefore its test range has covered its whole concentration measurement range, still set up zero point sodium hypochlorite standard solution simultaneously, can be used for testing the performance of the surplus chlorine sensor that awaits measuring, can obtain its measurement indicating value condition in the sodium hypochlorite standard solution that concentration is zero, in addition, still can also be convenient for survey and drawing various schematic diagrams more.
In a further embodiment of this embodiment, the sodium hypochlorite standard solution with zero concentration is deionized water.
The sodium hypochlorite standard solution in this embodiment is deionized water and can promote the accuracy of test.
In a further embodiment of this embodiment, obtaining the slow decay time period of the sodium hypochlorite standard solution based on the first measurement data and the measurement time comprises: and obtaining a concentration attenuation curve of the sodium hypochlorite standard solution based on the first measurement data and the measurement time, and selecting a time period corresponding to a continuous and flat partial curve in the concentration attenuation curve as a correction and measurement time period of the residual chlorine sensor to be measured.
In the embodiment, the correction and measurement time period of the residual chlorine sensor to be measured is obtained through the concentration decay curve, and the method can more accurately and quickly obtain the correction and measurement time period of the residual chlorine sensor to be measured.
The concentration decay curve of the sodium hypochlorite standard solution in this embodiment is shown in fig. 1, the ordinate of the concentration decay curve is the concentration value of the sodium hypochlorite standard solution measured by a high-precision spectrophotometer, the abscissa of the concentration decay curve is the measured time, and it can be known from the graph that t0To t1Is continuous anda flat partial curve.
In a further implementation manner of this embodiment, a concentration attenuation range value corresponding to a continuous and flat partial curve in the concentration attenuation curve is less than 5%.
In this embodiment, the concentration attenuation range value corresponding to the continuous and flat partial curve in the concentration attenuation curve is controlled within 5%, which not only improves the measurement accuracy, but also facilitates obtaining the continuous and flat partial curve.
See in particular fig. 1, t thereof0Corresponding concentration to t1The concentration attenuation of the concentration corresponding to the concentration is 5% or less, and it is needless to say that t is controlled for the purpose of improving convenience0Corresponding concentration to t1The corresponding concentration had a concentration decay equal to 5%.
In a further implementation manner of this embodiment, the determining whether the measurement characteristic of the residual chlorine sensor to be measured is qualified based on the first measurement data, the second measurement data and the maximum allowable error includes: and obtaining a concentration curve fitted with the actual concentration value based on the first measurement data, obtaining a curve fitted with the actual measurement characteristic based on the second measurement data, and fitting the curve fitted with the actual measurement characteristic and the concentration curve fitted with the actual concentration value to judge whether the range of the maximum allowable error is exceeded.
In the embodiment, whether the curve fitting the actual measurement characteristic and the concentration curve fitting the real concentration value exceed the maximum allowable error range is judged to determine the measurement characteristic condition of the residual chlorine sensor to be measured, so that the measurement characteristic condition of the residual chlorine sensor to be measured can be more accurately, quickly and more intuitively judged.
Referring to fig. 2, a schematic diagram of a concentration curve fitted to a true concentration value and a maximum allowable error range are shown, wherein an abscissa of the schematic diagram is an actual concentration of a sodium hypochlorite standard solution, an ordinate of the schematic diagram is an indication value of a residual chlorine sensor to be detected, and a dotted line parallel to the concentration curve fitted to the true concentration value is the maximum allowable error range.
Referring to fig. 3, a curve fitted with the actual measured characteristic is fitted to a concentration curve fitted with the true concentration value, wherein it can be seen from the figure that the curve 1 fitted with the actual measured characteristic is within the maximum allowable error range, while the curve 2 fitted with the actual measured characteristic is beyond the maximum allowable error range.
In a further implementation manner of this embodiment, the inspection method further includes: and judging the consistency or the dispersity of the measurement result of the residual chlorine sensor to be measured.
Specifically, the consistency or dispersion of the measurement results of the residual chlorine sensor to be measured can be evaluated by evaluating the consistency or dispersion of the measurement results (data) of the meter or the sensor when the same quantity value is repeatedly measured for a plurality of times, and further, the credibility of any one quantity value measured by the residual chlorine sensor to be measured in the case of measuring only once can be judged.
In a further implementation manner of this embodiment, the determining the consistency or the dispersivity of the measurement result of the residual chlorine sensor to be measured includes: and obtaining an average value of the second measurement data through a plurality of groups of second measurement data with the same concentration, obtaining a characteristic parameter through the second measurement data and the average value of the second measurement data, and judging the consistency or the dispersity presented by the measurement result of the residual chlorine sensor to be measured through the characteristic parameter.
In the embodiment, the consistency or the dispersity of the measurement result of the to-be-measured residual chlorine sensor is judged through the characteristic parameters, so that the consistency or the dispersity of the measurement result of the to-be-measured residual chlorine sensor can be accurately and quickly obtained.
Specifically, when the sodium hypochlorite standard solutions with three concentrations are repeatedly measured for multiple times, the second measurement data of each concentration of the sodium hypochlorite standard solutions can be acquired for 5-10 times, wherein N is 5-7, the average value of the second measurement data is calculated, and the average value calculation formula is
N is 5-7, and then the characteristic parameter is calculated based on the average value, and the calculation formula is
The characteristic parameter is used for evaluating that when the same quantity value is measured repeatedly for a plurality of times,consistency or dispersion of meter or sensor measurements (data). If the value is small, then the confidence level will be higher if it is used to measure any one value (e.g., only once), and weaker if not.
In a further implementation manner of this embodiment, the inspection method further includes: and when the measurement characteristic of the residual chlorine sensor to be measured is judged to be qualified, taking the residual chlorine sensor to be measured as a comparison sensor.
The qualified residual chlorine sensor that awaits measuring of detection can further satisfy the demand that detects at the actual operation process as comparing the sensor in this embodiment, can save time, promotes and detects the precision.
Specifically, when the qualified residual chlorine sensor is used in a water quality detection field for a period of time, the sensor needs to be corrected and compared. On the water quality detection site, a new chlorine residue sensor qualified for inspection and a chlorine residue sensor used for a period of time are used for measurement and comparison in the same static water to be detected (the measurement results of the two sensors are simultaneously read by a special tool), if the difference of the measurement results of the two sensors is found to exceed a specified value, the compared sensor is taken back for repair, otherwise, the sensor is continuously used.
In the embodiment, the long-term working stability index of the residual chlorine sensor can be obtained by measuring for many times every several hours or days according to the same method. Through the inspection and evaluation, the long-term working stability of the residual chlorine sensor to be detected can be identified.
In another aspect, the present invention provides a method for detecting measurement stability of a residual chlorine sensor, including: and (3) carrying out multiple tests by any one of the test methods within at least one set time period at set time intervals to obtain multiple groups of measurement data, fitting the multiple groups of measurement data to obtain a long-term working stability curve, and judging the measurement stability of the residual chlorine sensor based on the long-term working stability curve.
Specifically, the set time interval may be selected as needed, such as several hours or one day.
Referring to fig. 4, a schematic diagram of a long-term working stability curve of the to-be-measured residual chlorine sensor is shown, from which the working stability of the to-be-measured residual chlorine sensor in the long-term use process can be determined, a stability index interval is between two dotted lines, and when the long-term working stability curve is located between the stability index intervals, the working stability of the to-be-measured residual chlorine sensor in the long-term use process is proved to be better.
In summary, in this embodiment, when the online water quality detection is in a static state, the corresponding method is adopted to ensure the accuracy and reliability of the measurement of the residual chlorine sensor;
in addition, a sodium hypochlorite standard solution is established in the embodiment, quantity value transmission and tracing are carried out, and the quality characteristics of the residual chlorine sensor are inspected and evaluated;
in addition, in the embodiment, the qualified to-be-detected residual chlorine sensor is used as a comparison sensor, so that the on-site residual chlorine sensor can be corrected conveniently.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (11)
1. A method for testing the measurement characteristics of a residual chlorine sensor is characterized by comprising the following steps:
preparing sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration according to the concentration measurement range of the residual chlorine sensor to be measured;
respectively carrying out time-sharing point-by-point measurement on the prepared sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration by using a high-precision spectrophotometer, and recording measurement to obtain first measurement data and measurement time related to the content of residual chlorine;
obtaining a time period of slow decay of the sodium hypochlorite standard solution based on the first measurement data and the measurement time, and taking the time period of slow decay of the sodium hypochlorite standard solution as a time period of correction and measurement of the residual chlorine sensor to be measured;
respectively inserting the residual chlorine sensor to be measured into sodium hypochlorite standard solutions with high concentration, medium concentration and low concentration in the correction and measurement time periods to test so as to obtain second measurement data of the three sodium hypochlorite standard solutions about the residual chlorine content;
and judging whether the measurement characteristics of the residual chlorine sensor to be measured are qualified or not based on the first measurement data, the second measurement data and the maximum allowable error.
2. The method for testing a measured characteristic of a residual chlorine sensor according to claim 1, further comprising: and correcting the indicating value of the second measurement data through the embedded system when the measurement characteristic of the residual chlorine sensor to be measured is judged to be unqualified.
3. The method for testing the measurement characteristics of a residual chlorine sensor according to claim 1, wherein the high-concentration sodium hypochlorite standard solution is a sodium hypochlorite standard solution having a concentration close to the maximum value of the concentration measurement range, the medium-concentration sodium hypochlorite standard solution is a sodium hypochlorite standard solution having a concentration close to the concentration measurement range and around a middle value, and the low-concentration sodium hypochlorite standard solution is a sodium hypochlorite standard solution having a concentration of zero.
4. The method for testing the measurement characteristics of a residual chlorine sensor according to claim 3, wherein the sodium hypochlorite standard solution with zero concentration is deionized water.
5. The method for testing the measurement characteristics of a residual chlorine sensor according to claim 1, wherein the obtaining a time period during which the decay rate of the sodium hypochlorite standard solution is slow based on the first measurement data and the measurement time comprises: and obtaining a concentration attenuation curve of the sodium hypochlorite standard solution based on the first measurement data and the measurement time, and selecting a time period corresponding to a continuous and flat partial curve in the concentration attenuation curve as a correction and measurement time period of the residual chlorine sensor to be measured.
6. The method for testing the measurement characteristics of a residual chlorine sensor according to claim 5, wherein the concentration decay range value corresponding to the continuous and flat partial curve in the concentration decay curve is less than 5%.
7. The method for inspecting the measured characteristics of a residual chlorine sensor according to claim 1, wherein said judging whether the measured characteristics of the residual chlorine sensor to be measured are qualified based on the first measured data, the second measured data and the maximum allowable error comprises: and judging whether the actual measurement characteristic fitted curve and the actual concentration value fitted concentration curve exceed the maximum allowable error range based on the concentration curve fitted by the high, medium and low three-point actual concentration values obtained by the first measurement data and the actual measurement characteristic fitted curve of the residual chlorine sensor to be measured obtained by the second measurement data.
8. The method for testing a measured characteristic of a residual chlorine sensor according to claim 1, further comprising: and judging the consistency or the dispersity of the measurement result of the residual chlorine sensor to be detected.
9. The method for inspecting measurement characteristics of a residual chlorine sensor according to claim 8, wherein said judging the consistency or dispersion of the measurement results of the residual chlorine sensor to be measured comprises: and obtaining an average value of the second measurement data through a plurality of groups of second measurement data with the same concentration, obtaining a characteristic parameter through the second measurement data and the average value of the second measurement data, and judging the consistency or the dispersity presented by the measurement result of the residual chlorine sensor to be measured through the characteristic parameter.
10. The method for testing a measured characteristic of a residual chlorine sensor according to claim 1, further comprising: and when the measurement characteristics of the residual chlorine sensor to be measured are judged to be qualified, the residual chlorine sensor to be measured is used as a comparison sensor.
11. A detection method for measuring stability of a residual chlorine sensor is characterized by comprising the following steps: obtaining a plurality of sets of measurement data through a plurality of tests by the test method according to any one of claims 1 to 10 at set time intervals within at least a set time period, fitting the plurality of sets of measurement data to obtain a long-term operation stability curve, and judging the measurement stability of the residual chlorine sensor based on the long-term operation stability curve.
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