CN110794108B - Automatic detection method and device for state of liquid monitoring sensor - Google Patents
Automatic detection method and device for state of liquid monitoring sensor Download PDFInfo
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- CN110794108B CN110794108B CN201911123898.0A CN201911123898A CN110794108B CN 110794108 B CN110794108 B CN 110794108B CN 201911123898 A CN201911123898 A CN 201911123898A CN 110794108 B CN110794108 B CN 110794108B
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- 239000007788 liquid Substances 0.000 title claims abstract description 246
- 238000012544 monitoring process Methods 0.000 title claims abstract description 127
- 238000001514 detection method Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 32
- 229910052760 oxygen Inorganic materials 0.000 claims description 32
- 239000001301 oxygen Substances 0.000 claims description 32
- 239000008399 tap water Substances 0.000 claims description 6
- 235000020679 tap water Nutrition 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 2
- 238000010926 purge Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 27
- 230000008569 process Effects 0.000 description 13
- 238000001228 spectrum Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 230000004913 activation Effects 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention discloses an automatic detection method and device for the state of a liquid monitoring sensor, wherein the method comprises the following steps: collecting liquid: collecting liquid into a flow cell, wherein at least one monitoring sensor is arranged in the flow cell and positioned in the liquid; measuring various parameters of the liquid: at least one monitoring sensor is respectively corresponding to each parameter in the measured liquid; detecting a state of the sensor: the parameter of the at least one monitoring sensor for testing the liquid when the liquid is positioned at the first liquid level is a first measured value, the parameter of the at least one monitoring sensor for testing the liquid when the liquid is positioned at the second liquid level is a second measured value, the first measured value is compared with the second measured value or the first measured value is compared with the standard value of the standard medium, and the state of the at least one sensor is judged according to the comparison result. And (5) evacuating and cleaning: the flow cell is emptied of liquid and purged. The invention solves the problems of low maintenance efficiency and high cost caused by manual maintenance of the state of the liquid monitoring sensor in the prior art.
Description
Technical Field
The invention relates to the technical field of monitoring, in particular to an automatic detection method and device for a state of a liquid monitoring sensor.
Background
The water quality monitoring sensor is used as one of liquid monitoring sensors and is widely applied to the field of water quality monitoring in signal acquisition. There are many kinds of water quality monitoring sensors, such as dissolved oxygen, turbidity, PH, conductivity, temperature, UV method COD sensor, spectrum multiparameter and the like. Besides being used for water quality monitoring alone, the water quality monitoring sensor can also be integrated with other instruments (cabinet analyzers and the like) for use, and various parameters can be collected respectively and applied to water quality monitoring, so that the application field is very wide.
The existing sensor monitors water quality by arranging the sensor in a sampling pool, when water quality monitoring is needed, a water pumping sample enters the water pool, the sensor starts to test, and test data are uploaded to a controller to monitor the water quality. But the water quality sensor can cause inaccurate or even invalid measurement results due to contamination, drift and the like in the use process. Therefore, the state of the sensor itself is very important in the water quality monitoring process, and in order to realize the validity of the monitoring data of the sensor, the state of the sensor needs to be strictly detected.
The detection of the state of the sensor in actual use is generally achieved by regular maintenance, wherein the maintenance mainly comprises cleaning the sensor, replacing consumables, calibrating or comparing with other handheld meters. However, the maintenance methods are conventionally operated manually, and cannot automatically identify the fault states such as sensor contamination, failure and the like.
The state of the sensor is maintained by adopting the manual maintenance mode, so that the problems of 1. If the sensor is stained or drifted in the middle of two maintenance, the measurement result is inaccurate but can not be found in time, 2. The maintenance of the working state of the sensor can not be automatically realized in the water quality monitoring process, the maintenance efficiency is lower because of the need of additionally adding a maintenance program, 3. The cost for manual maintenance is high, and the balance of accurate data and the maintenance cost of the sensor is difficult to optimize.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides an automatic detection method and device for the state of a liquid monitoring sensor, which are used for providing the automatic detection method and device for the state of the maintenance sensor, which are simple, convenient, effective, accurate and low in cost.
According to one aspect of the present invention, there is provided an automatic detection method of a water quality monitoring sensor state, mainly comprising the steps of:
collecting liquid:
Collecting liquid into a flow cell, wherein at least one monitoring sensor is arranged in the flow cell and positioned in the liquid;
Measuring various parameters of the liquid:
the at least one monitoring sensor is respectively corresponding to each parameter in the measured liquid;
Detecting a state of the sensor:
The parameter of the at least one monitoring sensor when the liquid is at the first liquid level is a first measured value, the parameter of the at least one monitoring sensor when the liquid is at the second liquid level is a second measured value, the first measured value is compared with the second measured value or the first measured value is compared with the standard value of the standard medium, and the state of the at least one sensor is judged according to the comparison result.
And (5) evacuating and cleaning:
The flow cell is emptied of liquid and purged.
By the detection method, the state of the automatic detection sensor is realized by comparing the two measured values of the sensor in the standard medium when the liquid is positioned at the first liquid level and the second liquid level in the liquid descending process or comparing the measured value of the sensor positioned at the first liquid level and the sensor positioned in the standard medium in the liquid descending process with the standard value of the standard medium.
The detection method of the invention further comprises the following steps: before the state of the detection sensor, the starting valve is opened, liquid is discharged until the at least one monitoring sensor is located in the standard medium and the liquid is located at a first liquid level, a first measured value is obtained, the first measured value is fed back to the controller, liquid is continuously discharged until the at least one monitoring sensor is located in the standard medium and the liquid is located at a second liquid level, a second measured value is obtained, and the second measured value is fed back to the controller.
By the detection method, the state of the sensor can be automatically detected without taking the sensor out of the flow cell and adding other additional cost, and the first measured value and the second measured value can be automatically and timely obtained in the process of discharging liquid.
The detection method of the invention further comprises the following steps: the standard medium comprises air or tap water for cleaning.
By the detection method, other auxiliary mediums are not required to be added, and the automatic detection sensor is directly realized by comparing two measured values of the sensor in the air or comparing one measured value with an air standard value when the liquid is positioned at different liquid levels in the liquid level descending process; or the automatic detection sensor is realized by utilizing the comparison of two measured values of the sensor in the tap water for cleaning or the comparison of one measured value and the standard value of the tap water for cleaning when the sensor is positioned at different liquid levels in the liquid descending process in the process of using the tap water for cleaning for washing the liquid.
The detection method of the invention further comprises the following steps: the at least one monitoring sensor is at least one of a dissolved oxygen sensor, a conductivity sensor, a UV method COD sensor and/or a spectrum multi-parameter sensor;
The first measured value comprises dissolved oxygen, conductivity, ultraviolet rays and/or spectrum of air, and the standard value of the standard medium comprises the standard value of the dissolved oxygen, conductivity, ultraviolet rays and/or spectrum of air;
the monitoring sensor is in a normal state when the difference between the first measured value and the standard value of dissolved oxygen, conductivity, ultraviolet light and/or spectrum in the air is within a tolerance d1, otherwise, the monitoring sensor is in fault.
By the detection method, the states of the dissolved oxygen sensor, the conductivity sensor, the UV method COD sensor and the spectrum multiparameter sensor can be automatically detected by comparing the actual value of the standard medium and the standard value of the standard medium which are automatically tested by the dissolved oxygen sensor, the conductivity sensor, the UV method COD sensor and/or the spectrum multiparameter sensor.
The detection method of the invention further comprises the following steps: when the at least one monitoring sensor is a turbidity sensor;
the first liquid level is the intersection point position of a transmitting light path and a 90-degree receiving light path of the turbidity sensor;
And when the difference value between the first measured value of the first liquid level and the second measured value of the second liquid level is larger than a threshold value d2, the state of the turbidity sensor is normal, and otherwise, the turbidity sensor fails.
By the detection method, the turbidity sensor automatically tests the state of the liquid at the first liquid level, and the measured value at the intersection point of the sensor transmitting light path and the 90-degree receiving light path is compared with the test value of the standard medium.
The detection method of the invention further comprises the following steps: before the state of the detection sensor, the liquid level of the liquid is set at a position larger than the intersection point of the turbidity sensor, the liquid is continuously lowered by opening the starting valve, the turbidity sensor continuously measures, the maximum value measured by the turbidity sensor is the intersection point position value, the maximum value is a first measured value corresponding to the first liquid level and the sensor in the standard medium.
By the detection method, the position of the intersection point can be found more easily and quickly, the first liquid level is determined, and the turbidity sensor is used for measuring the parameters of the liquid at the first liquid level.
The detection method of the invention further comprises the following steps: the at least one sensor is a dissolved oxygen sensor, a conductivity sensor, and a PH sensor. And simultaneously arranging the dissolved oxygen sensor, the conductivity sensor and the PH sensor in the liquid, respectively and simultaneously carrying out temperature test on the liquid, generating temperature measurement values, comparing each generated temperature measurement value, and when all the difference values are lower than the set temperature difference d2t, ensuring that the states of the three sensors are normal.
By the detection method, the state of the sensor can be automatically detected by utilizing the comparison of temperature measured values of the dissolved oxygen sensor, the conductivity sensor and the PH sensor in the same environment without taking out the sensor from the liquid.
The detection method of the invention further comprises the following steps: according to another aspect of the invention, there is provided that the sensor is air purged or scraped clean prior to detecting the condition of the sensor.
By the detection method, residues of liquid on the sensor can be avoided, and accuracy of a sensor test result is affected.
According to another aspect of the present invention, there is provided an automatic detection apparatus for detecting a state of a liquid monitoring sensor, comprising:
the side wall of the flow cell is provided with an opening, and the flow cell is used for circulating liquid;
At least one liquid monitoring sensor disposed on the side wall of the flow cell, the at least one monitoring sensor for measuring measurements of liquids at different levels and the monitoring sensor in a standard medium;
the starting valve is arranged at the opening of the flow cell and is used for controlling the liquid level of liquid in the flow cell;
and the output end of the central controller is connected with the starting valve and controls the starting valve to be opened.
Through the automatic detection device, the starting valve controls the liquid level of the liquid in the flow cell, so that the monitoring sensor has a certain position relationship with the liquid level of the liquid. Specifically, when the liquid is at the first liquid level and the monitoring sensor is in the standard medium, the first measured value of the monitoring sensor is compared with the second measured value of the monitoring sensor when the liquid is at the second liquid level and the monitoring sensor is in the standard medium, or when the liquid is at the first liquid level and the monitoring sensor is in the standard medium, the first measured value of the monitoring sensor is compared with the standard value of the standard medium, and whether the state of the monitoring sensor is normal or not can be detected. The technical problem that the accuracy of the measured liquid parameters between two manual tests cannot be known in time because the state of the monitoring sensor cannot be detected in time due to the inconvenience that the state test can be carried out only after the monitoring sensor is taken out of liquid in the traditional mode is avoided.
The detection device of the present invention is further provided with: the detection device further comprises a liquid level sensor, wherein the liquid level sensor is arranged on the side wall of the flow cell and used for detecting the liquid level of the liquid in which the monitoring sensor is positioned and sending a detected liquid level signal to the central controller.
Through the automatic detection device, the liquid level sensor detects the liquid level of the monitoring sensor in the liquid and sends detection data to the central controller, so that the monitoring of the liquid level of the monitoring sensor is realized.
The detection device of the present invention is further provided with: the second input end of the central controller is connected with at least one liquid monitoring sensor and is used for recording a first measured value of a first liquid level and a second measured value of a second liquid level output by the monitoring sensor, calculating a difference value between the first measured value and the second measured value and generating a control signal according to the calculated difference value.
Through the automatic detection device, the central controller automatically records measurement data, calculates the difference between two adjacent measurement values, and is more convenient and efficient in detection.
The detection device of the present invention is further provided with: the second input end of the central controller is connected with at least one liquid monitoring sensor and is used for recording a first measured value of a first liquid level output by the monitoring sensor, calculating a difference value between the first measured value and a standard value of a standard medium and generating a control signal according to the calculated difference value.
Through the automatic detection device, the central controller automatically records measurement data, calculates the difference between the measurement value and the standard value, and is more convenient and efficient in detection.
In summary, the invention has the following beneficial effects:
compared with the prior art, the technical scheme of the invention has the following advantages:
(1) By adopting the automatic detection method and the automatic detection device of the water quality monitoring sensor, the state of the sensor is automatically and accurately detected simply and efficiently by arranging the starting valve and adding the detection step under the condition of not increasing the cost.
(2) The state of the sensor can be automatically detected in the liquid discharge process after the sensor detects various parameters, and the accuracy of various parameters of liquid detected before the sensor can be timely obtained after the state detection of the sensor is completed. The problem that in the traditional detection, the sensor is polluted or drifted in the middle of two times of manual maintenance, so that a measurement result is inaccurate and cannot be found in time is solved.
Drawings
FIG. 1 is a flow chart of an automatic detection method for the status of a liquid monitoring sensor according to an embodiment of the present invention;
FIG. 2 is a flow chart of another embodiment of an automatic detection method of the status of a liquid monitoring sensor according to the present invention;
FIG. 3 is a schematic flow chart of an embodiment of the method for automatically detecting the status of a dissolved oxygen sensor or a conductivity sensor according to the present invention;
FIG. 4 is a schematic flow chart of an embodiment of the method for automatically detecting the status of a turbidity sensor according to the present invention;
FIG. 5 is a schematic diagram of an automatic detection device for detecting the status of a liquid monitoring sensor according to the present invention;
FIG. 6 is a schematic functional diagram of an automatic detection device for detecting the status of a liquid monitoring sensor according to the present invention;
FIG. 7a is a schematic diagram showing a first state of the turbidity sensor as the monitoring sensor according to the present invention;
FIG. 7b is a schematic diagram showing a second state of the turbidity sensor as the monitoring sensor according to the present invention;
FIG. 8 is a schematic diagram of another functional structure of an automatic detection device for detecting the status of a liquid monitoring sensor according to the present invention;
Reference numerals: 100. an automatic detection device; 110. a flow cell; 120. monitoring a sensor; 121. a dissolved oxygen sensor; 122. a conductivity sensor; 123. a turbidity sensor; 150. starting a valve; 160. an overflow port; 170. a liquid; 171. a standard medium; FI. A first liquid level; f2, a second liquid level; 180. a blow-down valve; 190. a water inlet pump; 200. a central controller; 300. a liquid level sensor; 400. And a power supply module.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
Referring to fig. 1, fig. 1 shows a workflow diagram of an automatic detection method of a water quality monitoring sensor status of the present invention, the method comprising the steps of:
Step S100, collecting liquid, namely collecting the liquid into a flow cell, wherein at least one monitoring sensor is arranged in the flow cell, and the monitoring sensor is positioned in the liquid.
Specifically, the mode of collecting the liquid is not limited in this embodiment, and a person skilled in the art can select a corresponding method according to the actual requirement.
Step S200, measuring various parameters of the liquid, wherein each monitoring sensor is respectively corresponding to various parameters in the measured liquid.
Referring to fig. 5, at least one monitoring sensor 120 is disposed in the liquid 170, and each sensor is configured to measure each parameter of the liquid 170. For example, the monitoring sensor 120 is a dissolved oxygen sensor 121 and a conductivity sensor 122 for measuring dissolved oxygen and conductivity of the liquid, the monitoring sensor 120 is a turbidity sensor 123 for measuring turbidity of the liquid, and the monitoring sensor may be a PH sensor for measuring PH of the liquid. Of course the flow cell may also be provided with other types of sensors such as: and a UV method COD sensor, a spectrum multiparameter sensor and the like.
Specifically, the order of setting each sensor in the liquid is not limited in this embodiment, and a person skilled in the art can select the corresponding order and increase or decrease the types and the number of the sensors according to the actual requirements.
Step S300, detecting the state of the sensor, wherein the corresponding parameter when the at least one monitoring sensor tests the liquid to be positioned at the first liquid level is a first measured value, the parameter when the at least one monitoring sensor tests the liquid to be positioned at the second liquid level is a second measured value, comparing the first measured value with the second measured value or comparing the first measured value with the standard value of the standard medium, and judging the state of the at least one sensor according to the comparison result.
If the state of the sensor is normal, it may be determined that the test result of step S200 is accurate, and if the state of the sensor is faulty, it may be determined that the test result of step S200 is inaccurate.
Step S400, draining and cleaning, specifically, draining the liquid in the flow cell and cleaning the flow cell, so as to avoid the residue of the liquid in the flow cell or the contamination of the flow cell from affecting the next detection.
Further, referring to fig. 2, step S310 of obtaining the first measurement value and the second measurement value is further included before step S300.
Specifically, please refer to fig. 5 and fig. 7a together, wherein F1 is a first liquid level and 171 is a standard medium. Before detecting the state of the sensor, the start valve is opened, the liquid is discharged until the liquid is at the first level F1, and the monitoring sensor is located in the standard medium and measures a parameter, which is defined as a first measured value.
The liquid continuing to drain to liquid is at a second level F2 (fig. 7 b), and the monitoring sensor is located in the standard medium and measures a parameter, which is defined as a second measurement value.
The sensor feeds back the first measured value and the second measured value to the controller respectively, the controller records the measured values twice, the first measured value and the second measured value are compared or the first measured value and the standard value of the standard medium are compared, and the state of the monitoring sensor is judged according to the comparison result.
The standard medium used in the above embodiments is air, tap water for cleaning or other standard medium.
When the standard medium is air, the invention directly utilizes the comparison of two measurement values of the sensor in the air or the comparison of one measurement value and the standard air value when the liquid is positioned at different liquid levels in the liquid level descending process to judge the working state of the sensor.
When the standard medium is cleaning water, the cleaning water has a standard value like air, and each sensor is compared with the standard value of the cleaning water according to the measured value in the cleaning water, and the working state of the sensor is judged within the tolerance range.
The implementation of the solution according to the invention is illustrated below by means of specific examples of monitoring sensors, which should be understood by a person skilled in the art as not limiting the scope of the claims. The various sensors used in the examples are conventional liquid test sensors.
Example 1
Referring to fig. 3 and 5, the monitoring sensor used in the present embodiment is one or both of the dissolved oxygen sensor 121 and the conductivity sensor 122. The method for detecting the state of the monitoring sensor of the present embodiment is as follows:
in step S301, the dissolved oxygen sensor or the conductivity sensor detects the dissolved oxygen or the conductivity of the air to obtain a first measurement value, specifically, the sensor is controlled to be in the air by starting the valve, the liquid level of the liquid is at the first liquid level F1, the sensor measures the parameter of the air, and the obtained measurement value is the first measurement value. Wherein the first liquid level F1 is any position where the monitoring sensor is completely separated from the liquid.
In step S302, the first measured value is compared with a standard value of dissolved oxygen and/or conductivity in air, where the dissolved oxygen or conductivity in air is the standard value.
When the difference between the first measured value and the standard value of the dissolved oxygen and/or the conductivity in the air is within the tolerance d1, the state of the monitoring sensor is normal, and the test result in the step S200 is accurate. Specifically, d1 ranges from 10% of the monitoring sensor range.
When the difference between the first measured value and the standard value of dissolved oxygen and/or conductivity in the air is out of the tolerance range, the sensor malfunctions, and the test result in step S200 is wrong.
Example 2
Referring to fig. 4, 7a and 7b, the monitoring sensor used in the present embodiment is a turbidity sensor 123. The method for detecting the state of the monitoring sensor of the present embodiment is as follows:
In step S301', the turbidity sensor obtains a first measurement value, specifically, the first measurement value is measured by controlling the liquid to be located at the first liquid level by activating the valve, that is, the intersection point position of the turbidity sensor. Specifically, the first liquid level is the intersection point position of a transmitting light path and a 90-degree receiving light path of the turbidity sensor, and the turbidity sensor is positioned in a standard medium.
In step S302', the turbidity sensor is located at the second liquid level F2, and the turbidity of the air is measured to obtain a second measured value, specifically, the second measured value is obtained by starting the valve to control the liquid level to continue to drop below the liquid level F1, and the turbidity of the standard medium is measured by the sensor.
In step S303', the difference between the first measurement value and the second measurement value is compared with a preset threshold, where the preset threshold is d2.
When the difference between the first measurement value and the second measurement value is greater than the threshold value d2, the state of the monitoring sensor is normal, and the test result in step S200 is accurate.
When the difference between the first measurement value and the second measurement value is not greater than the threshold value d2, the monitoring sensor fails, and the test result in step S200 is incorrect.
Specifically, the threshold d2 is greater than 20% of the turbidity sensor range.
Further, the position of the intersection point in step S301' may be found by first starting the valve to control the liquid level of the liquid at a position greater than the intersection point of the turbidity sensor, opening the valve to continuously decrease the liquid and continuously measuring the turbidity sensor, wherein the maximum value measured by the turbidity sensor is the value of the intersection point, and monitoring the first measured value measured by the sensor.
Example 3
The monitoring sensors used in this example are dissolved oxygen sensors, conductivity sensors, and PH sensors. The method for detecting the state of the monitoring sensor of the present embodiment is as follows:
The dissolved oxygen sensor, the conductivity sensor and the PH sensor all need temperature compensation, so the temperature measuring function is realized. Before detecting the state of the sensor, simultaneously arranging the dissolved oxygen sensor, the conductivity sensor and the PH sensor in the liquid, and respectively and simultaneously measuring the liquid to perform temperature test; and generating temperature measured values, comparing each generated temperature measured value, and when all the difference values are lower than the set temperature difference d2t, the three sensors are in normal states. Otherwise, the sensor fails, wherein d2t can be set according to the actual parameters of the sensor, and specifically, the set temperature difference is the one with the largest temperature measurement precision among the three sensors.
According to the invention, the states of the UV method COD sensor and the spectrum multiparameter sensor are detected by comparing the first liquid level value with the value of the standard medium, so that the state of the sensor is obtained. Specifically, the state detection method of the UV method COD sensor and the spectrum multiparameter sensor comprises the following steps: the two sensors have a fixed value D20 when the instrument is just installed, and the value D20 is recorded by the sensor record. And comparing the measurement D21 and the measurement D20 of the first liquid level, wherein the sensor is normal when the difference value of the measurement D21 and the measurement D20 is within the range of the tolerance D1, and the range of D1 is 10% of the measuring range of the sensor. For specific detection methods, please refer to the method in embodiment 1, which is not described in detail in the present disclosure.
By the detection method, the state of the automatic detection sensor is realized by utilizing the two measured values of the sensor in the standard medium respectively when the liquid is positioned at the first liquid level and the second liquid level in the liquid descending process to compare the measured values of the sensor in the first liquid level and the sensor in the standard medium in the liquid descending process with the standard value of the standard medium. The detection method is simple and efficient, and can timely find out whether the test result in the step S200 is accurate or not.
Referring to fig. 5, fig. 5 shows a schematic structural diagram of an automatic detection device for a state of a liquid monitoring sensor according to the present invention. The automatic detection device 100 for the state of a liquid monitoring sensor according to the present invention includes: a flow cell 110, at least one liquid monitoring sensor 120, an activation valve 150, a liquid level sensor 300, and a central controller 200. Wherein the side wall of the flow cell 110 is provided with an opening (not shown), the flow cell 110 is used for containing and circulating the liquid 170.
An activation valve 150 is disposed at the opening of the flow cell 110, the activation valve 150 is used to control the level of the liquid in the flow cell 110, and the central controller 200 controls the opening of the activation valve 150.
Further, the automatic detection device further includes a liquid level sensor 300, and the liquid level sensor 300 is disposed in the flow cell 110, and is used for detecting the liquid level of the sensor 120 monitored by the flow cell 110 and transmitting the detected liquid level signal to the central controller 200.
Referring to fig. 6, fig. 6 is a schematic functional structure diagram of an automatic detection device for detecting a status of a liquid monitoring sensor according to the present invention. The first input end of the central controller 200 is connected with the liquid level sensor 300 and is used for receiving a liquid level signal sent by the liquid level sensor 300.
The automatic detection device further includes: and the alarm device 500 is connected with the central controller 200, and the alarm device 500 is used for receiving the control signal generated by the central controller 200 to generate an alarm.
In particular, the liquid level sensor is described as a pressure sensor. When the central controller 200 starts the status detection, the central controller 200 sends a signal to activate the valve 150 to open. While the pressure sensor constantly measures the liquid level and transmits a liquid level signal to the central controller 200. When the liquid level signal is the first liquid level (when the liquid level sensor 300 does not detect a signal that the monitoring sensor is submerged in liquid), the monitoring sensor 120 measures the first measured value and sends the measured value to the central controller 200.
As shown in fig. 5, a second input terminal of the central controller 200 is connected to the dissolved oxygen sensor 121 or the conductivity sensor 122, and is used for recording a first measured value of a first liquid level and a second measured value of a second liquid level (which are standard values of standard media and are pre-stored in the central controller) output by the dissolved oxygen sensor 121 and/or the conductivity sensor 122, and the central controller 200 calculates a difference value between the first measured value and the second measured value (the standard values of the standard media) and generates a control signal according to the calculated difference value. In fig. 5, the dissolved oxygen sensor 121 and the conductivity sensor 122 are compared with the standard value of the standard medium by the first measured value, and whether the state of the monitoring sensor 120 is normal or not can be known.
When the difference between the first measured value and the standard value of the dissolved oxygen and/or the conductivity in the air is within a tolerance d1, the state of the monitoring sensor is normal. Specifically, d1 ranges from 10% of the monitoring sensor range.
When the difference between the first measured value and the standard value of the dissolved oxygen and/or the conductivity in the air is out of the tolerance range, the monitoring sensor fails, and the central controller 200 sends a control signal to the alarm device 500 to control the alarm device 500 to alarm. The central controller 200 and the alarm device 500 may be connected wirelessly, so that a user may receive an alarm through a handheld electronic device such as a mobile phone.
Of course, the detection of the UV COD sensor and the spectrum multiparameter sensor is also suitable for the automatic detection device, and the detection modes of the dissolved oxygen sensor and the conductivity sensor can be specifically referred.
Referring to fig. 7a and 7b, fig. 7a and 7b illustrate first and second status diagrams of the turbidity sensor according to the present invention. Specifically, when the monitoring sensor is the turbidity sensor 123, the first liquid level is the intersection point position (pre-stored in the central controller) of the transmitting light path and the 90-degree receiving light path of the turbidity sensor 123, and the second liquid level is located at a position below the first liquid level. When the level sensor 300 detects a pressure value for the intersection position, the level sensor 300 sends a signal to the central controller 200. The turbidity sensor 123 measures the first measurement value and sends the measurement value to the central controller 200. At any point where the liquid level then continues to drop, the detection value of the turbidity sensor 123 is the second measurement value.
When the difference between the first measurement value and the second measurement value is greater than the threshold value d2, the turbidity sensor is in a normal state. When the difference between the first measured value and the second measured value is not greater than the threshold value d2, the turbidity sensor fails, and the central controller 200 transmits a control signal to the alarm device 500 to control the alarm device 500 to alarm. Specifically, the threshold d2 is greater than 20% of the turbidity sensor range.
The alarm device 500 of the present invention includes a speaker, buzzer, lights, and/or display screen. The user is reminded that the monitoring sensor has problems in a sound, light or screen display lamp mode, and maintenance or repair is needed.
Referring to fig. 8, the automatic detection device of the present invention further includes a water inlet pump 190 and a drain valve 180, wherein an output end of the central controller 200 is connected to input ends of the water inlet pump 190 and the drain valve 180, respectively, and the central controller 200 controls water pumping of the water inlet pump 190 and water discharging of the drain valve 180. The automatic detection device further comprises an overflow port 160 for preventing overflow of the liquid.
According to the automatic detection device for the state of the liquid monitoring sensor, provided by the invention, the liquid level of the liquid in the flow cell is controlled by the starting valve, so that the liquid is at different liquid levels, and the state of the automatic detection monitoring sensor is realized by comparing the two measured values of the monitoring sensor in the standard medium respectively when the liquid is at the first liquid level and the second liquid level in the liquid descending process or comparing the measured value of the liquid which is at the first liquid level and the sensor is at the standard medium with the standard value of the standard medium in the liquid descending process. The automatic detection device has a simple structure and is automatic, and the automation of the state detection of the liquid monitoring sensor is realized by arranging the central controller to control each device module.
Automated inspection the present invention has been further described with reference to specific embodiments thereof, but it should be understood that the detailed description is not to be construed as limiting the spirit and scope of the invention, as various modifications to the embodiments described above will become apparent to those of ordinary skill in the art upon reading the disclosure herein.
Claims (6)
1. An automatic detection method for the state of a liquid monitoring sensor is characterized by comprising the following steps:
collecting liquid:
Collecting liquid into a flow cell, wherein at least one monitoring sensor is arranged in the flow cell and positioned in the liquid;
Measuring various parameters of the liquid:
the at least one monitoring sensor is respectively corresponding to each parameter in the measured liquid;
Detecting a state of the sensor:
and (5) evacuating and cleaning:
Evacuating the flow cell of liquid and washing the flow cell;
when the at least one monitoring sensor is a turbidity sensor; the parameter of the at least one monitoring sensor when the liquid is at the first liquid level is a first measured value, the parameter of the at least one monitoring sensor when the liquid is at the second liquid level is a second measured value, the first measured value is compared with the second measured value, and the state of the at least one sensor is judged according to the comparison result; the first liquid level is the intersection point position of a transmitting light path and a 90-degree receiving light path of the turbidity sensor, the second liquid level is positioned below the first liquid level, and when the liquid is positioned at the first liquid level and the second liquid level, the turbidity sensor is positioned in the air; when the difference value between the first measured value of the first liquid level and the second measured value of the second liquid level is larger than a threshold value d2, the state of the turbidity sensor is normal, otherwise, the turbidity sensor fails; before the state of the detection sensor, setting the liquid level of the liquid at a position larger than the intersection point of the turbidity sensor, opening the starting valve to continuously decrease the liquid and continuously measuring the turbidity sensor, wherein the turbidity sensor measures a first measured value with the maximum value that the liquid is positioned at the first liquid level and the sensor is positioned in the air;
the at least one sensor is a dissolved oxygen sensor, a conductivity sensor and a PH sensor, the dissolved oxygen sensor, the conductivity sensor and the PH sensor are simultaneously arranged in the liquid to respectively and simultaneously test the temperature of the liquid, temperature measurement values are generated, each generated temperature measurement value is compared, and when all the difference values are lower than a set temperature difference d2t, the state of the sensor is normal.
2. The method of automatic detection of the status of liquid monitoring sensors according to claim 1, wherein prior to the status of the detection sensors, the start valve is opened, liquid is discharged until the at least one monitoring sensor is in air and the liquid is at a first level, a first measurement value is obtained, feedback is provided to the controller, liquid is continuously discharged until the at least one monitoring sensor is in air and the liquid is at a second level, a second measurement value is obtained, and feedback is provided to the controller.
3. The method for automatically detecting the state of a liquid monitoring sensor according to claim 1, wherein the sensor is subjected to air purging or brush cleaning before the state of the sensor is detected.
4. An automatic detection apparatus of a liquid monitoring sensor state for monitoring detection of a sensor state, for the automatic detection method of a liquid monitoring sensor state according to any one of claims 1 to 3, characterized in that: comprising the following steps:
the side wall of the flow cell is provided with an opening, and the flow cell is used for circulating liquid;
At least one monitoring sensor arranged on the side wall of the flow cell, wherein the at least one monitoring sensor is used for measuring the measured value of liquid under different liquid levels and the monitoring sensor is in air or tap water for cleaning;
the starting valve is arranged at the opening of the flow cell and is used for controlling the liquid level of liquid in the flow cell;
and the output end of the central controller is connected with the starting valve and controls the starting valve to be opened.
5. The automatic liquid monitoring sensor status detection device according to claim 4, further comprising a liquid level sensor disposed on a side wall of the flow cell for detecting a liquid level of the liquid in which the monitoring sensor is disposed, and transmitting the detected liquid level signal to the central controller.
6. The automatic detection device for a state of a liquid monitoring sensor according to claim 5, wherein: the second input end of the central controller is connected with at least one monitoring sensor and is used for recording a first measured value of a first liquid level and a second measured value of a second liquid level output by the monitoring sensor, calculating a difference value between the first measured value and the second measured value and generating a control signal according to the calculated difference value.
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