JP6285073B1 - Optical water quality detector cleaning method and optical water quality detector cleaning system - Google Patents

Abstract

An object of the present invention is to improve a cleaning effect and prevent an increase in size and weight of a measurement probe. Reduce the burden on the workers associated with cleaning operations. The present invention relates to a method for cleaning an optical water quality detector 2 having a measurement window 3 that transmits measurement light that is in contact with the measurement liquid 1 and passes through the measurement liquid 1. The cleaning particles 7 are ejected together with the gas into the liquid 1 to be measured from the nozzle 4 provided toward the surface to generate a flow in which the gas, the cleaning particles 7 and the liquid 1 to be measured are mixed. The present invention relates to a method for cleaning an optical water quality detector that cleans the measurement window 3 by colliding with the measurement window 3. [Selection] Figure 4

Description

  The present invention relates to a cleaning method for an optical water quality detector having a measurement window that transmits measurement light that is in contact with the liquid to be measured and passes through the liquid to be measured, and a cleaning system for the optical water quality detector.

  Based on the absorbance of the liquid to be measured, the water quality of the liquid to be measured, such as SS (suspended substance amount), turbidity, BOD (biochemical oxygen demand), COD (chemical oxygen demand), TOC (total organisms) There is an optical water quality detector that detects carbon), nitrate nitrogen, nitrite nitrogen, and the like. This type of optical water quality detector irradiates the measurement liquid through the measurement window (cell window) in contact with the measurement liquid, and compares the measurement light before and after passing through the measurement liquid. The absorbance of the measurement solution is obtained. Therefore, it is necessary to keep the measurement window clean, and there are various cleaning methods and apparatuses.

  For example, in the optical water quality detector disclosed in Patent Document 1, the quartz glass on which the titanium oxide film is formed is reciprocated in parallel with the cell window and stopped for a predetermined time (for example, 10 minutes) while being lowered, Dirt adhering to the cell window is removed by a cleaning action by OH radicals.

  As another cleaning method, it is also known to provide a wiper device and wipe the cell window with the wiper. Furthermore, it is also widespread that the operator collects the optical water quality detector from the installation location and manually cleans the cell window.

JP-A-9-311105

  However, in the above-described cleaning method using a quartz glass with a titanium oxide film, it takes a long time to sufficiently obtain the cleaning effect by OH radicals, and the time required for cleaning becomes long. In addition, a large cleaning effect cannot be expected for a long cleaning time. Furthermore, it is necessary to provide a drive mechanism for reciprocating the quartz glass with a titanium oxide film in the vicinity of the cell window, which complicates the structure and increases the size and weight of the cell itself.

  Further, in the cleaning method in which the cell window is wiped by providing the wiper device, when the contaminants in the liquid to be measured are firmly attached to the cell window, the contaminants cannot be wiped off. Furthermore, it is necessary to provide a wiper drive mechanism near the cell window, which complicates the structure and increases the size and weight of the cell itself.

  Furthermore, in the method in which the operator manually cleans, it is necessary to collect the optical water quality detector from the installation location and to re-install it correctly at the installation location after cleaning, which takes time and effort. In particular, when the liquid to be measured is sewage such as sewage, the optical water quality detector itself is heavily soiled, requiring extra labor for recovery from the installation location, and the work becomes labor intensive.

  The present invention has been made to solve such a problem, can be cleaned in a short time, can improve the cleaning effect, without increasing the size and weight of the measurement probe, It is another object of the present invention to provide an optical water quality detector cleaning method and an optical water quality detector cleaning system capable of extremely reducing the burden on the operator.

  In order to achieve the above object, a cleaning method for an optical water quality detector according to an embodiment includes an optical water quality detector having a measurement window that transmits measurement light that is in contact with a measurement liquid and passes through the measurement liquid. A cleaning method, in which cleaning particles are ejected together with gas into a liquid to be measured from a jet port provided toward a measurement window to generate a flow in which the gas, the cleaning particles and the liquid to be measured are mixed, The measurement window is cleaned by impinging the flow on the measurement window.

  According to another embodiment of the optical water quality detector cleaning method, after a gas flow is generated in the flow channel that guides the gas to the ejection port, the cleaning particles are sucked into the flow channel by the gas flow. It is preferable that the liquid to be measured be ejected from the ejection port.

  According to another embodiment of the optical water quality detector cleaning method, after supplying the cleaning particles in the middle of the flow path for guiding the gas to the jet outlet, the gas flow is generated in the flow path and cleaned with the gas. It is preferable to eject the particles for measurement into the liquid to be measured.

  An optical water quality detector cleaning system according to an embodiment is directed to an optical water quality detector having a measurement window that transmits measurement light that is in contact with the liquid to be measured and passes through the liquid to be measured, and the measurement window. Connected to the nozzle, a pressure source that pressurizes the gas jetted from the jet into the liquid to be measured, a channel that leads the gas pressurized by the pressure source to the jet, and a midway in the channel Cleaning particle supply means for mixing the cleaning particles into the gas flow.

  In the cleaning system for an optical water quality detector according to another embodiment, as a cleaning particle supply means, a first container for storing cleaning particles, a first container, and a flow channel are communicated, and the flow channel is provided in the flow channel. A first mixing passage for sucking the cleaning particles in the first container by the generated gas flow and mixing the particles in the gas flow; and a first opening / closing means for opening and closing the first mixing passage. It is preferable to provide.

  In the cleaning system for an optical water quality detector according to another embodiment, as a cleaning particle supply means, a second container for storing cleaning particles, and the cleaning particles in the second container are moved to move into the flow path. It is preferable to include a second mixing path that leads to the second mixing path, and a second opening / closing means that opens and closes the second mixing path.

  It is preferable that the cleaning system for an optical water quality detector according to another embodiment includes an opening that allows the gas ejected from the ejection port to escape from the vicinity of the ejection port.

  According to the present invention, cleaning can be performed in a short time, the cleaning effect can be improved, the measuring probe is not increased in size and weight, and the burden on the operator can be extremely reduced. it can.

FIG. 1 is a schematic configuration diagram of a cleaning system for an optical water quality detector according to a first embodiment of the present invention. FIG. 2 is a diagram for explaining the principle of measurement of absorbance by an optical water quality detector. FIG. 3 is a plan view showing a spout of the optical water quality detector. 4 is a cross-sectional view of the optical water quality detector taken along line IV-IV in FIG. FIG. 5 is a schematic configuration diagram showing an installation state of the optical water quality detector. FIG. 6 is a schematic configuration diagram of a cleaning system for an optical water quality detector according to a second embodiment of the present invention.

  Next, embodiments of an optical water quality detector cleaning method and an optical water quality detector cleaning system according to the present invention will be described with reference to the drawings. The embodiments described below do not limit the present invention, and all the elements and combinations described in the embodiments are not necessarily essential to the solution means of the present invention. Absent. In the following description, a method for cleaning an optical water quality detector will be described in an embodiment of the optical water quality detector cleaning system.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a cleaning system for an optical water quality detector according to a first embodiment of the present invention.

  An optical water quality detector cleaning system (hereinafter referred to as a water quality detector cleaning system) measures the absorbance of the liquid 1 to be measured and measures its water quality, for example, SS (amount of suspended solids), turbidity, BOD (biochemical oxygen). (Required amount), COD (chemical oxygen demand), TOC (total organic carbon), nitrate water, nitrite nitrogen, etc. A jet port 4, a pressure source 5 that pressurizes the gas jetted from the jet port 4 into the liquid 1 to be measured, a channel 6 that guides the gas pressurized by the pressure source 5 to the jet port 4, and a channel 6 Is provided with cleaning particle supply means 8 for mixing the cleaning particles 7 in the gas flow.

  FIG. 2 is a diagram for explaining the principle of measurement of absorbance by an optical water quality detector. FIG. 3 is a plan view showing a spout of the optical water quality detector. 4 is a cross-sectional view of the optical water quality detector taken along line IV-IV in FIG.

  Hereinafter, the optical water quality detector 2 is shown in detail in FIGS. The optical water quality detector 2 has a measurement window 3 that transmits measurement light 9 a that is in contact with the measurement liquid 1 and passes through the measurement liquid 1. The optical water quality detector 2 of the present embodiment has a measurement window 3 that passes through the measurement liquid 1 and the measurement window 3 on the output side that transmits the measurement light 9a from the measurement probe 10 into the liquid 1 to be measured. An input-side measurement window 3 that transmits the light 9a into the measurement probe 10 is provided. The cylindrical measurement probe 10 of the optical water quality detector 2 is provided with a groove-like recess 10a passing through the upper portion in the width direction, and each measurement window 3, 3 has both side walls 10b, 10b of the recess 10a. Is provided. The measurement window 3 is made of glass having resistance such as quartz glass or sapphire glass.

  As shown later in FIG. 5, the measurement probe 10 is submerged in the liquid 1 to be measured. In this state, the recess 10a is filled with the liquid 1 to be measured. The concave portion 10a has a groove shape, and an upper portion of the concave portion 10a serves as an open portion 11 that allows the gas ejected from the ejection port 4 to escape from the vicinity of the ejection port 4.

  In the measurement probe 10, a light source 12 and a light receiving means 13 are provided. The light source 12 is disposed on one side of the recess 10a, and the light receiving means 13 is disposed on the opposite side of the recess 10a. The light source 12 generates light having a wavelength suitable for measurement. For example, a xenon lamp is used, but the present invention is not limited to this. The light 9 emitted from the light source 12 is split into measurement light 9a that crosses the recess 10a and comparison light 9b that bypasses the recess 10a by a spectroscopic means 14 such as a lens, for example. The light passes through the means 15 and is collected by the light collecting means 16 such as a lens and reaches the light receiving means 13. The light receiving means 13 detects the measurement light 9 a and the comparison light 9 b and outputs the signals to the controller 17. The controller 17 compares the signal of the measurement light 9a and the signal of the comparison light 9b to obtain the absorbance of the liquid 1 to be measured and measures the water quality of the liquid 1 to be measured.

  The jet nozzle 4 is provided in the bottom face 10c of the recessed part 10a, for example. However, the place where the jet nozzle 4 is provided is not limited to the bottom surface 10c, and may be provided in a place other than the bottom surface 10c as long as the flow (cleaning flow 30) generated as described later can collide with the measurement window 3. Moreover, in this embodiment, the jet nozzle 4 is provided for every measurement window 3, and each measurement window 3 can be each wash | cleaned.

  The pressure source 5 is, for example, a compressor, takes in outside air, pressurizes it, and sends it into the flow path 6. The pressure source 5 is operated by the controller 17. The upstream end 6 a of the flow path 6 is connected to the jet outlet 5 a of the pressure source 5, and the downstream end 6 b is connected to a flow path connection 18 provided in the measurement probe 10. The flow path connecting part 18 is connected to the branching part 20 through the flow path 19 in the measurement probe 10, and supplies the gas sent from the flow path 6 to the respective outlets 4 and 4. A first electromagnetic valve 21 and an ejector 22 are provided in the middle of the flow path 6 in order from the upstream side. The first electromagnetic valve 21 is opened and closed by the controller 17.

  The cleaning particle supply means 8 communicates the first container 23 storing the cleaning particles 7 with the first container 23 and the flow path 6, and the first container is generated by the flow of gas generated in the flow path 6. The first mixing passage 24 for sucking the cleaning particles 7 in the gas flow 23 and mixing it into the gas flow, and the first opening / closing means 25 for opening and closing the first mixing passage 24 are provided.

  The upstream end 24 a of the first mixing passage 24 is inserted into the first container 23, and the downstream end 24 b is connected to the ejector 22. The first container 23 is filled with the cleaning particles 7 up to a position higher than the upstream end 24 a of the first mixing passage 24. A suction passage 26 is connected to the first container 23 at a position higher than the cleaning particles 7. The suction passage 26 is provided with a check valve 27 that allows only the flow toward the first container 23, a dehumidifying means 28 that dehumidifies the outside air to be taken in, and a filter 29 that removes dust, dust, and the like in the outside air to be taken in. . The first opening / closing means 25 is, for example, an electric valve or a solenoid valve, and is provided in the middle of the first mixing passage 24. The first opening / closing means 25 is opened / closed by the controller 17.

The cleaning particles 7 are preferably relatively hard ceramic particles such as alumina, silicon carbide, and silicon nitride, and among these, alumina particles are more preferable. Further, when the particle diameter is increased, the cleaning effect can be expected to be improved. On the other hand, there is a possibility that the measurement window 3 may be damaged. Conversely, when the particle diameter is decreased, the possibility that the measurement window 3 is damaged decreases. This reduces the cleaning effect. Therefore, it is preferable to use ceramic powder having a maximum particle diameter D _max value of 11 microns or less, more preferably a D ₉₀ value close to the maximum particle diameter of 11 microns or less in the particle size distribution obtained by laser diffraction particle size distribution measurement. By using particles having such a particle size, both improvement in cleaning effect and prevention of scratching of the measurement window 3 can be achieved at a high level.

  FIG. 5 is a schematic configuration diagram showing an installation state of the optical water quality detector.

  The measurement probe 10 is attached to the lower end of an installation instrument 32 that is detachably fixed to the peripheral wall 31 a of the storage tank 31 and is submerged in the liquid 1 to be measured. The measurement probe 10 is installed with the opening side of the recess 10a facing in a substantially horizontal direction (the front side in FIG. 5). In this state, the side walls 10b and 10b of the recess 10a are substantially perpendicular to the water surface, and the gas ejected from the ejection port 4 can be moved away from the opening portion 11 by moving in the front direction of the drawing in FIG. it can. Since the side of each measurement window 3, 3 is an open portion 11, it is possible to prevent bubbles from adhering to the vicinity of each measurement window 3, 3. Moreover, since the opening direction of the recessed part 10a is made into directions other than a water surface (in this embodiment, it is a horizontal direction), it can reduce that the suspended | floating matter in water accumulates in the recessed part 10a. In this way, it is possible to prevent bubbles from adhering to the measurement windows 3 and 3 and deposits of suspended matter from affecting the measurement of the water quality of the liquid 1 to be measured.

  The optical water quality detector cleaning method according to the present invention implemented by such a water quality detector cleaning system includes a measurement window 3 that transmits measurement light 9a that is in contact with the measured liquid 1 and passes through the measured liquid 1. A cleaning method for an optical water quality detector 2 having a gas and a cleaning particle 7 by ejecting cleaning particles 7 together with a gas into a liquid 1 to be measured from an ejection port 4 provided toward the measurement window 3. The measurement window 3 is cleaned by generating a flow 30 (hereinafter referred to as a cleaning flow) in which the liquid to be measured 1 and the liquid 1 to be measured are mixed, and causing the cleaning flow 30 to collide with the measurement window 3. Further, in the present embodiment, as a method of ejecting the cleaning particles 7 together with the gas from the ejection port 4, a gas flow is generated in the flow path 6 that leads the gas to the ejection port 4, and then the gas flow is caused by the gas flow. The cleaning particles 7 are sucked into the passage 6 and ejected from the ejection port 4 into the measured liquid 1.

  In a state where cleaning is not performed, the first electromagnetic valve 21 is closed, the pressure source 5 is stopped, and the first opening / closing means 25 is closed. In this state, the gas and the cleaning particles 7 are not ejected from the two ejection ports 4 provided in the measurement probe 10. Therefore, it does not affect the water quality measurement of the liquid 1 to be measured.

  Washing is performed when the water quality of the liquid 1 to be measured is not measured. When cleaning is performed, first, the first electromagnetic valve 21 is opened, and air is pumped from the pressure source 5 (preferred pressure is 0.5 to 0.6 MPa. The same applies hereinafter), and the ejector 22 is turned on. A gas flow is generated in the containing flow path 6 and begins to be ejected vigorously from the ejection port 4 as it is. Thereafter, when the first opening / closing means 25 is opened, the cleaning particles 7 in the first container 23 are sucked into the first mixing passage 24 by the gas flow in the ejector 22. Along with this suction, outside air is sucked into the first container 23 from the suction passage 26, so that the cleaning particles 7 in the first container 23 are sucked into the first mixing passage 24 and moved into the ejector 22. And mixed into the gas flow. As a result, the gas to which the cleaning particles 7 are added is ejected vigorously from the ejection port 4 into the measured liquid 1, and the cleaning flow 30 in which the gas, the cleaning particles 7 and the measured liquid 1 are mixed is measured. Occurs in liquid 1. Since the jet nozzle 4 faces the measurement window 3, the cleaning flow 30 collides with the measurement window 3 vigorously and cleans the measurement window 3 (see FIG. 4).

  When the first electromagnetic valve 21 and the first opening / closing means 25 are closed from this state, the flow in which the gas in the flow path 6 and the cleaning particles 7 are mixed stops, so that the cleaning flow that collides with the measurement window 3 is stopped. 30 can also be stopped and cleaning can be terminated. The controller 17 automatically operates the water quality detector cleaning system according to a predetermined program. For example, the cleaning is automatically performed at a preset time period or according to a preset schedule. The controller 17 also performs automatic cleaning by a switch operation by an operator.

  In this embodiment, since a compressor is used as the pressure source 5, the strength (fastness) of the cleaning flow 30 can be controlled by adjusting its output, and the measurement window 3 is cleaned according to dirt. It can be performed. In addition, since the dehumidifying means 28 and the filter 29 are provided in the suction passage 26 for introducing the outside air into the first container 23, the cleaning particles 7 can be prevented from becoming a mass due to moisture, It can prevent the entry of dust and dirt.

  In the present embodiment, since the cleaning flow 30 in which the cleaning particles 7 are mixed is used, the dirt on the measurement window 3 can be easily removed. For example, even if there are deposits such as iron and manganese that cannot be removed without cleaning with a chemical solution on the surface of the measurement window 3, it can be easily removed. Therefore, the cleaning effect is excellent. Further, since particles are only mixed in the gas and liquid as the cleaning flow 30, the measurement window 3 is not greatly damaged. That is, both the improvement of the cleaning effect and the prevention of damage to the measurement window 3 can be achieved at a high level. Further, since a chemical reaction that requires a long time such as a cleaning action by OH radicals is not used, cleaning can be performed efficiently in a short time.

  Further, since it is not necessary to provide a driving means such as a wiper device around the measurement window 3, the measurement probe 10 is not increased in size and weight, and ease of handling is not impaired. In addition, the structure of the measurement probe 10 can be prevented from becoming complicated. Furthermore, since the measurement probe 10 can be cleaned without lifting it from the liquid 1 to be measured, it is more hygienic and requires less work time than when the operator lifts the measurement probe and performs manual cleaning. The load on the operator can be greatly reduced.

(Second Embodiment)
Next, an optical water quality detector cleaning method and an optical water quality detector cleaning system according to a second embodiment of the present invention will be described.

  FIG. 6 is a schematic configuration diagram of a cleaning system for an optical water quality detector according to a second embodiment of the present invention.

  In the water quality detector cleaning system shown in FIG. 6, the cleaning particle supply means 8 moves the second container 33 for storing the cleaning particles 7 and the cleaning particles 7 in the second container 33 to move the flow path 6. A second mixing passage 34 that leads to the inside and a second opening / closing means 35 that opens and closes the second mixing passage 34 are provided.

  The second mixing passage 34 of the present embodiment guides the cleaning particles 7 in the second container 33 into the flow path 6 by gravity, and is from a receiving container 36 provided in the middle of the flow path 6. The second container 33 is arranged at a higher position. Note that the means for moving the cleaning particles 7 in the second container 33 into the flow path 6 is not limited to the use of gravity, and a transfer means such as a conveyor may be provided, or the operator may perform manual work. You may move it with. The upstream end 34 a of the second mixing passage 34 is connected to the bottom of the second container 33, and the downstream end 34 b is connected to the top of the receiving container 36. The second opening / closing means 35 is a ball valve, for example, and is provided in the middle of the second mixing passage 34. The second opening / closing means 35 is opened / closed by an operator.

  In the optical water quality detector cleaning method according to the present invention implemented by such a water quality detector cleaning system, the gas is guided to the jet nozzle 4 as a method of jetting the cleaning particles 7 together with the gas from the jet nozzle 4. After supplying the cleaning particles 7 in the middle of the flow path 6, the supply path is closed, that is, the second opening / closing means 35 is closed, and a flow of gas is generated in the flow path 6 so that the cleaning particles 7 are combined with the gas. It is made to eject into the liquid 1 to be measured.

  In a state where cleaning is not performed, the first electromagnetic valve 21 is closed, the pressure supply from the pressure source 5 is stopped, and the first opening / closing means 25 is closed. In this state, the gas and the cleaning particles 7 are not ejected from the two ejection ports 4 provided in the measurement probe 10. Therefore, it does not affect the water quality inspection of the liquid 1 to be measured.

  Washing is performed when the water quality of the liquid 1 to be measured is not measured. When cleaning is performed, first, the second opening / closing means 35 is opened, and the cleaning particles 7 in the second container 33 are dropped into the container 36. After dropping a predetermined amount of the cleaning particles 7 into the container 36, the second opening / closing means 35 is closed, the first electromagnetic valve 21 is opened, and air is pumped from the pressure source 5. As a result, a gas flow is generated in the flow path 6 including the receiving container 36, and the cleaning particles 7 are mixed into the gas flow in the receiving container 36 and ejected vigorously into the measured liquid 1 from the ejection port 4. As a result, a cleaning flow 30 in which the gas, the cleaning particles 7 and the liquid 1 to be measured are mixed is generated. Since the jet nozzle 4 faces the measurement window 3, the cleaning flow 30 collides with the measurement window 3 vigorously and cleans the measurement window 3.

  In this state, when the first electromagnetic valve 21 is closed, the pumping from the pressure source 5 is stopped and the flow of the gas in the flow path 6 and the cleaning particles 7 is stopped, so that the cleaning flow 30 colliding with the measurement window 3 is stopped. Can also be stopped and cleaning can be terminated. In the present embodiment, the operator operates the pressure source 5, the first electromagnetic valve 21, and the second opening / closing means 35 to perform cleaning at an arbitrary timing.

  In this embodiment, since a compressor is used as the pressure source 5, the strength (fastness) of the cleaning flow 30 can be controlled by adjusting its output, and the measurement window 3 is cleaned according to dirt. It can be performed.

  Similarly to the first embodiment, in the second embodiment, the cleaning flow 30 in which the cleaning particles 7 are mixed is used, so that the dirt on the measurement window 3 can be easily removed. For example, even if there are deposits such as iron and manganese that cannot be removed without cleaning with a chemical solution on the surface of the measurement window 3, it can be easily removed. Therefore, the cleaning effect is excellent. Further, since particles are only mixed in the gas and liquid as the cleaning flow 30, the measurement window 3 is not greatly damaged. That is, both the improvement of the cleaning effect and the prevention of damage to the measurement window 3 can be achieved at a high level. Further, since a chemical reaction that requires a long time such as a cleaning action by OH radicals is not used, cleaning can be performed efficiently in a short time.

  Further, since it is not necessary to provide a driving means such as a wiper device around the measurement window 3, the measurement probe 10 is not increased in size and weight, and ease of handling is not impaired. In addition, the structure of the measurement probe 10 can be prevented from becoming complicated. Furthermore, since the measurement probe 10 can be cleaned without lifting it from the liquid 1 to be measured, it is more hygienic and requires less work time than when the operator lifts the measurement probe and performs manual cleaning. The load on the operator can be greatly reduced.

  The present invention can be used for water quality management and the like in a sewage treatment facility.

DESCRIPTION OF SYMBOLS 1 Liquid to be measured 2 Optical water quality detector 3 Measurement window 4 Jet outlet 5 Pressure source 6 Flow path which leads gas to a jet outlet 7 Cleaning particle 8 Cleaning particle supply means 9a Measurement light 11 Opening part 23 Cleaning particle First container 24 for storing First mixing passage 25 First opening / closing means 30 Cleaning flow 33 Second container 34 for storing cleaning particles Second mixing passage 35 Second opening / closing means

Claims (5)

A method of cleaning an optical water quality detector having a measurement window that transmits measurement light that is in contact with the liquid to be measured and passes through the liquid to be measured.
The cleaning particles are jetted together with the gas into the liquid to be measured from the jet port provided toward the measurement window to generate a flow in which the gas, the cleaning particles and the liquid to be measured are mixed, In the method of cleaning the measurement window by causing a flow to collide with the measurement window, after the gas flow is generated in the flow path that guides the gas to the ejection port, the flow path causes the flow path to flow. It said cleaning particles aspirated, the method of cleaning an optical quality detector Ru is ejected to the measured liquid from the ejection port within. A method of cleaning an optical water quality detector having a measurement window that transmits measurement light that is in contact with the liquid to be measured and passes through the liquid to be measured.
The cleaning particles are jetted together with the gas into the liquid to be measured from the jet port provided toward the measurement window to generate a flow in which the gas, the cleaning particles and the liquid to be measured are mixed, In the method of cleaning the measurement window by causing a flow to collide with the measurement window, after supplying the cleaning particles in the middle of the flow path that guides the gas to the ejection port, the gas flows into the flow path. the method of cleaning an optical Gakushiki water quality detector with the gas to generate a stream Ru is ejected the cleaning particles in the test solution. An optical water quality detector having a measurement window that transmits measurement light that is in contact with the liquid to be measured and passes through the liquid to be measured;
A spout provided toward the measurement window;
A pressure source for pressurizing a gas ejected from the ejection port into the liquid to be measured;
A flow path for guiding the gas pressurized by the pressure source to the ejection port;
Cleaning particle supply means connected in the middle of the flow path to mix cleaning particles into the gas flow,
Equipped with a,
The cleaning particle supply means includes
A first container for storing the cleaning particles;
A first mixture that communicates the first container and the flow path, and sucks the cleaning particles in the first container by the gas flow generated in the flow path and mixes the particles in the gas flow. Passage for,
First opening and closing means for opening and closing the first mixing passage;
An optical water quality detector cleaning system comprising: An optical water quality detector having a measurement window that transmits measurement light that is in contact with the liquid to be measured and passes through the liquid to be measured;
A spout provided toward the measurement window;
A pressure source for pressurizing a gas ejected from the ejection port into the liquid to be measured;
A flow path for guiding the gas pressurized by the pressure source to the ejection port;
Cleaning particle supply means connected in the middle of the flow path to mix cleaning particles into the gas flow,
With
The cleaning particle supply means includes
A second container for storing the cleaning particles;
A second mixing path for moving the cleaning particles in the second container and guiding the particles into the flow path;
Second opening and closing means for opening and closing the second mixing passage;
Cleaning system of the light Gakushiki water quality detector Ru comprising a. The cleaning system for an optical water quality detector according to claim 3 or 4 , further comprising an open part that allows gas ejected from the ejection port to escape from the vicinity of the ejection port.

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