JPH07113631B2 - Water quality automatic measurement method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring water quality such as pH and conductivity of sample water.

[0002]

2. Description of the Related Art In factories, water is used for cooling water for maintenance of facilities and various other operations. For these waters, samples are taken from appropriate locations for facility management or environmental management, and the quality of the water (eg conductivity, pH, turbidity, components, etc.) is properly controlled within an appropriate range. Is being inspected. As this measuring device, for example, only the pH measurement is proposed, but there is a proposal in JP-A-64-80867. This is because when the sample container set in the pocket provided around the intermittently rotating turntable rotates to the specified position, the turntable is stopped, and the stirring rod is placed in the sample water inside the sample container from above the sample container. This sample water is rushed and stirred. When this stirring is completed, the turntable is further rotated to a predetermined position and stopped, and the measurement sensor is immersed in the sample water from above the sample container to measure only the pH of the sample water, and then the measurement sensor is washed with a washing machine. There is a device to wash at. Further, as the pH measuring sensor, as shown in FIG. 4, a reference electrode (saturated calomel electrode) 50 in which the electrode D ₁ is immersed in the KCl saturated solution Y ₁ in the thin glass tube G ₁ having the pores H at the lower end.
And the electrode D _{2 on} the HC1 saturated solution Y ₂ in the thin glass tube G ₂ .
The glass electrode (calomel electrode) 60 in which the
A glass electrode pH meter, which is a method of immersing in a glass electrode, is generally used.

[0003]

However, the above-mentioned Japanese Patent Laid-Open No.
The one described in JP-A No. 4-80867 is always exposed to air from the stage where the sample water is stored in the sample container to the pH measurement stage, and particularly when the sample water is stirred by the stirring rod, the sample water is It is extremely exposed to air. As a result, carbon dioxide gas in the air was dissolved in the sample water and reacted with hydrogen ions in the sample water to reduce the hydrogen ion concentration, so that accurate pH measurement could not be performed. Also, this pH
In addition to the measurement of the electric conductivity (measured by measuring the resistance value between two electrodes immersed in the sample water) in addition to the measurement of the electric conductivity, the electric conductivity decreases due to the reduction of the hydrogen ion concentration in the sample water. . Further, when the sample water is measured with the glass electrode pH meter, the KCl saturated solution Y ₁ is eluted into the sample water from the inside of the glass tube G ₁ through the pores H at the lower end of the reference electrode glass tube G ₁ , so that the ion The concentration increases and the conductivity of the sample water increases. As a result, it was impossible to measure the conductivity with high accuracy as in the case of the pH measurement. INDUSTRIAL APPLICABILITY The present invention minimizes the change in the ion concentration of sample water of water such as boiler water and blast furnace cooling water which tends to change in ion concentration when exposed to air (for example, boiler water, blast furnace wall circulation cooling water). It is an object of the present invention to accurately measure the electric conductivity and the pH by reducing the amount of the ion concentration so that it is not affected by the ion concentration even if it changes to some extent.

[0004]

[Means for Solving the Problems] Means for characterizing the present invention for solving the above-mentioned problems are to set a sample container containing sample water in a pocket provided around a turntable capable of intermittent rotation, and set the sample container at a predetermined position. Insert a sensor that measures the water quality such as conductivity and pH into the sample water in the sample container on the turntable that has been rotated, and convert the measurement signal from the measurement sensor into the water quality value such as conductivity and pH by the computer. In the automatic water quality measuring method, which is stored as
And the sample water is filled up, the mouth of the sample container is sealed with a thin film, the sealed sample container is set in the pocket of the turntable, and then the turntable is intermittently rotated. The sample container to reach the conductivity measuring position, where the knife cooperating with the conductivity measuring sensor breaks the thin film at the mouth of the sample container, and the measurement sensor washed with water from the breaking hole is inserted into the sample water. Then, after stirring the sample water by rotating the magnetic piece in the sample container by the magnet provided on the turntable before the conductivity measurement, the conductivity is measured by the conductivity measuring sensor, and further, The turntable is intermittently rotated to reach the pH measuring position of the sample container, the pH measuring sensor washed with water from the breakage of the thin film is inserted into the sample water, and the turntable is measured before pH measurement. After the sample water was stirred by rotating the magnetic body pieces in the sample container by providing magnets, the p
The H measurement sensor measures pH.

[0005]

Operation and Embodiments The operation of the present invention will be described below together with embodiments with reference to FIGS. In FIG. 1, 1 is a poly container as a sample container, 2 is a rotating piece made of a magnetic material such as stainless steel or iron, 3 is a thin film of vinyl having a thickness of about 10 μm, and 4 is a step for pressing the vinyl 3. It is an inner lid, has an opening 4b in the center of the recess 4a, and the recess 4a is fitted into the container opening 1a at the upper end of the plastic container 1 via the vinyl 3. 4c is an outer lid. 2 and 3 are devices for measuring conductivity, pH, and turbidity of sample water, and 5 is a rotary drive device M having a plurality of pockets P _{1 to} Pn for setting the poly container 1 around the upper surface. It is a turntable that rotates via the rotating shaft 5a. ₆₁ through ₃ provided below the respective pockets P ₁ to P ₃ of the turntable 5, a magnet rotated via the rotating shaft 6a in the rotation driving device N.
Reference numeral 7 denotes a holding device, which is an elevating / lowering driver 7a for elevating and lowering the support column 7b, a traverse driver 7c for traversing and moving the holding arm 7d provided at the upper end of the support column 7b, and hanging at the tip of the holding arm 7d. The holding member 7e holds the conductivity measuring sensor 9, the pH measuring sensor 10, and the turbidity measuring sensor 11 at equal intervals. 8 is fixed to the holding member 7e with the upper end fixed to the measuring sensors 9 to 11, and the measuring sensors 9 to 11 are washed with the washing water 17 introduced from the washing water pipe 16 provided with the pump 15. The cleaning nozzle 12 is a knife whose upper end is fixed to the holding member 7e, and holds it so that the position of the blade of the knife 12 is below the tip position of the conductivity measuring sensor 9. Thirteen
Is a water tank for storing cleaning water for dipping and cleaning the conductivity measuring sensor 9, pH measuring sensor 10, and turbidity measuring sensor 11, and 14 is a draining plate provided in the water tank 13. Reference numeral 18 is a bar code reader for reading the sample number (bar code) attached to the poly container 1 set in the pockets P _{1 to} Pn of the turntable 5, and 19 is for storing the sample number (bar code) read by the bar code reader 18. A personal computer that stores the measured values measured by the conductivity measuring sensor 9, the pH measuring sensor 10, and the turbidity measuring sensor 11 corresponding to the sample number, 20 is a rotation driving device M, N, a lifting driving device 7a, a traverse The drive device 7b is a sequencer for instructing to drive the pump G.

Next, the operation will be described. First,
The rotary piece 2 is loaded in the plastic container 1, and the sample water sampled therein is gently charged from the plastic container port 1a until it becomes full. Next, the vinyl 3 is placed in the container opening 1a of the plastic container 1, the inner lid 4 is placed thereon, the inner lid 4 is gently pushed down, and finally the outer lid 4c is placed in the analysis chamber (not shown). Transport. In this analysis room, a bar code is created for the poly container 1 containing the sample water that has been conveyed, the bar code is read by the bar code reader 18 and registered in the personal computer 19. Then, remove the outer lid 4c of the plastic container 1 is set to pocket P ₁ ~Pn of the turntable 5 in the order in which they finished the registration to the personal computer 19, to enter the set completion signal to the sequencer 20 when the set is complete. Thus, the sequencer 20 drives the rotation driving device M to move the turntable 5 step by step (one poly container).
In this way, when the rotation driving device M stops driving when the earliest poly container 1 set in the pocket P ₁ reaches the conductivity measuring position, the elevating driver 7a is driven by the instruction of the sequencer 20. Up the support pillar 7b (arrow A
Direction), the traverse driver 7c, the holding arm 7d, and the holding member 7e are lifted, and the tip portions of the measurement sensors 9 to 11 are pulled up from the cleaning liquid in the water tank 13. When the lifting drive of the lifting driver 7a is stopped, the pump G is driven to drive the cleaning water pipe 1
By supplying the washing water to the washing nozzle 8 through 6, the measuring sensors 9, 10, 11 are washed, and after a predetermined time, the pump G is stopped to stop the measuring sensors 9, 10, 11.
Stop cleaning the tip of 11.

Next, the traverse driver 7c is driven to move the holding arm 7d forward (in the direction of arrow C), and the measuring sensor 9 suspended and held by the holding member 7e is set in the pocket P ₁ of the turntable 5. When it reaches the top of the plastic container 1, it stops. Further, the lift driver 7a is driven in the opposite manner to lower the support column 7b (in the direction of arrow B), so that the opening 12b of the inner lid 4 is opened by the knife 12 held by the holding member 7e.
The vinyl 3 is broken through the plastic container 1 and the conductivity measuring sensor 9 together with the knife 12 from the broken portion.
Immerse in sample water and stop at the specified height. Then, by driving the rotary drive device N predetermined time by an instruction sequencer 20 by rotating the magnet ₆₁ through _3, the rotation piece plastic container 1 which is set in the pocket P ₁ located above the magnet 6 ₁ 2 is rotated to stir the sample water in the plastic container 1. A predetermined time after the rotation driving device N is stopped (time when the sample water in the plastic container 1 is in a substantially calmed state), the measured value measured by the conductivity measuring sensor 9 is input to the personal computer 19. The conductivity is calculated from the measured values and registered in the order of the barcodes registered in the personal computer 19.

Next, in response to a command from the sequencer 20, the holding device 7 and the operation opposite to the above, that is, the lifting drive 7a.
(Upward direction of arrow A) -backward drive of the traverse driver 7c (direction of arrow D) -lowering drive of the up-and-down drive 7a (direction of arrow B), and the tip of each measurement sensor 9-11. The water tank 13 is stopped while being immersed in the cleaning water. When this series of operations is completed, again by driving the rotary drive M is the command of the sequencer 20, the turntable 5 is rotated by one step, plastic container 1 which is set in the pocket P ₁ is pH measurement position, the pocket P _The plastic container 1 set to ₂ reaches the conductivity measurement position and stops. Thus,
In response to a command from the sequencer 20, in the same manner as described above, the rotation drive device N, the lift drive device 7a, the traverse drive device 7b, the pump 15
Is driven, and the pH measuring sensor 10 is immersed in the sample water in the plastic container 1 set in the pocket P ₁ through the damaged portion of the vinyl 3 to measure the pH of the sample water. On this occasion,
Similarly to the above, the vinyl 3 of the poly container 1 set in the pocket P ₂ is broken with the knife 12, and the conductivity measuring sensor 9 is immersed in the sample water from the broken portion, and the measured values from the measuring sensors 9 and 10 are measured. Is read into the personal computer 19. Further, the turbidity of the sample water is measured by the turbidity measuring sensor 11 in the same manner as described above. Do this one by one
The final sample of the poly container 1 set in the pocket Pn of the turntable 5 is repeatedly measured. When the turbidity of the sample water in the last plastic container 1 is measured by the turbidity measuring sensor 11, each part of each device is stopped in the initial state. Thus, after the sample water is stored in the poly container 1 and before the conductivity measuring sensor 9 is immersed in the sample water in the poly container 1, the sample water in the poly container 1 is sealed with vinyl 3. With the knife 12 only the minimum required for measurement
Since it does not break, contact with air can be suppressed to a minimum, so there is almost no change in hydrogen ions in the sample water, and there is almost no error in measuring conductivity or pH.
In addition, since the pH is measured after the conductivity is measured, the conductivity is accurately measured without being affected by the KCl saturated solution Y ₁ flowing out from the glass tubes G ₁ of the reference electrodes D ₁ and D ₂ of the pH measurement sensor 10. It becomes possible to measure the rate.

Further, as described above, each measuring sensor 9-
Since the sample water is agitated when 11 is immersed in the sample water in each plastic container 1, bubbles and cleaning water are not present in the measurement sensors 9 and 10, and accurate measurement can be performed. . This sample water is agitated by each measuring sensor 9
It was performed after immersing the tip parts of Nos. 11 to 11 in the sample water, but the present invention is not limited to this, and the tip parts of the measurement sensors 9 to 11 may be immersed in the sample water and stirred. Each sensor 9-
When 11 is located above the aquarium 13, each sensor 9
The washing water (pure water) sprayed from the washing nozzle 8 to -11 is washed over each sensor 9-11, the washing water after washing is collected in the water tank 13, and the overflow water is drained by a drain pipe (not shown). Discharge to the outside. Further, when the measurement of conductivity, pH and turbidity is completed as described above, the poly container 1 is removed from the turntable 5, the sample water is discarded, the inside is washed with pure water, and then stored.

[0010]

According to the present invention, the container opening of a plastic container is covered with a thin film (vinyl) immediately after sampling and is broken by a knife when measuring the conductivity, and a sensor for measuring conductivity, pH, etc. is provided from the broken portion. Since it is inserted, the sample water is hardly exposed to the air in the plastic container, and the measurement can be performed without lowering the hydrogen ion concentration in the sample water.
Furthermore, since the pH is measured after measuring the conductivity,
Since the measured conductivity value is not affected by KCl generated during the measurement, it becomes possible to measure the conductivity, pH, etc. of the sample water in the poly container with high accuracy, and the effect in this field is great. .

[Brief description of drawings]

FIG. 1 is a side sectional view of a plastic container,

FIG. 2 is a simplified side view of the measuring device,

FIG. 3 is a view taken along the line I-I of FIG.

FIG. 4 is a detailed explanatory diagram of a pH measuring sensor.

[Explanation of symbols]

1 in plastic container 2 rotation piece 3 Vinyl 4 lid 4a recess 4b hole 4c outer lid 5 turntable ₆₁ through ₃ magnets 5a, 6a rotating shaft 7 holding device 7a elevation drive unit 7b supporting columns 7c transverse driver 7d holding arm 7e Holding member 8 Washing nozzle 9 Conductivity measuring sensor 10 pH measuring sensor 11 Turbidity measuring sensor 12 Knife 13 Water tank 14 Drain plate 15 Pump 16 Washing water pipe 17 Washing water 18 Bar code reader 19 Personal computer 20 Sequencer P _{1 to} Pn Pocket M, N rotation drive device D ₁ , D ₂ reference electrode G ₁ , G ₂ glass tube Y ₁ , Y ₂ KCl saturated solution

Claims (1)

[Claims] 1. A sample container containing sample water is set in a pocket arranged around a turntable which can be rotated intermittently, and conductivity and pH are contained in the sample water in the sample container on the turntable which has rotated to a predetermined position. In a method for automatically measuring water quality, in which a sensor for measuring water quality such as water is inserted, and a measurement signal from the measurement sensor is converted into a water quality value such as conductivity and pH by a computer and stored, a magnetic piece is attached to the sample container. the collected water samples as well as input
Water is filled until it is full, the mouth of the sample container is sealed with a thin film, the sealed sample container is set in the pocket of the turntable, and then the turntable is intermittently rotated to position the sample container at the conductivity measuring position. Where the thin film of the mouth of the sample container is broken by a knife that cooperates with the conductivity measuring sensor, and the measurement sensor washed with water from the breaking hole is inserted into the sample water, and the turn is made before the conductivity measurement. After rotating the magnetic piece in the sample container by a magnet provided on the table to stir the sample water, the conductivity is measured by the conductivity measuring sensor, and then the turntable is intermittently rotated to obtain the sample. The pH measuring sensor, which was washed with water through the breakage of the thin film, was inserted into the sample water by bringing the container to the pH measuring position, and inside the sample container by the magnet provided on the turntable before pH measurement. After stirring the water sample by rotating the magnetic body pieces, water quality automatic measuring method characterized by measuring the pH in the pH measurement sensor.