JP6136570B2 - Water quality inspection device - Google Patents

Description

  The present invention relates to a water quality inspection apparatus. In particular, inspectors carry the water treatment equipment with circulating water systems such as boilers and cooling towers, environmental water such as rivers, lakes, and dams, factory treated water, and wastewater to the site. The present invention relates to a water quality inspection apparatus suitable for use.

  In the water quality test, a plurality of items such as pH, ion concentration, conductivity (electrical conductivity), turbidity, dissolved oxygen concentration, residual chlorine concentration, and water temperature are measured. As these measurement methods, the sampled test solution can be measured for each item using a tabletop or handy type pH meter, ion concentration meter, conductivity meter, etc., or at the site where the test solution exists. A method of immersing a detector equipped with a plurality of types of sensors in a test solution and measuring a plurality of items simultaneously is known.

  For example, Patent Document 1 discloses a desktop ion concentration meter that includes a plurality of measurement channels and can simultaneously measure pH and other ion concentrations. Patent Document 2 includes an immersion type sensor main body including a plurality of sensors for measuring water quality, and an instrument main body electrically connected to the sensor main body via a waterproof electric cable. A water quality analyzer is disclosed.

JP-A-6-88803 JP 2010-60376 A

  Sensors for water quality measurement, such as pH sensors, ion sensors, ORP (oxidation-reduction potential) sensors that measure the potential difference between electrodes immersed in a test solution, and the current flowing between electrodes immersed in a test solution There are various electrochemical sensors corresponding to the measurement items, such as a redox current measuring sensor (used for measuring dissolved oxygen concentration, residual chlorine concentration, etc.), conductivity cell, and the like. When a plurality of electrochemical sensors coexist in the same container, they may form a liquid circuit and interfere with each other, or the reference potential may be different, thereby affecting the measurement. Therefore, if these measurements are performed simultaneously, errors are likely to occur in the measurement results.

  In addition, some of the reference electrodes of a sensor that measures a potential difference such as a pH sensor, an ion sensor, and an ORP sensor electrically connect an internal solution and a test solution through a liquid junction. When measuring a test liquid in which such a sensor is immersed, there is an item that causes an error in the measurement result due to the composition of the test liquid changing with time due to the internal liquid flowing out from the liquid junction. . This problem is particularly noticeable in the measurement of conductivity. However, in the measurement of the oxidation-reduction current and the measurement of the ion concentration, there may be a problem depending on the relationship between the measurement target component and the component of the internal liquid.

In Patent Document 1, in order to prevent a difference in potential generated by each comparison electrode connected to a plurality of measurement channels or a difference in output impedance from affecting other channels, the switch means connects the comparison electrodes of each channel. Input terminals are separated or connected to each other to enable simultaneous measurement of a plurality of channels.
However, the method of Patent Document 1 has a problem that the influence on the measurement result due to the outflow of the internal liquid cannot be prevented.

  In Patent Document 2, in order to prevent the influence of the outflow of the internal liquid on the measurement result, the dissolved oxygen meter has an electrode mechanism composed of three electrodes, a working electrode, a counter electrode, and a reference electrode, and a potential of the working electrode with respect to the reference electrode. A potentiostat circuit that controls the potential of the counter electrode so as to be kept constant, and measures the amount of dissolved oxygen in the target liquid by measuring the amount of current flowing between the working electrode and the counter electrode Using a dissolved oxygen meter, the potentiostat circuit keeps the potential of the reference electrode at the ground potential of the potentiostat circuit and keeps the working electrode at a potential lower than the ground potential.

  However, the method of Patent Document 2 requires special control and complicates circuit design. Although it is conceivable to keep the reference electrode that flows out of the internal liquid away from other sensors without using the method of Patent Document 2, the apparatus becomes larger, so the circuit around the site where the test liquid exists exists. It is not suitable for application to a device that is used by an inspector. In addition, it is possible to shorten the measurement time and end the measurement before the influence of the internal solution appears. In this case, however, the measurement accuracy may deteriorate because it is not possible to wait until the sensor responds sufficiently. There is.

  In addition, when multiple sensors are mixed in the same container, the problem that they form a liquid circuit and interfere with each other can be considered by measuring each sensor in order at intervals. It is done. However, even in that case, processing such as operating the sensors one by one in order is necessary, the apparatus becomes complicated, and the measurement time becomes longer.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the compact and easy-to-handle water quality inspection apparatus which can perform an accurate water quality inspection with a simple structure in a short time.

In order to achieve the above object, the present invention employs the following configuration.
[1] A water quality test apparatus for performing a water quality test of a test liquid, wherein the test liquid is stored in the measurement container in which the test liquid is stored, and the test liquid is immersed in the test liquid stored in the measurement container. A plurality of sensors for performing a water quality test, and a partition for dividing the inside of the measurement container into a plurality of regions into which one or more of the sensors can be inserted, respectively, and separating test liquids contained in each region, Water quality inspection device equipped with.

[2] The plurality of sensors include a sensor that affects a measurement result of another sensor when inserted and measured in the same region, and the partition affects the measurement result of the other sensor. The water quality inspection apparatus according to [1], wherein an area in which a sensor to be applied is inserted and an area in which the other sensor is inserted are partitioned.

[3] The plurality of sensors include a sensor having a reference electrode having a liquid junction that electrically connects an internal liquid and the test liquid, and a component that flows out of the liquid junction. The water quality inspection apparatus according to [1] or [2], including a sensor of an item that causes an error in the measurement result due to a change in the composition of the liquid.

[4] A sensor that includes a pH sensor that measures the pH of the test solution as the sensor including the comparison electrode, and a sensor that measures the conductivity of the test solution as a sensor that causes an error in the measurement result. The water quality inspection apparatus according to [3], comprising a rate cell.

[5] The sensor having the reference electrode is inserted so that the maximum height of the liquid surface of the test solution contained in the first region where the sensor of the item causing the error in the measurement result is inserted. The height of the outer wall of the measurement container and the partition is designed so as to be higher than the maximum height of the liquid surface of the test solution stored in the second region [3] or [4] Water quality inspection equipment.

  The “maximum height of the liquid surface” means the maximum height from the installation surface that the liquid surface of the test liquid can take when the measurement container is installed on a horizontal installation surface. Specifically, it means the height from the installation surface of the liquid level when the test solution is fully squeezed with a measurement container and installed on a horizontal installation surface.

[6] The water quality inspection apparatus according to [5], wherein a first groove for overflowing the test solution stored in the first region is provided at an upper end portion of the partition wall.

[7] The upper end of the outer wall of the measurement container is provided with a second groove for overflowing the test solution stored in the second region [5] or [6]. Water quality inspection equipment.

  According to the present invention, it is possible to provide a compact and easy-to-handle water quality inspection apparatus capable of performing a highly accurate water quality inspection with a simple configuration in a short time.

1 is an external perspective view of a water quality inspection apparatus according to an embodiment of the present invention. It is a figure which shows the state which opened the sensor unit in FIG. It is the figure which saw through the sensor unit and the measurement container from the sensor unit side. It is a sectional side view of a sensor unit and a measurement container.

<Configuration of water quality inspection device>
Hereinafter, the water quality test | inspection apparatus 1 which concerns on one Embodiment of this invention using FIG. 1 thru | or FIG. 4 is demonstrated.

  As shown in FIGS. 1 and 2, the water quality inspection apparatus 1 includes an apparatus main body 2, a sensor unit 3, and a measurement container 4. The measurement container 4 is a container for storing a test liquid. The sensor unit 3 supports a plurality of sensors on the support surface 3 a and immerses the plurality of sensors in a test solution stored in the measurement container 4 to perform a water quality test on the test solution. The sensor unit 3 is connected to the apparatus main body 2 via a hinge portion (not shown).

  As shown in FIGS. 2 and 3, on the support surface 3a, a glass electrode 10, a first ion electrode 11, a second ion electrode 12, a comparison electrode 13, a composite sensor 15, and a temperature sensor are provided. 14 are supported.

  The glass electrode 10 and the comparative electrode 13 constitute a pH sensor 16. The first ion sensor 17 is composed of the first ion electrode 11 and the comparison electrode 13. The second ion sensor 18 is configured by the second ion electrode 12 and the comparison electrode 13.

  The pH sensor 16 measures the pH of the test solution by measuring the potential difference between the glass electrode 10 and the comparison electrode 13. The first ion sensor 17 and the second ion sensor 18 are included in the test liquid by measuring the potential difference between the first ion electrode 11 and the second ion electrode 12 and the comparison electrode 13, respectively. Measure the ion concentration of the specific ions.

  The comparison electrode 13 has a liquid junction portion 13a that brings the internal liquid into contact with the test liquid. The internal liquid is composed of, for example, a high concentration (3.3 mol / L) potassium chloride aqueous solution. In the comparison electrode 13, the internal liquid and the test liquid are electrically connected via the liquid junction 13a, and the internal liquid flows out little by little into the test liquid.

  The composite sensor 15 includes a conductivity cell (not shown) and a residual chlorine concentration sensor. The conductivity cell is an AC electrode type conductivity sensor. The residual chlorine concentration sensor is, for example, a polarographic residual chlorine concentration sensor using gold as a working electrode and silver as a counter electrode.

  The conductivity cell measures the conductivity of the test liquid by applying an AC voltage between a plurality of metal electrodes and measuring the current flowing between the electrodes. The residual chlorine concentration sensor measures the residual chlorine concentration in the test liquid by measuring the current flowing between the working electrode and the counter electrode.

  The current value measured by the conductivity cell and the residual chlorine concentration sensor varies depending on the type and concentration of ions present in the solution. Accordingly, the measurement of the electrical conductivity and residual chlorine concentration of the test liquid causes an error in the result of the change in the composition of the test liquid due to the internal liquid flowing out from the liquid junction part 13a of the reference electrode 13.

  As shown in FIGS. 2 and 3, the measurement container 4 is provided with a partition wall 21. The partition wall 21 divides the inside of the measurement container 4 into a plurality of regions into which one or more sensors can be inserted, and isolates the test liquids stored in each region.

  The partition wall 21 is, for example, a conductivity cell and a residual chlorine concentration sensor, which are sensors for items that cause errors in measurement results due to changes in the composition of the test liquid caused by the internal liquid flowing out from the liquid junction 13a of the reference electrode 13. PH sensor 16, first ion sensor 17 and second ion sensor for measuring a potential difference between first region 25 in which is inserted and comparison electrode 13 (which is a sensor including comparison electrode 13) The second area 26 into which 18 is inserted is partitioned.

  The temperature sensor 14 is inserted into the first region 25, for example. Although the pH sensor 16 and the conductivity cell have temperature characteristics, the conductivity cell has a larger influence on the measurement result due to the temperature change. Therefore, by inserting the temperature sensor 14 into the first region 25 and measuring the temperature in the vicinity of the conductivity cell, it is possible to accurately measure the conductivity.

  As shown in FIGS. 2 and 4, the upper end of the partition wall 21 is provided with a first groove 22 for overflowing the test liquid flowing into the first region 25. At the upper end of the outer wall of the measurement container 4, a second groove 23 is provided for overflowing the test liquid flowing into the second region 26. The depths of the grooves 22 and 23 are appropriately designed according to the penetration depth of each sensor into the test solution, etc. so that a sufficient amount of liquid is secured in the measurement of each sensor.

  In the measurement container 4, the maximum height of the liquid level of the test liquid stored in the first region 25 is higher than the maximum height of the liquid level of the test liquid stored in the second region 26. The height of the outer wall of the measurement container 4 and the partition wall 21 is designed. Here, “the maximum height of the liquid surface” means the maximum height from the installation surface that the liquid surface of the test liquid can take when the measurement container is installed on a horizontal installation surface. Specifically, it means the height of the liquid level from the installation surface when the test container is fully scooped with the measurement container 4 and installed on the horizontal installation surface.

  In the present embodiment, the depth d1 of the first groove 22 is designed to be shallower than the depth d2 of the second groove 23. Therefore, the height of the liquid level of the test liquid stored in the first region 25 is higher than the height of the liquid level of the test liquid stored in the second region 26. Accordingly, the test liquid overflowing from the second region 26 when the sensor is inserted is prevented from flowing into the first region 25. In the second region 26, the test liquid containing the internal liquid that has flowed out from the comparison electrode 13 is stored. However, since this test liquid is less likely to flow into the first region 25, in the first region 25, Conductivity can be measured accurately.

<Water quality inspection method>
The water quality inspection apparatus 1 described above is used as follows, for example.

  First, the test liquid is scooped up by holding the handle 20 of the measurement container 4, and the test liquid is filled in the regions 25 and 26 of the measurement container 4.

  Next, the measurement container 4 is installed in the apparatus main body 2. Then, the sensor unit 3 is rotated through the hinge portion to cover the upper portion of the measurement container 4, and each sensor of the sensor unit 3 is immersed in the test solution in the corresponding regions 25 and 26 in the measurement container 4. Let

  Next, the pH, ion concentration, conductivity, residual chlorine concentration, and temperature of the test solution are measured by the sensors 16, 17, 18, 15, and 14, respectively. The measurement of each item may be performed simultaneously, or each item may be sequentially performed one by one with a time interval. Further, after measuring a plurality of items at the same time, the other items may be sequentially performed one by one with a time interval.

  In the case of the present embodiment, for example, in the second region 26, the pH and ion concentration are measured simultaneously, but in the first region 25, the conductivity is measured first, and then the residual chlorine concentration is measured. . By doing so, it is possible to suppress the oxidation-reduction reaction that occurs in the measurement of residual chlorine concentration from affecting the measurement of conductivity.

  The measurement results of the sensors 16, 17, 18, 15, 14 are stored in a storage device (not shown) built in the apparatus main body 2. The measurement result can be confirmed by displaying it on a display device (not shown) connected to the apparatus main body 2.

  According to the water quality inspection apparatus 1 of the present embodiment described above, the following effects can be obtained.

(1) The inside of the measurement container 4 is partitioned into a plurality of regions 25 and 26 by the partition wall 21. Therefore, it can suppress that the sensors inserted in each area | region 25 and 26 form a liquid circuit via a to-be-tested liquid, and mutually interfere.

(2) The reference electrode 13 having the liquid junction 13a is partitioned into a region different from the conductivity cell and the residual chlorine concentration sensor. Therefore, it is possible to accurately measure the conductivity and the residual chlorine concentration with a large measurement error due to the internal liquid.

(3) The measurement container so that the maximum height of the liquid level of the test liquid stored in the first region 25 is higher than the maximum height of the liquid level of the test liquid stored in the second region 26. The height of the outer wall 4 and the partition wall 21 is designed. For this reason, the test liquid overflowing from the second region 26 when the sensor is inserted is prevented from flowing into the first region 25. In the test solution stored in the second region 26, the internal solution flows out from the comparison electrode 13, but the test solution does not easily flow into the first region 25. The rate can be measured accurately.

(4) Grooves 22 and 23 are provided in the upper end portion of the partition wall 21 and the upper end portion of the outer wall of the measurement container 4 for overflowing the test solution. Therefore, it is easy to control the height of the liquid level during measurement to a desired height.

(5) The temperature sensor 14 is inserted into the same first region 25 as the conductivity cell and the residual chlorine concentration sensor. Therefore, highly accurate measurement is possible for these measurement items having large temperature characteristics.

<Modification 1>
In the above embodiment, the inside of the measurement container 4 is divided into two regions by the partition wall 21. However, the number of regions partitioned by the partition walls 21 is not limited to this. For example, in the above embodiment, the conductivity cell and the residual chlorine concentration sensor are partitioned into the same region, but they may be partitioned into separate regions. In measuring the residual chlorine concentration, the conductivity of the test solution changes slightly due to the oxidation-reduction reaction. Therefore, in the above embodiment, the measurement of the conductivity and the measurement of the residual chlorine concentration were performed in order, but the conductivity measurement and the residual chlorine concentration were separated by dividing the conductivity cell and the residual chlorine concentration sensor into separate areas. Concentration measurement can be performed at the same time without reducing accuracy.

<Modification 2>
In the above embodiment, the pH sensor 16 and the ion sensors 17 and 18 are exemplified as those for measuring the potential difference between each of the reference electrodes 13. However, depending on the ions to be measured, it may not be possible to measure the potential difference with respect to the reference electrode 13, and another reference electrode may have to be used. In this case, an error may occur when the measurement is performed in the same region due to a difference in reference potential or impedance. In such a case, the ion sensor having different reference electrodes may be partitioned into different regions.

<Modification 3>
In the above embodiment, the pH sensor 16, the ion sensors 17 and 18, the conductivity cell, and the residual chlorine concentration sensor are exemplified as the plurality of sensors mounted on the sensor unit 3. However, the sensor that can be mounted on the sensor unit 3 is not limited to this. For example, an ORP sensor that measures the redox potential (ORP) of the test solution may be added to the sensor unit 3. In this case, the ORP sensor is preferably inserted in the same second region 26 as the pH sensor 16 and the ion sensors 17 and 18. Further, a DO sensor for measuring the amount of dissolved oxygen (DO) may be added to the sensor unit 3. In this case, the DO sensor is preferably inserted in the same first region 25 as the conductivity cell and the residual chlorine concentration sensor. In the first region 25, a conductivity cell, a redox current measuring sensor, and the like can be arranged. As the redox current sensor, a sensor such as a polarographic type or a galvanic type can be adopted. As specific examples of the oxidation-reduction current measurement sensor, the above-described residual chlorine concentration sensor, DO sensor, or the like can be employed.

<Modification 4>
In the above embodiment, grooves 22 and 23 are provided in the outer wall of the partition wall 21 and the measurement container 4 for overflowing the excess test liquid, and the liquid level of the test liquid stored in the first region 25 is It was made to arrange | position in the position higher than the liquid level of the test liquid accommodated in the 2nd area | region 26. FIG. This is to prevent the test liquid containing the internal liquid from flowing into the first region 25 in which the conductivity cell or the like is installed. The same can be applied to the case of partitioning into the above regions. For example, the depth of the groove provided in the partition wall 21 or the outer wall of the measurement container 4 so that the region where the sensor that is easily influenced by the internal liquid is disposed is disposed at a position where the liquid level of the test liquid is high. Can be adjusted.

<Modification 5>
In the above embodiment, the height of the liquid level of the test liquid stored in each of the regions 25 and 26 is controlled by the grooves 22 and 23 provided on the outer wall of the measurement container 4 and the partition wall 21. However, the method for controlling the height of the liquid level is not limited to this. For example, the outer wall and the upper end of the partition wall 21 are placed on the installation surface so that the height of the outer wall of the measurement container 4 decreases from the front end side (in the above embodiment, for example, the side where the handle 20 is provided) to the rear end side. The same effect can be obtained by forming it so as to be inclined with respect to 2a.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments and modifications, and various modifications can be made without departing from the gist of the present invention.

  The water quality inspection device of the present invention is a water quality inspection device for inspecting water quality of water treatment facilities having a circulating water system such as a boiler and a cooling tower, environmental water such as rivers, lakes, dams, factory treated water, and waste water. Widely applicable to.

DESCRIPTION OF SYMBOLS 1 ... Water quality inspection apparatus, 2 ... Apparatus main body, 3 ... Sensor unit, 4 ... Measuring container, 13 ... Comparison electrode, 13a ... Liquid junction part, 14 ... Temperature sensor, 15 ... Composite sensor, 16 ... pH sensor, 17 ... No. DESCRIPTION OF SYMBOLS 1 ion sensor, 18 ... 2nd ion sensor, 21 ... Partition, 22 ... 1st groove | channel, 23 ... 2nd groove | channel, 25 ... 1st area | region, 26 ... 2nd area | region

Claims (7)

A water quality inspection apparatus for performing a water quality inspection of a test liquid,
A measurement container surrounded by an outer wall and capable of scooping the test solution inside the outer wall ;
A plurality of sensors for immersing in the scooped test liquid and performing a water quality test on the test liquid;
Wherein the interior of the measuring container, one or more of said sensors, each partitioned into a plurality of regions can be inserted, the sample liquid between the plurality of sensors is accommodated in the respective regions in a state in which the immersed in the test liquid comprising a partition wall for isolating,
The plurality of regions include at least a first region and a second region adjacent to the first region via the partition,
The height of the outer wall of the measurement container and the partition wall is such that the maximum height of the liquid surface of the test solution stored in the first region is the liquid of the test solution stored in the second region. Designed to be higher than the maximum height of the surface,
The plurality of sensors include a sensor having a reference electrode having a liquid junction part for electrically connecting an internal liquid and the test liquid, and a composition of the test liquid according to a component flowing out of the liquid junction part. The sensor of the item that causes an error in the measurement result by changing
A sensor of an item that causes an error in the measurement result due to a change in the composition of the test liquid due to a component flowing out of the liquid junction part is inserted into the first region, and includes a comparison electrode having the liquid junction part. The water quality inspection apparatus is characterized in that the sensor is inserted in the second region . A comparison of the sensor having a conductivity cell for measuring the conductivity of the sensor of the item that causes an error in the measurement result due to a change in the composition of the test liquid due to a component flowing out of the liquid junction, and having the liquid junction The water quality inspection apparatus according to claim 1, wherein the sensor including an electrode includes a pH sensor including a glass electrode. A water quality inspection apparatus for performing a water quality inspection of a test liquid,
A measurement container surrounded by an outer wall and capable of scooping the test solution inside the outer wall;
A plurality of sensors for immersing in the scooped test liquid and performing a water quality test on the test liquid;
The inside of the measurement container is divided into a plurality of regions into which one or more of the sensors can be inserted, and the test solutions stored in the respective regions in a state where the plurality of sensors are immersed in the test solution With a septum separating the
The plurality of regions include at least a first region and a second region adjacent to the first region via the partition,
The height of the outer wall of the measurement container and the partition wall is such that the maximum height of the liquid surface of the test solution stored in the first region is the liquid of the test solution stored in the second region. Designed to be higher than the maximum height of the surface,
The plurality of sensors include a first sensor and a second sensor that interfere with each other by forming a liquid circuit through the test liquid when they are inserted into the same region and measured simultaneously. ,
  One of the first sensor and the second sensor is inserted into the first area, and the other is inserted into the second area. The water quality inspection apparatus according to any one of claims 1 to 3, wherein a handle is provided on an outer wall of the measurement container. The first region is surrounded by the partition wall provided between the outer wall of the measurement container and the second region,
The second region is surrounded by the partition wall provided between the outer wall of the measurement container and the first region,
The outer wall of the measurement container surrounding the first region and the minimum height of the partition wall are higher than the minimum height of the outer wall of the measurement container and the partition wall surrounding the second region. The water quality inspection apparatus according to one item. In the partition provided between the first region and the second region, a first groove is formed at an upper end portion, and the first region is formed in a portion where the first groove is formed. The water quality inspection apparatus according to claim 5, wherein an outer wall of the measurement container and a minimum height portion of the partition wall are present. The outer wall of the measurement container that surrounds the second region has a second groove formed at an upper end portion, and the outer wall of the measurement container that surrounds the second region in a portion where the second groove is formed; The water quality inspection apparatus according to claim 5 or 6, wherein a minimum height portion of the partition wall is present.

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