JPH07113630B2 - Water quality checker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water quality checker used for measuring, for example, the water quality of rivers.

[0002]

2. Description of the Related Art For example, in measuring water quality in a river, it is necessary to measure many items such as pH, dissolved oxygen, electric conductivity, and turbidity. Therefore, a water quality checker having a plurality of types of measurement sensors has been developed so that each of these measurements can be performed at once.

In such a water quality checker, it is necessary to calibrate each measuring sensor before the actual measurement is started. In the conventional water quality checker, the calibration is performed by the following procedure. For example, a phthalate solution having a pH of 4 is put into a beaker as a calibration container as a standard solution for calibration. Other measurement sensors except the dissolved oxygen measurement sensor can be calibrated by using this standard solution as it is.However, since this standard solution is also used for calibration of the dissolved oxygen measurement sensor, it is necessary to saturate the standard solution with air. Done. This air saturation is
This is done by bubbling or blowing air into the standard solution.

Each measurement sensor is immersed in the standard solution after bubbling at once, and each measurement sensor is calibrated in this state. That is, each measurement sensor is calibrated based on the measurement data from the standard solution by each measurement sensor. At this time, in the case of a dissolved oxygen measuring sensor, in order to obtain an accurate measured value, it is necessary to give a flow rate above a certain level to the standard solution in contact with the diaphragm surface of the sensor. For this reason,
In the conventional calibration of the water quality checker, the standard solution was stirred using a stirrer.

[0005]

However, in the above-mentioned conventional water quality checker, since the dissolved oxygen measuring sensor is calibrated, a bubbling work which is not necessary for other measuring sensors is required, and the calibrating work is troublesome. Not only,
Since it is necessary to provide a stirrer for giving a flow rate to the standard solution, there is a problem that the structure of the water quality checker becomes complicated and large.

In view of the above-mentioned conventional drawbacks, the present invention is to provide a water quality checker capable of easily calibrating a plurality of types of measuring sensors including a dissolved oxygen measuring sensor and having a simple structure.

[0007]

In order to achieve the above object, a first aspect of the present invention is to provide a sensor section main body having at one end a plurality of types of measurement sensors including at least a dissolved oxygen measurement sensor, and a calibration sensor for calibration. In a water quality checker equipped with a calibration container that stores the standard solution of, the partition wall that isolates the dissolved oxygen measurement sensor from the outside of the calibration container should be calibrated when other measurement sensors enter the calibration container. It is characterized by being formed in a container.

According to a second aspect of the present invention, in a water quality checker in which a plurality of types of measurement sensors including at least a dissolved oxygen measurement sensor are provided at one end of a sensor unit main body, the dissolved oxygen measurement sensor has a sensing unit that is more sensitive than other measuring sensors. It is also characterized in that it is placed near the sensor body.

[0009]

According to the first aspect of the invention, when the measurement sensor is calibrated by immersing the measurement sensor in the standard solution in the calibration container, the dissolved oxygen measurement sensor is placed outside the calibration container by the partition wall of the calibration container. In the isolated state, the other measuring sensor can be immersed in the standard solution in the calibration container. Therefore, the calibration of the dissolved oxygen measurement sensor is performed by using an atmosphere that does not require bubbling or stirring as a standard gas for calibration, and the other measurement sensors use the standard solution to calibrate all of these measurement sensors at the same time. it can.

According to the above configuration of the second invention, when the measurement sensor is immersed in the standard solution contained in the container to calibrate the measurement sensor, the height of the sensor unit body is adjusted with respect to the liquid level of the standard solution. By doing so, the sensing part of the dissolved oxygen measuring sensor can be set to a height not soaked in the standard solution, and the sensing parts of the other measuring sensors can be set to a height so as to be soaked in the standard solution. Therefore, also in this case, the dissolved oxygen measuring sensor can be calibrated by using atmospheric air as a standard gas for calibration, and the other measuring sensors can be calibrated by using the standard solution, so that all of these measuring sensors can be calibrated at the same time. .

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view showing an embodiment of a water quality checker according to the present invention. The water quality checker of this embodiment is
A sensor unit 1, a checker body 3 electrically connected to the sensor unit 1 via a cable 2, a protective tube 4 detachably attached to the sensor unit 1, and a standard solution for calibration are stored. It is composed of a calibration container 5.

The sensor unit 1 is constructed by vertically arranging a plurality of types of water quality measuring sensors on a lower end surface of a sensor unit body 6 having a circular lower end. That is, here, as the water quality measuring sensor, a glass electrode 7 and a reference electrode 8 for measuring pH, a conductivity cell 9 for measuring conductivity, a DO sensor 10 for measuring dissolved oxygen, and a turbidity cell 11 for measuring turbidity are provided. Each of them is provided, and in particular, the DO sensor 10 is arranged at a position biased to the peripheral portion of the lower end surface. The checker body 3 receives the measurement signals from the above-mentioned measurement sensors from the cable 2
It is a device that takes in data via a sensor, calibrates the measurement sensor itself, and processes the measurement results for each item of water quality. The calculation is automatically performed by the built-in microcomputer in response to command input from the operation buttons 3a. The calculation result is displayed on the display unit 3b.

The protective tube 4 has a generally cylindrical shape and is a member which is attached to the lower end of the sensor unit body 6 to surround each measuring sensor and protect the measuring sensor from impacts.
The attachment / detachment to / from the lower end of the sensor unit body 6 is achieved by a bayonet structure. On the peripheral wall of the protective tube 4, an opening 4a and a guide portion 4b projecting toward the inner peripheral side are formed at a circling position corresponding to the mounting position of the DO sensor 10 under the mounting state of the sensor unit main body 6. Has been done. The calibration container 5 is a container having an outer diameter that can be inserted into the protective tube 4 and has a generally cylindrical shape. A part of the peripheral wall of the calibration container is recessed toward the inner peripheral side, and the DO sensor is calibrated when the measurement sensor is calibrated. A partition wall 5a is formed to isolate only 10 on the outside of the calibration container 5. The partition wall portion 5a also serves as a guided groove that is guided by the guide portion 4b of the protective tube 4 when the measurement sensor of the sensor portion 1 is immersed in the standard solution in the calibration container 5 for calibration.

FIG. 2 is a perspective view showing an operation of immersing the measurement sensor of the sensor unit 1 in the standard solution 12 in the calibration container 5 when calibrating the water quality checker, and FIG. 3 is a perspective view showing the operation of immersing the measurement sensor in the standard solution 12. It is a longitudinal cross-sectional view showing a closed state.
With reference to FIG. 2 and FIG. 3, a work procedure for calibrating the water quality checker will be described below. The protective tube 4 is attached to the lower end of the sensor unit body 6, and, for example, from above the calibration container 5 containing the standard solution 12 made of a phthalate solution of pH 4,
The sensor unit 1 is lowered as shown in FIG. At this time, the guide portion 4b of the protective tube 4 is connected to the partition wall portion 5 of the calibration container 5.
Align with a. As shown in FIG. 3, the DO sensor 10 of the sensor unit 1 lowered by the guide by the guide unit 4a and the partition wall unit 5a is arranged in a recessed portion formed by the partition wall unit 5a of the peripheral wall of the calibration container 5. That is, the DO sensor 10 is located outside the calibration container 5 and exposed to the outside air. On the other hand, the other measurement sensor is immersed in the standard solution 12 in the calibration container 5.

Therefore, under this condition, the DO sensor 10 detects the oxygen concentration of the atmosphere, and the checker main body 3 calibrates the atmosphere as the calibration standard gas based on the detection signal. . In its calibration Nitsu other measuring sensor based on the detection signals of these measuring sensor detects the standard solution 12, the calibration is performed in the same manner as in the conventional water quality checker. As described above, since the DO sensor 10 is calibrated by using the atmospheric air as the calibration standard gas, the conventional water quality checker performs a bubbling process on the standard solution 12 or stirs the standard solution 12 with a stirrer. Can be omitted. Since the opening 4a is formed in the protection tube 4 at the circumferential portion corresponding to the mounting position of the DO sensor 10, the DO sensor 10 can be sufficiently exposed to the atmosphere without being obstructed by the protection tube 4. The protective tube 4 is used for the sensor unit 1.
It also functions as a stand member when placing on the floor.

FIG. 4 is a perspective view showing a calibration container 15 in another embodiment of the water quality checker according to the present invention.
3 is a vertical sectional view of the calibration container 15. FIG. In this embodiment, a cylindrical inner peripheral wall is formed in the center of the bottom of the calibration container 15 to form a partition wall portion 15a for isolating the DO sensor 10 from the outside of the calibration container 15. Correspondingly, the DO sensor 10 is provided at the center of the lower end surface of the sensor unit body 6, and the other measurement sensors are the DO sensor 10
Is provided around it so as to surround the. Also in this case,
Since only the DO sensor 10 is exposed to the atmosphere while the other measurement sensors are immersed in the standard solution 12, the same calibration as in the previous embodiment can be performed.

In each of the embodiments described above, the case where the partition walls 5a and 15a for isolating the DO sensor 10 from the outside of the container are formed in the calibration containers 5 and 15 has been described. For example, in the water quality checker of FIG. The height position of the sensing unit of the DO sensor 10 on the lower end surface of the sensor unit body 6 is set sufficiently higher than the height position of the sensing units of the other measurement sensors, that is, a position closer to the lower end surface of the sensor unit body 6. Therefore, under the condition that the sensing parts of the other measurement sensors are immersed in the standard solution 12 in the calibration container 5 at the time of calibration, only the sensing part of the DO sensor 10 is a solution of the standard solution 12 in the calibration container 5. You may make it stop higher than the position.

[0018]

According to the first and second aspects of the present invention, the calibration container is formed with a partition wall portion having the above-described structure and separating only the dissolved oxygen measuring sensor from the other measuring sensors to the outside of the calibration container. In addition, the sensing part of the dissolved oxygen measurement sensor
Is set so that it is closer to the sensor body than the position of the sensing part of the other measuring sensor, so that the dissolved oxygen can be dissolved under the condition that the other measuring sensor is immersed in the standard solution in the calibration container. Only the measurement sensor can be exposed to the atmosphere, and for the calibration of the dissolved oxygen measurement sensor, by using the atmosphere as the standard gas for calibration, all measurement sensors can be calibrated without bubbling the standard solution or stirring with a stirrer. Can be easily performed with a simple configuration.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a water quality checker according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a calibration procedure of a measurement sensor in the water quality checker of the above embodiment.

FIG. 3 is a vertical cross-sectional view showing a positional relationship between a sensor unit and a calibration container at the time of calibration of a measurement sensor in the water quality checker of the above embodiment.

FIG. 4 is a perspective view showing a calibration container in a water quality checker according to another embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a calibration container in a water quality checker of another embodiment.

[Explanation of symbols]

5 Calibration container 5a Partition wall 6 Sensor main body 7 , 8, 9, 11 Other measurement sensor 10 Dissolved oxygen measurement sensor

Claims (2)

[Claims] 1. A water quality checker comprising: a sensor unit main body having a plurality of types of measuring sensors including at least a dissolved oxygen measuring sensor provided at one end thereof; and a calibration container containing a standard solution for measuring sensor calibration. A water quality checker, characterized in that a partition wall is formed in the calibration container to isolate the dissolved oxygen measurement sensor from the outside of the calibration container when the measurement sensor has entered the calibration container. 2. In a water quality checker in which a plurality of types of measurement sensors including at least a dissolved oxygen measurement sensor are provided at one end of a sensor unit main body, the sensing unit of the dissolved oxygen measurement sensor is more sensitive than the sensing units of other measurement sensors. A water quality checker characterized by being placed close to the main body.