JPH0438291Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in the detection section of a water quality measuring instrument used to measure water quality in river processes, etc.

[Prior art]

2. Description of the Related Art In general, a composite type equipped with two or more sensors (electrodes) is often used as a detection section of a water quality measuring device (hereinafter referred to as a measuring device). FIG. 1 shows a typical example, in which a sensor block 2 is attached to the tip of a sensor support 1, a sensor 3 is protruded from the outside of the sensor block 2, and a temperature sensor 4 is installed inside the sensor block 2. has been established.

According to the above-mentioned configuration, the detection section can be made relatively compact, but since the sensor support 1 and the sensor block 2 are made of a material such as plastic that is highly resistant to chemicals, the temperature sensor 4 can be made relatively compact. The above arrangement is not preferable in terms of temperature followability.

Therefore, in order to improve the above-mentioned points and make it possible to measure a wider variety of items, a detection section having a configuration as shown in FIG. 2 has been devised. That is, different sensors 6 and 7 are provided on the lower end surface 5a of the sensor support 5.
and a temperature sensor 8 are provided in a plane.

In this way, multiple types of sensors 6, 7, 8
When setting up multiple measurement items, e.g. PH concentration,
Although it has the advantage of being able to measure dissolved oxygen content, conductivity, turbidity, etc. at the same time, when considering the handling of the detection unit and the size of the area in which it is immersed,
It is not preferable to make the cross-sectional area of the lower end surface 5a of the support body 5 too large, and therefore the number of sensors mounted on the lower end surface 5a is naturally limited.

In addition, in this type of measurement, the temperature of the test liquid is usually measured as well, but in order to make more accurate measurements, the temperature sensor 8 is placed close to the other sensors 6 and 7, so This temperature sensor 8 has to be exposed outside the sensor support 5, but since the temperature sensor 8 is covered with glass or the like, there is a risk that it will be damaged by an unexpected impact force and the temperature sensor itself may be damaged. .

[Purpose of invention]

The present invention has been developed in consideration of the above-mentioned matters, and it is possible to mount more sensors in a compact manner without increasing the size of the detection part consisting of the sensor support, etc. It is an object of the present invention to provide a measurement detection section that is not damaged.

[Structure of the idea]

In order to achieve the above purpose, in this invention,
The sensor support provided with one or more sensors is provided with a through hole in a direction intersecting the axial direction of the sensor support, and the sensor is provided within this through hole.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 3 shows the configuration of a measuring section 10 of an electromagnetic induction conductivity meter to which the present invention is applied, and 11 is a sensor support made of a plastic material such as PCV or PP, which is highly resistant to chemicals. A sensor 12 consisting of an annular excitation coil 12a and a detection coil 12b is provided at its tip, and the outside of this sensor 12 is covered with a cap 13, forming a so-called non-wetted structure. 14 and 15 are lead wires connected to the coils 12a and 12b, respectively, which pass through small holes 16 and 17 drilled in the axial direction of the sensor support 11, and through a relay terminal box (not shown). Connected to the measuring instrument body (not shown).

Reference numeral 18 denotes an elongated through hole having a long diameter in the vertical direction, which is provided so as to penetrate the sensor support 11 in a direction intersecting the axial direction thereof, for example, in the radial direction. A vertical hole 19 is further provided above and below in the major axis direction of the through hole 18, and 20 is a vertical hole 19.
9 is a temperature sensor inserted from above. Reference numeral 20a designates a temperature sensing portion of this temperature sensor 20, the surface of which is covered with glass, for example, and is located within the through hole 18. Therefore, the temperature sensitive part 20a comes into direct contact with the test liquid in the through hole 18. 21 is a sealing material such as an O-ring. The temperature sensor 20 is detachably attached, for example, to the upper part of the sensor support 11, and its signal output line 20b is connected to the measuring instrument main body via the aforementioned relay terminal box.

A communication hole 22 connected to the through hole 18 is provided below the through hole 18 in the longitudinal direction, so that the test liquid can also flow into the through hole 18 from the lower end side opening 22a of the communication hole 22. It is configured.

When the detection section 10 configured as described above is immersed in the test liquid, the through hole 18 is also filled with the test liquid, so that the temperature sensitive section 20a of the temperature sensor 20
is sensitive to this. On the other hand, in this immersed state, when an excitation current is supplied to the excitation coil 12a via the lead wire 15, a predetermined magnetic field is generated, and this magnetic field generates a detection current in the detection coil 12b. The conductivity of the test liquid is measured based on this, and a predetermined measurement can be performed.

Conventionally, when a relatively large sensor 12 is provided at the tip of the sensor support 11, the temperature sensor
However, if the through hole 18 is provided as described above, the temperature sensor 20 can be provided within the through hole 18.
The number of sensors that can be mounted on the sensor support 11 can be increased. Moreover, since the temperature sensitive part 20a detects the temperature of the test liquid in the through hole 18 connected to the test liquid outside the detection part 10, the temperature of the test liquid in the vicinity of the sensor 12 is substantially detected. This means that the temperature is being measured. Therefore, followability in temperature measurement is greatly improved. In particular, since a sensor such as a temperature sensor can be provided in the through hole 18, the outside of which is made of a material that is relatively weak against impact force, such as glass, so that the sensor will not be damaged by unexpected external pressure. Note that, of course, two or more types of sensors may be provided in the through hole 18.

FIG. 4 shows another embodiment of the present invention, in which a sensor 23 consisting of a glass electrode 23a for measuring pH and a reference electrode 23b is mounted on the lower end surface 11a of the sensor support 11, and a sensor 23 for measuring the amount of dissolved oxygen. A sensor 24 made of a DO electrode is provided, and a temperature sensor 20 is provided inside the through hole 18. In addition, 2
2 is a communication hole for communicating the lower end surface 11a side and the through hole 18. When the communication hole 22 is provided in this manner, it is possible to sufficiently cope with the flow of the test liquid from the direction of the lower end of the sensor support 11.

[Effect of idea]

Since the detection section of the measuring instrument according to the present invention is configured as described above, multiple types of sensors can be arranged three-dimensionally, without increasing the size of the sensor support, especially its cross-sectional area. , the number of sensors that can be implemented can be increased. Further, a sensor that is weak against impact force can be provided while maintaining contact with the test liquid, and a compact detection section with excellent response characteristics can be realized.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional perspective view showing a conventional example;
FIG. 2 is a perspective view showing a conventional example, FIG. 3 is a sectional perspective view showing an embodiment of the present invention, and FIG. 4 is a perspective view showing another embodiment. 10...detection section, 11...sensor support, 18
...Through hole, 12, 20, 22, 23, 24...
sensor.

Claims (1)

[Scope of utility model registration request] 1. A detection section of a water quality measuring device, characterized in that a sensor support provided with one or more sensors is provided with a through hole in a direction intersecting the axial direction of the sensor support, and a sensor is provided in the through hole.