JPH07253391A - Measuring cell for turbidity sensor - Google Patents

Abstract

PURPOSE:To detect a precise turbidity by a method wherein a light projector and a light receiver are installed as a pair along the longitudinal axis and the transverse axis of a watertight container whose length and breadth sizes are different and a water injection port and a water discharge port for test water are formed at both ends of the watertight container. CONSTITUTION:A light projector 2A and a light receiver 2B are installed along the longitidinal axis 1A and the transverse axis 1B of a watertight container 1 whose length and breadth sizes are different, and a water injection port 3 and a water discharge port 4 for test water are formed at both ends of the container 1. A material which is hard to corrode and which is provided with a chemical-resistant property is used as the material of the container 1, and parts in which the light projector 2A and the light receiver 2B are faced are made transparent. When a turbidity is measured, the test water is made to flow into from the water injection port 3, and the water is discharged from the water discharge port 4. Then, the turbidity is detected on the basis of values obtained by the light projector 2A and the light receiver 2B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a measuring cell for a turbidity sensor.

[0002]

2. Description of the Related Art Conventionally, as a device for inspecting the quality of material water such as tap water, a pair of light-emitters is provided along the vertical or horizontal axis of a watertight container, and the amount of light received by the light receiver and the amount of light emitted by the light emitter are A turbidity sensor is known in which the transparency of the sample water is measured by comparing.

By the way, this turbidity sensor has an accurate turbidity because the scale of the cell itself, that is, the transparency of the transparent window on the front surface of the light emitter / receiver, decreases with time due to the adhesion of water stains or the like in the cell during long-term use. There was a problem that it could not be detected. Most of these problems can be solved by cleaning the inside of the cell on a regular basis, but the maintenance management is very troublesome, and the detected value before and after cleaning may differ significantly depending on the turbidity. However, there was a problem that correction of the detection value for that was very troublesome.

In order to solve such a problem, two measurement cells for turbidity sensors having two long and short optical axis lengths are prepared, and the detected values obtained from these measurement cells are used regardless of contamination inside the cells. A measurement cell for a turbidity sensor capable of detecting the turbidity of water has been considered.

That is, in FIG. 3, in the two cells A and B, the length of the optical axis of the cell A having a short optical axis is L ₁ , and the length of the optical axis of the cell B having a long optical axis is L ₂ . The difference is L ₂ −L ₁ = L _3, and the light absorption amount of the sample water of the cell A having a short optical axis is a ₁ , the light absorption amount of the cell B having a long optical axis is a ₂ , and a ₂ −a ₁ = a ₃ ,
Then, the difference between the measured values obtained in both cells is the optical path length: L ₂ −L ₁ = L ₃ (constant). Since the inner surface of the cells A and B can be regarded as having substantially the same condition, the amount of light absorption due to the contamination attached to the inner surfaces of the cells A and B is b.
Then, the amount of light absorption: (a ₂ + b)-(a ₁ + b) = (a ₂ + a ₃ + b)-(a ₁ + b) = a ₃ and the light with constant optical path length L ₃ It is possible to accurately measure the absorption amount a ₃ regardless of the light absorption amount b due to the dirt in the cells A and B.

[0006]

However, in the measuring cell for the turbidity sensor, it is necessary to provide two cells, long and short, and it is necessary to supply the sample water under the same conditions as possible. However, the installation area is large, and it is necessary to give due consideration to the installation of equipment such as piping.

[0007]

In view of the above problems, the present invention provides a measuring cell for a turbidity sensor, which has a small installation volume, requires almost no consideration for piping, etc., and can accurately detect turbidity. It was made for the purpose of doing.

[0008]

[Means for Solving the Problems] That is, the measuring cell for a turbidity sensor of the present invention comprises a projector (2A) along a vertical axis (1A) and a horizontal axis (1B) of a watertight container (1) having different vertical and horizontal dimensions. ) And the light receiver (2B) are provided as a pair, and the watertight container
It is characterized in that test water injection / drainage ports (3) and (4) are provided at both ends of (1).

[0009]

The present invention prepares a watertight container (1) having different vertical and horizontal dimensions as a measurement cell for a turbidity sensor, and projects the light projector (1A) along the vertical axis (1A) and the horizontal axis (1B) of the watertight container (1). 2A) and the light receiver (2B) are provided, it is possible to detect the turbidity in two directions in one container at the same time. Therefore, accurate measurement becomes possible. In addition, since only one type of plumbing work is required for one watertight container for the water pipe for the data, installation etc. is easy.

[0010]

Embodiments of the present invention will be described below. 1 is a side sectional view of an embodiment of the present invention, and FIG. 2 is a vertical sectional view of the embodiment.

The measuring cell for a turbidity sensor of the present invention comprises a light emitter (2A) and a light receiver (2B) along a vertical axis (1A) and a horizontal axis (1B) of a watertight container (1) having different vertical and horizontal dimensions. Are provided in pairs, and the water-tight container (1) is provided with the water supply / drainage ports (3) (4) at both ends thereof.

In the above embodiment, the watertight container (1) may be made of any material that does not easily corrode and has chemical resistance, such as plastic. Further, the watertight container (1) is not particularly required to be made of a transparent material as a whole, and as shown in the figure, only the portions facing the light emitters / receivers (2A) and (2B) may be transparent members.

The vertical and horizontal dimensions of the watertight container (1) are made different only because the optical axis lengths of the light emitters / receivers (2A) and (2B) provided in the pair are made different. The shape of () is not limited to a rectangular shape, but may be a cross shape as shown in the figure.

The optical axes of the two pairs of light emitters / receivers (2A) (2B) are
As shown in FIG. 2, they may be provided in a relationship that they do not cross each other. When detecting turbidity, the sample water is introduced from the inlet (3) and discharged from the outlet (4), while the values obtained from the two sets of emitter (2A) and receiver (2B) are used. The turbidity is detected.

[0015]

As described above, according to the present invention, since the turbidity of the sample water injected into one watertight container is measured by the two sets of the projector (2A) and the receiver (2B), the accurate Since the turbidity can be measured and only one watertight container is required, the volume occupied by the watertight container can be made smaller than before, and the reference water piping is also only for one set of inlet / outlet (3) (4). Since it suffices to carry out construction, there are various effects such as construction being simple.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an example.

FIG. 3 is a side view of a conventional example.

[Explanation of symbols]

 (1)… Watertight container (1A)… Vertical axis (1B)… Horizontal axis (2A)… Emitter (2B)… Receiver (3)… Water injection port (4)… Drainage port

Claims (1)

[Claims] 1. A vertical axis (1) of a watertight container (1) having different vertical and horizontal dimensions.
A) and the horizontal axis (1B) along the sender (2A) and receiver (2A), respectively.
B) and the watertight container (1) are provided as a pair, and a test water injection / drainage port (3) (4) is provided at both ends of the watertight container (1). .