JPS58146837A - Water quality measuring device - Google Patents

Abstract

PURPOSE:To enhance measurement accuracy, by providing the inside of a cell with a slidable body consisting of an element and vessels contg. correction solns. fixed to the element, removing matters attached to the inside of the cell, and always executing corrections. CONSTITUTION:A slidable body 24 slidably inserted into the inside of a cell consists of an element 24a made of a magnetic material, such as a magnet, and vessels 24b, 24c contain a zero point correcting soln. 24d and a span correcting soln. 24e, respectively. When the body 24 is located in the right side of the cell 22, a sample (A) passing through a path 20 comes into the cell 22, and UV rays pass through the sample (A). When a power supply controller 25 is controlled to change over currents flowing to coils 23, 23', the body 24 shifts to the left side of the cell 22, a sample (B) flowing through a path 21 enters the cell 22, and the UV rays pass through this sample (B). Sliding the body 24 to the right and left sides permits alternate measurements of the samples (A), (B), and removal of matters attached to the inside of the cell 22, and hence, both of zero point and span corrections.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water quality meter that measures water pollution, particularly a water quality meter that uses ultraviolet absorbance method. The objective is to provide a highly accurate water quality measuring instrument that can remove dirt from cells (through which water passes).

In general, absorbance-type water quality measuring instruments measure water pollution by irradiating ultraviolet rays, etc., onto a cell that contains (or passes through) sample water, and detects the light that passes through the cell to obtain absorbance. It is.

The water quality measuring instruments in this building cannot accurately measure water pollution if substances dissolved in the sample (water) are adsorbed or deposited on the inner wall of the cell.

For this reason, water quality measuring instruments that can remove substances adsorbed on the inner walls of cells have been developed. Among these, there are those that wash the cell with a brush, and those that wash the cell by emitting ultrasonic waves or air bubbles at regular intervals.

FIG. 1 shows an example of a conventional water quality meter.

In FIG. 1, 1 is a cell into which a sample 2 is placed, and 3 is a brush that slides inside the cell 1 to remove substances adsorbed to the inner wall of the cell 1. This brush 3 is driven by a piston motor 4. It moves back and forth within the cell 1. 6
is a light source such as a low-pressure mercury lamp, and the light emitted from this light source 6 is transmitted through the cell 1. Reference numerals 6 and 6' denote filters respectively attached to the rotary plate 7, with the filter 6 transmitting ultraviolet light and the filter 6' transmitting visible light. 8 is a motor that rotates the rotary plate 7. The ultraviolet rays and visible light that have passed through the cell 1 and further passed through the filter 6.6' are sequentially converted into electrical signals by the photoelectric element 9. Reference numeral 10 denotes a signal processing unit that processes the signal from the photoelectric element 9. In this signal processing unit 1°, the transmitted amount of ultraviolet rays and visible light and the ratio thereof are determined. 11 is a control section, and this control section 11 controls the light emission intensity of the light source 6 based on the output of the signal processing section 1o, and also controls the piston motor 4. Reference numeral 12 is an indicator that displays absorbance or concentration if the sample is a solution of a certain substance.

However, in the conventional water quality measuring instruments mentioned above, the stability of the light source, the dirt on the optical system in the optical path, the stability of the light receiving element, etc. all affect the accuracy of absorbance measurement, so the light source power source, etc. must be stabilized. However, for drift in other parts, there is a drawback that comparisons with a reference liquid or zero calibration liquid must be periodically performed manually.

The present invention eliminates the above-mentioned drawbacks of the conventional art, and one embodiment of the present invention will now be described with reference to FIG. 2.

In FIG. 2, 20 is a channel through which the sample B flows, 21 is a channel through which the sample B flows, and the channels 20 and 21 are connected by a cell 22 made of quartz or the like.

23. 23' is a coil placed on the left and right outer periphery of the cell 22, and 24 is a sliding body slidably inserted in the cell 22, and this sliding body 24 is shown in FIG. As shown, an element part 24& made of a magnetic material such as a magnet or soft iron, and a container part 24b fixed to both ends of this element part 24&,
240.

The container parts 24b and 240 contain zero calibration liquid 24d, respectively.
A span calibration liquid 246 is contained.

Further, the surface of the element portion 24& is coated with Teflon or the like to prevent it from being attacked by substances in the sample.

26 is a power supply control section, and this power supply control section 26 controls the ultraviolet light source 26 and the coils 23 and 23'. The ultraviolet rays emitted from the ultraviolet light source 26 are collected by a condensing optical system 27
After passing through the cell 22, the light is collected by a light collecting optical system 28, received by an ultraviolet light receiving sensor 29, and converted into an electrical signal. 3o is an amplification calculating section that amplifies and calculates the output of the ultraviolet light receiving sensor 29, and 31 is an indicating section that displays the degree of light absorption or the converted concentration value.

As shown in FIG. 2, when the slider 24 is located on the right side of the cell 22, the sample flowing in the channel 20 or the cell 2
2 and the ultraviolet rays will pass through this sample A. When the power supply control section 26 is controlled to switch the current to the coils 23' and 23 from the state shown in FIG. 2, the sliding body 24 moves to the left side in the cell 22, as shown by the broken line in FIG. However, the sample B flowing in the channel 21 enters the cell 22, and the ultraviolet rays pass through this sample B. In the process of the sliding body 24 moving from the right side to the left side in the cell 22, the following outputs are sequentially obtained from the ultraviolet light receiving sensor 29.

(1) Output due to the transmitted light of the sample person (2) Output due to the transmitted light of the zero calibration liquid 24d (3)
Dark current due to light shielding of element section 24 & (4) Output due to transmitted light of span calibration liquid 24θ (6) Output due to transmitted light of sample B Conversely, in the process of moving the sliding body 24 from the left side to the right side in the cell 22, 6 -> 4 -> 3 -> 2 -> 1 - 1 odor becomes poor.

In this way, according to this embodiment, by sliding the sliding body 24 left and right, it is possible to alternately measure the samples M and B, and by the sliding movement of the sliding body 24,
It is possible to remove substances adhering to the inner wall of the cell 22, and also to perform zero calibration and span calibration.

In addition, in the second embodiment, the sliding body 24K.

A container part 24b containing the zero calibration liquid 24d and a container part 240 containing the span calibration liquid 24el may be provided, or either one of them may be provided.

The mounting point of 24c is the element part 24! Not limited to the end of L,
A through hole is formed in the element part 24&, and the container part 24b.

240 may be fixed within this through hole.

Further, in the above embodiments, the condensing optical systems 27 and 28 are constituted by lenses, or may be not limited to lenses but may be optical guides, or may be omitted in some cases.

That is, when the cell 22 is cylindrical, the cylindrical shape is used and the light source 26 and ultraviolet light receiving sensor 29 are placed at the focal point of the cylindrical cell 22, thereby omitting the light collecting optical systems 2 and 28. It is something that can be done.

In addition, in the above embodiment, in order to always measure a new sample, when the slider 24 slides from side to side, the slider 24
It is preferable that both end surfaces of the flow path 20 and 21 stop at the interface between the flow paths 20 and 21 and the cell 22, respectively, and it is not preferable for the sliding body 24 to protrude into the flow paths 20 and 21 from the viewpoint of operation. It is preferable to provide a stopper for the sliding body 24 at the boundary between the channels 20, 21 and the cell 22.

In addition, in the above embodiment, measurement is performed using only ultraviolet rays, but the ultraviolet rays and visible light in the light component of the light source are separated by a filter, the ultraviolet rays and visible light are received alternately, and the measurement is performed using ultraviolet rays and visible light. It is acceptable to do so.

The present invention has the above-mentioned configuration, and the following effects can be obtained according to the present invention.

(1) Since the sliding body slides within the cell, substances adhering to the inner walls of the cell can be removed, and measurement accuracy can be improved.

(2) In the process of measuring a sample, zero calibration and/or span calibration can be performed at all times, improving measurement accuracy.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional water quality meter, FIG. 2 is a schematic diagram of a water quality meter according to an embodiment of the present invention, and FIG. 3 is a sectional view of a sliding body of the same water quality meter. 20.21...Flow path, 22...Cell, 2
3.23'... Coil, 24... Sliding body, 241L... Element section, 24b, 24C... Container section, 24d... Zero calibration liquid, 24el...
...Span calibration liquid, 26...Power control section, 26
......Ultraviolet light source, 27.28...Condensing optical system, 29...Ultraviolet light receiving sensor, 30.
...Amplification calculation section, 31...Instruction section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (2)

[Claims] (1) A cell into which a sample is introduced, an element part slidably housed in this cell, at least one container part fixed to this element part, and a calibration liquid placed in this container part. A water quality measuring instrument comprising: a sliding body; a magnetic driving means for magnetically driving the sliding body; and a measuring means for measuring the absorbance of the sample introduced into the cell or the calibration solution. (2) A sliding body is constructed by fixing a first container containing zero calibration liquid and a second container containing span calibration liquid to both ends of an element made of a magnetic material such as a magnet or soft iron. A water quality measuring instrument according to claim 1, comprising: