JPS58146838A - Water quality measuring device - Google Patents

Abstract

PURPOSE:To enhance accuracy, by sliding a slidable magnetic element to the right and left sides in the inside of a cell, alternately measuring transmittance of samples, and removing matters attached to the inside wall. CONSTITUTION:When a magnetic element 24 is located in the right side of a cell 22, a sample (A) flowing through a path 20 enters the cell 22, and UV rays pass through this sample (A). When a power supply controller 25 is controlled to change over currents flowing to coils 23, 23', the element 24 shifts to the left side of the cell 22, a sample (B) flowing through a path B enters the cell 22, and the UV rays pass through this sample (B). Thus sliding the element 24 to both sides permits alternate measurements of the samples (A) and (B), and removal of matters attached to the inside wall of the cell 22. When the sample (A) is the liquid to be examined, and the sample (B) is a reference standard soln., the measurement for the sample (A) can be always executed in comparison with the standard soln. B.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water quality meter that measures water pollution, a water quality meter that uses ultraviolet absorbance method for reading, and is capable of comparatively measuring the water pollution of two types of samples. The purpose of the present invention is to provide a high-precision water quality measuring instrument that can remove dirt from a cell (or pass through).

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 the absorbance. be.

This type of water quality meter cannot accurately measure water pollution if substances dissolved in the sample (water) are adsorbed and deposited on the inner wall of the cell.

1 For this reason, water quality measuring instruments have been developed that can remove substances that have been adsorbed on the inner walls of cells. Among these, there are those that clean the cell with a brush, and those that clean the cell by emitting ultrasonic waves or 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' designate filters respectively attached to the rotary plate 7, with the filter 6 transmitting ultraviolet light and the filter d 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 filters e and e are sequentially converted into electrical signals by the photoelectric element 9. 1o
is a signal processing section that processes the signal from the photoelectric element 9,
In this signal processing section 1°, the amount of transmitted ultraviolet light and visible light and their ratio 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 10, and also controls the piston motor 4. 12 is an indicator that displays absorbance or concentration if the sample is a solution of a certain substance.

However, the conventional water quality measuring instruments described above have the disadvantage that they can only measure a single sample. In addition, in water quality measuring instruments that can only measure a single sample, 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 absorbance measurement accuracy. However, there is a drawback that drift in other parts must be manually compared periodically with a reference liquid or zero calibration liquid.

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

In FIG. 2, reference numeral 20 denotes a flow path through which the sample B flows, 21 represents a flow path through which the sample B flows (11), and the flow paths 2o and 21 are connected by a cell 22 made of quartz or the like. 23 and 23' are coils arranged on the left and right outer peripheries of the cell 22, and 24 is a magnetic element slidably inserted into the cell 22. The magnetic element 24 is made of a magnet or a magnetic material such as soft iron. It is formed. Further, the surface of the magnetic element 240 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 2i. 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 calculation unit that amplifies and calculates the output of the ultraviolet light receiving sensor 29, and 31 is an indicator unit that displays the degree of light absorption or the converted concentration value.

As shown in FIG. 2, when the magnetic element 24 is located on the right side of the cell 22, the sample flowing in the flow path 2o enters the cell 22, and the ultraviolet rays pass through this sample. Become. From the state shown in FIG. 2, the power supply control unit 26 is controlled,
When the current to the coils 2s and 23 is switched, the magnetic element 2
4 moves to the left side in the cell 22 as shown by the broken line in FIG. 2, and the sample B flowing in the channel 21 enters the cell 22.
The ultraviolet rays will pass through this sample B.

As described above, according to this embodiment, by sliding the magnetic element 24 left and right, it is possible to measure the samples M and B alternately, and the sliding movement of the magnetic element 24 also allows the measurement of the sample B to be carried out alternately. It is possible to remove substances adhering to the inner wall of 22.

In FIG. 2, if sample M is the liquid to be measured and sample B is the comparison standard liquid, the measurement of the liquid to be measured can always be performed by comparing it with the comparison standard liquid B. ,
Signal currents corresponding to the concentrations of samples M and B appear alternately, and measurements can be made with high accuracy while comparing the absorbance (concentration in some cases) using one as a reference.

In the above embodiment, the condensing optical systems 27 and 28 are composed of lenses, but they are not limited to lenses and may be optical guides, or may be omitted depending on the case. That is, when the cell 22 is cylindrical, by utilizing this cylindrical shape and arranging the light source 26 and the ultraviolet light receiving sensor 29 at the focal point of the cylindrical cell 22, the light collecting optical system 2
7°28 can be omitted.

In addition, in the above embodiment, in order to always measure a new sample, when the magnetic element 24 slides left and right, both end surfaces of the magnetic element 240 are stopped at the interface between the flow channel 20° 21 and the cell 22. It is preferable that the magnetic element 24
It is undesirable for the flow to protrude into the flow path 20.21 from an operational point of view. For this reason, it is preferable to provide a stopper for the magnetic element 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 configuration, and according to the present invention, the following effects can be obtained.

(1) Since the magnetic element is slid within the cell, substances adhering to the inner wall of the cell can be removed, and measurement accuracy can be improved.

(2) Two samples can be compared and measured. In particular, if one of the samples is used as a reference solution or a zero calibration solution, calibration due to drift or the like can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional water quality meter, and FIG. 2 is a schematic diagram of a water quality meter according to an embodiment of the present invention. 20.21...flow path, 22...cell,
23゜23'... Coil, 24... Magnetic element, 26... Power control unit, 26...
・Ultraviolet light source, 27, 28... optical system for condensing light,
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 2: Quality Release

Claims (1)

[Claims] (1) A tenth flow path through which the first sample flows, a second flow path through which the second sample flows, and a cell that connects the first flow path and the second flow path; a magnetic element slidably housed in the cell; a magnetic driving means for magnetically driving the magnetic element; A water quality measuring instrument comprising a measuring means for measuring the absorbance of a second sample. C; 2) The first . The second carp A and this first carp. 2. The water quality measuring instrument according to claim 1, wherein the control unit for switching the energization to the second coil constitutes a magnetic drive means.