JPS5942685Y2 - UV absorption photometer - Google Patents

Description

[Detailed description of the invention] The present invention relates to an ultraviolet absorption photometer, which prevents the generation of ozone due to the ultraviolet light source during measurement, and which allows accurate measurement over a long period of time by keeping the measurement cell clean at all times. .

In a conventional ultraviolet absorption photometer, a glass cell filled with a liquid to be measured is placed between an ultraviolet light source and a detector. The optical recorder is filled with ozone generated by ultraviolet rays, resulting in reading errors, and the components of the measuring device are corroded by the ozone, shortening their lifespan.

Furthermore, when a liquid to be measured such as seawater, river water, industrial wastewater, etc. is continuously flowed into the glass cell, the wall surface of the cell is contaminated by the liquid to be measured, resulting in an error in indication.

In view of the above, the present invention aims to eliminate the drawbacks of conventional ultraviolet absorption photometers.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the ultraviolet absorption photometer of the present invention, which is shown immersed in a liquid to be measured, such as seawater.

In this figure, 1 is a cylindrical measuring cell made of transparent glass and open at both ends, and a closed case 2
The cell 1 is fixed to the case 2 so as to pass vertically through the cell 1, and the liquid to be measured can freely enter and exit the cell 1.

A wiper 3 is made of rubber or flexible resin and has a circular horizontal cross section. The wiper 3 is fixed to the lower end of the connecting rod 4 via a ring 5, and is arranged so that it can slide in close contact with the inner surface of the cell 1. .

As shown in FIG. 2, the connecting rod 4 is provided with a communication passage 6 for communicating the upper and lower parts of the wiper 3 which are closely arranged in the cell 1.

On the other hand, in case 2, tdN2. It is filled with an inert substance such as an inert gas such as He, Ne, Ar, etc., and an ultraviolet light source 7 is installed on one side of the cell 1, and a detector 8 is installed on the other side. A chopper 9 is provided in front of the octopus detector 8.

Reference numeral 10 denotes an electric cylinder as a wiper driving means, which is connected to the upper end of the connecting rod 4, and is intermittently energized by a timer or the like to reciprocate the wiper 3 up and down via the connecting rod 4, thereby moving the inner surface of the cell 1. Have them clean the area.

11 is a seal ring for keeping the inside of the case 2 sealed with respect to the cell 1, and 12 is a flange for attaching the cell.

In the embodiments shown in FIGS. 1 and 2, both ends of the wiper are open, but in FIG. 3, one end is open and the other end is closed. An example of an ultraviolet absorption photometer is shown.

This cell 21 is made to protrude from a closed case 22 filled with an inert substance with its open end facing toward the earth, and with its lower closed end sealed inside the case 22. It is fixed to the cell 21 of the box octopus.
A horizontally oriented measured liquid outlet 21a is provided at the upper end.

As is clear from FIG. 4, 23 is a rubber wiper with a circular horizontal cross section, which is fixed to the lower end of the connecting rod 24 and is moved up and down in close contact with the inner surface of the cell 21 by the operation of the electric cylinder 20 to clean it. It is supposed to be done.

And this wiper 23 has ml on both sides of the connecting rod penetration part.
A J constant solution communication hole 25.25 is provided, and a connecting rod 24
A communication path 26 is provided below the wiper 23 fitted in the cell 21 for supplying an external liquid to be measured.

Therefore, the initial filJ constant solution is
6 and enters below the wiper 23 of the cell 21, and then exits through the communication holes 25, 25 of the wiper 23 and enters the outlet 21a.
flows to.

In FIG. 3, 27 indicates a seal ring and 28//i a cell mounting flange.

In addition, as the connecting rod driving means, a solenoid, an air cylinder, etc. can be used in addition to the electric cylinder.

As explained above, the ultraviolet absorption spectrophotometer of the present invention has an inert substance sealed in the closed case, so that it is possible to prevent the generation of ozone due to ultraviolet rays.

Further, since a wiper is provided inside the cell and can be slid in close contact with the inner surface of the cell, the inner surface of the cell can be cleaned easily and effectively.

Since the connecting rod of the wiper is provided with a communication path leading upward and downward, the sample can be easily replaced and ultraviolet absorbance can be measured continuously and stably over a long period of time.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing one embodiment of the ultraviolet absorption photometer of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a longitudinal sectional view showing another embodiment. 4 is a sectional view taken along the line IV-IV in FIG. 3. 1.21...Measuring cell, 2,22...Downward closed case, 3,23...Wiper 4,24...
...Round connection rod, 6,26...Communication path, 7...
-...Ultraviolet light source, 8...-t* output device, 9...
Chopper, 10, 20... Drive means, 25.
...Communication hole.

Claims (5)

[Scope of utility model registration request] (1) A measurement cell with at least one end open is inserted into a sealed case so that the inside of the cell communicates with the outside of the case but not with the inside of the case, and the inside of the case has a measuring cell that is separated from the outside of the case. An ultraviolet light source and a detector are installed on both sides of the cell, and an inert substance is sealed inside the cell, and the cell is slidable in close contact with at least the side facing the light source and detector on the inner surface of the cell. An ultraviolet absorption photometer comprising: a wiper; the wiper is connected to a driving means via a connecting rod; and the connecting rod is provided with a communication path communicating above and below the wiper. (2) The ρ ultraviolet absorption spectrophotometer according to claim 1, wherein the measurement cell is open at both ends. (3) The ultraviolet absorption spectrophotometer according to claim 2, wherein the wiper disposed within the measurement cell is formed in a shape corresponding to the cross-sectional shape of the cell. (4) The ultraviolet absorption photometer according to claim 1, wherein the measurement cell has one end open and the other end closed. (5) The ultraviolet absorption photometer according to claim 4, wherein the wiper is formed in a shape corresponding to the cross-sectional shape of the measurement cell, and the wiper is provided with a communication hole.