JPS6385334A - Thermostatic apparatus for analyser - Google Patents

Abstract

PURPOSE:To perform highly accurate measurement and analysis stable over a long period of time without performing the replacement of constant temp. water or the mixing of a surfactant, by providing a means for removing the impurities of the constant temp. medium in a constant temp. medium recirculation route. CONSTITUTION:Constant temp. water 9 is recirculated in the direction shown by an arrow by a pump 3 and held to a constant temp. by the heater 4 provided to a part of the flow passage of said water 9. In a process where the water 9 is recirculated through a recirculation route 10, dust is removed by a filter 5 and, subsequently, various ionized substances are removed by the ion exchange resin in a container 6 and, further, bacteria are reduced by a sterilizing lamp 7. Gas is removed by a degassing device 8 and clean constant temp. water is always recirculated and supplied to a reaction part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a constant temperature device for an automatic chemical analyzer, and particularly to a constant temperature device in which a constant temperature medium is circulated.

(Prior Art) Conventionally, as this type of constant temperature device, there is one that uses water as a constant temperature medium.

As shown in Fig. 2, the conventional water circulation constant temperature device forms a water circulation path 10 for the reaction section l of an automatic chemical analyzer, and a pump 3 is connected to this circulation path lO to keep the temperature of the water constant. A heater 4 is provided which is controlled so that the reaction section l
It is designed to circulate and supply water at a constant temperature. In the reaction section 1, a container 2 made of glass or plastic, called a reaction cell, is supported by an annular reaction table 11 and placed in constant temperature water 9, and the sample in the reaction cell 2 under a constant temperature condition is heated. Various components in a sample are measured by transmitting a beam of light into a reaction cell and measuring its spectral characteristics as a result of chemical reactions of reagents. Figure 3 shows the photometric system that constitutes the measuring section, 12 is a light source, 13.13
is a lens.

14 is a spectral filter, 15 is a detector, 16 is a signal processing/
It is an indicator.

(Problem to be solved by invention) However, if such a constant temperature device is used continuously for a long period of time,
There is a problem in that measurement accuracy deteriorates due to impurities mixed into the constant temperature medium.For example, in conventional devices, atmospheric gases (OS, Co), etc.

etc.) and salts (Ca, Na, etc.) may dissolve in the constant temperature water 9, or dust, bacteria, germs, etc.
Bubbles may be generated in constant temperature water by mixing with
There was a problem in that the outer wall of the reaction cell became dirty, causing a change in the transmittance or spectral absorption characteristics of constant-temperature water, resulting in a deterioration in measurement accuracy.

In order to solve this problem, conventionally the constant temperature water 9 was replaced periodically (usually daily), but in this case, it took time for the temperature of the constant temperature water 9 to become constant, making the measurement difficult. There was a problem that the efficiency of the system deteriorated. In addition, various surfactants have been mixed with the constant temperature water 9 to prevent the generation of bubbles, but in this case, bubbles may occur,
There was a problem that rust and corrosion occurred in the reaction section and flow path.

The purpose of the present invention is to solve the above-mentioned problems with conventional constant temperature devices, and to perform stable and highly accurate measurement and analysis for a long period of time without changing constant temperature water or mixing surfactants. The goal is to make it possible.

[Structure of the Invention] (Means for Solving Problem M Layer) In order to achieve the above object, the present invention provides a removal means for removing impurities from the constant temperature medium in the circulation path of the constant temperature medium.

(Function) Since the present invention has the above configuration, the removal means removes impurities from the constant temperature medium while the constant temperature medium circulates through the circulation path. This improves measurement accuracy by eliminating photometric defects caused by impurities in the constant temperature medium.Also, even if the constant temperature medium is water, there is no need to mix a surfactant as in the past. However, according to the present invention, since impurities in the constant temperature medium are removed during the circulation process of the constant temperature medium, there is no need to replace the constant temperature medium in short cycles as in the past, and therefore a stable high temperature can be achieved for a long period of time. Accuracy can be measured and analyzed.

(Example) The illustrated embodiment will be described below.

FIG. 1 is a schematic diagram showing an embodiment of a constant temperature device using water (pure water) as a constant temperature medium, and the same parts as the conventional device described above with reference to FIG. The same reference numerals are given.

In FIG. 1, constant-temperature water 9 is circulated by a pump 3 in the direction of the arrow shown, and is maintained at a constant temperature by a heater 4 provided in a part of the flow path.

5 is a filter, which removes dust mixed in the water from the heater 4.

6 is a container containing an ion exchange resin, and Ca2◆ contained in the water from the filter 5.

It is designed to remove various ionized substances such as Na''.

Reference numeral 7 denotes a germicidal lamp, which is designed to reduce bacteria and germs contained in the water from the container 6.

8 is a deaerator, which removes gases such as OS, CO, etc. dissolved in the water from the germicidal lamp 7.

According to the above-described device, in the process of water circulating through the circulation path IO, first, dirt is removed by the filter 5, and then various ionized substances are removed by the ion exchange resin in the container 6. Next, bacteria and the like are reduced by a sterilizing lamp 7, and then gas is removed by a deaerator 8, so that clean, constant-temperature water is constantly circulated and supplied to the reaction section 1. This eliminates photometric problems caused by impurities such as dust in the water, improving measurement accuracy, and eliminates the need to mix surfactants into water as in the past. With Water Bag A, since impurities in the water are removed during the circulation process, there is no need to replace the constant temperature medium at short intervals as in conventional methods, and this allows for long-term stable and highly accurate measurement and analysis. can be done.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above-mentioned embodiment, and can be modified and used as appropriate within the scope of the gist of the present invention.

For example, filter 5. Ion exchange resin6. Germicidal lamp7. The necessary air supply devices AT8 may be selected and used as appropriate, and the order in which they are installed in the flow path may be changed as appropriate.

[Effects of the Invention] As detailed above, according to the present invention, stable and highly accurate measurement and analysis can be performed for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an example of a constant temperature device using water (pure water) as a constant temperature medium, Fig. 2 is a schematic diagram showing a conventional example of a constant temperature device, and Fig. 3 is a water constant temperature method. 1 is a schematic diagram of a detection system in a general analyzer. 1... Reaction section, 2... Reaction cell, 3... Pump,
4... Heater, 5... Filter, 6... Container containing ion exchange resin, 7... Germicidal lamp, 8... Deaeration 'J' place, 9... Constant temperature water, lO. ...Circulatory route. Agent Patent Attorney Nori Chika Kyodo
Norio Ogo Figure 1 Figure 2 Figure 3

Claims (4)

[Claims] (1) In the constant temperature device of the analyzer, a constant temperature medium is circulated at a constant temperature in order to form a circulation path for a constant temperature medium to the reaction section and keep the reaction temperature in the reaction cell contained in the reaction section constant. A constant temperature device for an analytical device, characterized in that a removing means for removing impurities from the constant temperature medium is provided in the circulation path. (2) When the constant temperature medium is water, the constant temperature device for an analyzer according to claim 1, wherein the removing means is constituted by any one of a filter, an ion exchange resin, a germicidal lamp, and a deaerator. . (3) When the constant temperature medium is water, the constant temperature device for an analyzer according to claim 1, wherein the removing means is constituted by any combination of a filter, an ion exchange resin, a germicidal lamp, and a deaerator. . (4) The constant temperature device for an analyzer according to claim 3, wherein the removing means first arranges a filter with respect to the flow direction of the constant temperature medium.