JPH1048221A - Analyzer with cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure a high temperature sample stably and reliably while introducing as it is by air cooling a part of a sample liquid introduction passage to a flow cell through an exhaust fan. SOLUTION: A high temperature sample liquid sucked from a sample tank 1 by a suction pump 3 is introduced from a sampling line 2 into an analyzer body case 4. At first, it is air cooled at a heat-exchange section 22 by an exhaust fan 5 and then subjected to defoaming in a deforming tank 6. In the deforming tank 6, foams ascend through a sample liquid and returns back to the sample tank 1 through a return path 10. Consequently, foam-free sample liquid on the bottom is introduced through a sampling line 21 into a flow cell 8 by on/off operation of a solenoid valve 7 and measured. In other words, a large and expensive cooler is not required and the installation space can be saved and highly reliable measurements can be obtained by introducing a high temperature sample liquid as it is over a wide temperature range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a spectrometer equipped with a cooling device for measuring a multicomponent aqueous solution or the like in which air bubbles tend to be generated particularly at high temperatures.

[0002]

When an analytical measurement is performed by introducing a sample liquid into a flow cell from the outside, the measured value may be greatly affected by the temperature of the sample liquid depending on the measuring method. The effect is remarkable in spectroscopic methods such as infrared spectroscopy.

For example, in the case of a hydrochloric acid-hydrogen peroxide aqueous solution,
When the temperature becomes high, a large amount of air bubbles are generated, and it is difficult to completely deaerate the air even through the deaeration tank.Furthermore, fine air bubbles are generated due to the shock of the opening and closing operation of the solenoid valve provided in the sampling line. The measurement data is often affected by these bubbles. Therefore, in order to perform more accurate measurement, it is desirable to lower the liquid temperature and control the temperature.

For this reason, conventionally, a large-sized cooler or a temperature control device was provided as a processing means before introducing a sample into the analyzer, and the liquid temperature was adjusted. However, these devices are generally large and expensive, and require space for installation.In addition, piping between the sample tank, the cooling device, and the analyzer is also required, which causes many problems such as liquid leakage. Was.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide an inexpensive analyzer with a cooling device that can introduce a high-temperature sample as it is without passing through a cooler or a temperature control device and measure the temperature stably and reliably.

[0006]

According to the present invention, means for solving the above-mentioned problems are constituted as follows. That is, an analyzer for introducing a sample liquid into the flow cell from the outside to perform optical analysis and measurement, and a part of the introduction path of the sample liquid to the flow cell is air-cooled by an exhaust fan provided in the analyzer main body. It is characterized by having such a configuration.

A part of the sample liquid introduction passage is air-cooled by an exhaust fan for ventilating the inside of the analyzer main body, so that the sample liquid is brought into a temperature state in which bubbles are not easily generated, and then introduced into the flow cell. You.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the analyzer with a cooling device of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of a spectrometer with a cooling device capable of stably measuring a multi-component aqueous solution or the like in which bubbles easily occur at a high temperature. Reference numeral 1 denotes a sample tank for storing a sample liquid; A sampling line, 3 is a suction pump, 4 is an analyzer main body case, 5 is an exhaust fan provided in the analyzer main body case 4, and 22 is a heat exchange formed by spirally winding a part of the sampling line 2. Part, 6 is a defoaming tank, 7 is a solenoid valve,
Reference numeral 8 denotes a flow cell, 9 denotes a detector, and a sample solution containing air bubbles discharged from the defoaming tank 6 and the flow cell 8 is supplied to a reflux path 10.
Is returned to the sample tank 1 via

In the analyzer with the cooling device thus configured, the high-temperature sample liquid sucked up from the sample tank 1 by the suction pump 3 is introduced into the analyzer main body case 4 from the sampling line 2, and is first heated. After the air is cooled by the exhaust fan 5 in the exchange unit 22, the air is introduced into the defoaming tank 6 and defoamed. In the defoaming tank 6, the bubbles in the sample liquid rise and return to the sample tank 1 from the return path 10, and the sample liquid without bubbles at the bottom is moved to the sampling line 2 by opening and closing the solenoid valve 7.
1 and introduced into the flow cell 8 and measured.

When the temperature of the sample liquid is high, a chemical reaction occurs during the liquid feeding and foaming is apt to occur, and bubbles may be generated even after passing through the defoaming tank 6. Although fine bubbles are likely to be generated even by the shock of the opening and closing operation, in the present invention, the exhaust fan 5 for ventilating the inside of the analyzer main body case 4 air-cools the sample liquid at the stage of introducing the sample liquid to reduce the cause of the bubble generation. Since the sample solution has been removed, a sample solution having extremely few bubbles can be introduced into the flow cell 8. It should be noted that even in this case, there is a concern that a slight amount of air bubbles may be introduced into the flow cell 8, but this point is resolved by providing a certain standby time and releasing the air to the upper portion to start the subsequent measurement. I can deal with it.

As described above, by using the exhaust fan 5 for air cooling of the sample liquid, the apparatus for cooling the sample liquid can be provided at extremely low cost without any significant improvement. Therefore, there is no need to install a large and expensive cooling device or temperature control device, so that space can be saved, and a high-temperature sample solution can be directly introduced into the analyzer to obtain highly reliable measured values. This makes it possible to measure a sample liquid in a wide temperature range from a low temperature to a high temperature. In addition, since external piping for cooling is not required, causes of troubles such as liquid leakage are reduced. Then, since the sample liquid itself is cooled in the initial stage of the introduction of the sample liquid, slack in the pipe due to a temperature change inside the analyzer is reduced, and liquid leakage is also reduced.

FIGS. 2 to 4 show examples of the structure of the heat exchange section 22 provided in the sampling line 2. FIG. 2 shows a structure in which a tube is spirally wound so that its surface area can be set large. 3 further connects the spiral tube to the joint 221.
FIG. 4 shows three thin tubes combined in parallel with a joint 221. In addition, although not shown, a tube provided with a radiation fin may be used. In addition, PFA (fluororesin) or the like is preferable as the material of the tube.

FIG. 5 shows the structure of the analyzer from which the defoaming tank 6 has been removed. Depending on the conditions of use, a sufficient bubble removing effect can be obtained even with such a structure. FIG. 6 shows the heat exchanger 22 arranged outside the analyzer main body case 4.

[0014]

As described above, according to the analyzer with the cooling device of the present invention, a part of the introduction path of the sample liquid to the flow cell is air-cooled by the exhaust fan provided in the analyzer main body. As a result, a cooling function can be provided at low cost, and there is no need to provide an expensive cooling device or temperature control device outside, and a high-temperature sample solution can be directly introduced into the analyzer,
Highly reliable measurement values can be obtained. Since external piping is not required, trouble occurrence factors such as liquid leakage are reduced. Further, since the sample liquid is cooled, troubles such as loose pipes and liquid leakage due to temperature changes inside the analyzer are reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of an analyzer with a cooling device of the present invention.

FIG. 2 is a drawing showing an example of the heat exchange unit.

FIG. 3 is a drawing showing another example of the heat exchange unit.

FIG. 4 is a drawing showing another example of the heat exchange unit.

FIG. 5 is a configuration diagram showing another embodiment of the analyzer with a cooling device.

FIG. 6 is a configuration diagram showing another embodiment of the analyzer with the cooling device.

[Explanation of symbols]

2 ... Introduction path, 22 ... Partial, 4 ... Analyzer main body, 5 ... Exhaust fan, 8 ... Flow cell.

Claims (1)

[Claims] 1. An analyzer in which a sample liquid is externally introduced into a flow cell to perform optical analysis and measurement, wherein an exhaust fan provided with a part of a sample liquid introduction path to the flow cell in a main body of the analyzer. An analyzer with a cooling device, characterized in that the analyzer is configured to be cooled by air.