Sample liquid metering device

Abstract

The present invention provides a sample liquid measuring device capable of measuring with high precision even when measuring a small amount of sample liquid, and capable of preventing errors caused by droplets falling from a sample liquid introduction pipe after the sample liquid is measured. The sample liquid metering device comprises: a metering container for metering sample liquid; a sample liquid inlet pipe for introducing the sample liquid into the metering container; and a sample liquid outlet pipe for connecting the front end to the bottom of the metering container The measurement container is inserted into the measurement container in a contact manner, and the sample liquid in the measurement container is led out of the measurement container. The sample liquid introduction tube has an inlet opening on the side of the measurement container, and the Installed downward, the sample liquid present in the measurement container at a position higher than the position where the introduction port is formed is returned through the sample liquid introduction tube.

Description

technical field [0001] The present invention relates to a sample liquid measuring device for measuring a predetermined amount of sample liquid. Background technique [0002] In order to measure only 10 ml of a sample liquid such as a reagent for measurement within a certain period of time, a sample liquid measuring device 100A disclosed in Patent Document 1 is used. The sample liquid metering device 100A includes: a metering tube 1A for measuring sample liquid; a sample liquid introduction tube 2A inserted into the metering tube 1A from above for transferring the sample liquid L from a sealed sample The liquid storage container T is introduced into the metering tube 1A; and the sample liquid outlet tube 3A is inserted into the bottom of the metering tube 1A to lead out the metered sample liquid L to the outside. The measurement operation of the sample liquid measurement device 100A will be described below. First, Image 6 As shown in (a), by pressurizing the inside of the s...

AI Technical Summary

Problems solved by technology

At this time, in order to measure the sample liquid with the same accuracy as conventional ones, it is necessary to make the positional accuracy of the sample liquid introduction tube 2A higher than the conventional positional accuracy, and such an adjustment operation is very difficult.

In addition, when the size of the sample liquid measuring device 100A is reduced, since the two tubes of the sample liquid introduction tube 2A and the sample liquid outlet tube 3A are inserted into the metering tube 1A, the sample liquid introduction tube 2A and the sample liquid outlet tube 3A are inserted into the metering tube 1A. The proportion of the volume and surface area occupied by the tube 3A in the metering tube 1A is relatively increased, so that the surface tension of the sample liquid is more likely to act, so that, for example, the amount of sample liquid that adheres to the tube surface and cannot be discharged increase

That is, even if the amount of the sample liquid L measured by the metering tube 1A is accurate, it is likely to become an inaccurate amount when the measured sample liquid is drawn out.

[0007] On the other hand, in the sample liquid metering device 100A described in Patent Document 2, the sample liquid is led out from the bottom of the metering tube 1A to the outside, so even if the metering is performed at a predetermined liquid level, the sample liquid does not mix with the sample liquid. Correspondingly, the valve set on the outlet pipe 3A will also produce metering errors

[0008] In addition, in the sample liquid measuring device 100A described in Patent Document 1 and Patent Document 2, the sample liquid introduction tube 2A is installed above the metering tube 1A, and the sample liquid L is introduced into the metering tube 1A by natural fall. Therefore, when the measurement of the sample liquid L is finished and the sample liquid L is exported to the outside, the amount of the liquid led to the outside may change due to the droplet of the sample liquid L remaining in the sample liquid outlet tube 2A falling.

Errors are more pronounced when there is such droplet falling, especially for small metered quantities

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