Measurement cell

The present invention relates to a measurement cell for optically measuring an analyte included in a sample.

So far, as a measurement cell used for an optical measurement on a sample, there has been proposed a prismatic glass cell configured to provide an optical window portion with a concave surface, for preventing the optical window portion positioned at the side face of the measurement cell from getting dirty or damaged (for example, Patent Document 1).

Patent Document 1 Japanese Laid-Open Patent Publication No. Hei 10-273331

However, there are some problems in the optical window portion of the cell described in the above patent document 1: the optical window portion is always exposed to the outside and the optical window portion cannot be protected sufficiently from dirt and damage, and such dirt and damage attached to the optical window portion cause error in measurement.

Thus, the present invention aims to provide a measurement cell capable of solving the conventional problems such as the one mentioned above, and of preventing measurement error due to dirt and damage by protecting the optical window portion.

To solve the above problems, a measurement cell of the present invention is configured to include:

a sample holding part for holding a sample;

an opening part for supplying the sample to the inner portion of the sample holding part;

an optical window portion for allowing light to enter the sample holding part and allowing light to exit the sample holding part;

a protection cover for protecting the optical window portion, provided movably along the circumference of the sample holding part; and

a first protection-cover-holding part for holding the protection cover at a position where the optical window portion is covered with the protection cover.

Based on such a configuration, not only the optical window portion can be protected by the protection cover, but also error in measurement due to dirt and damage on the optical window portion can be prevented further reliably by moving the protection cover to the position where the optical window portion is exposed upon measurement.

Based on the measurement cell of the present invention, the optical window portion can be protected without being exposed when not in measurement, and the measurement error due to dirt and damage on optical window portion can be prevented further reliably.

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