초록 ▼

A quantitative liquid sampling instrument comprises a main body of a pipet device which includes a pipet tip having an opening at its lower end for sucking and discharging a liquid. The pipet tip being in a shape of a tube shell having a cavity for holding a liquid sucked therein through the opening

A quantitative liquid sampling instrument comprises a main body of a pipet device which includes a pipet tip having an opening at its lower end for sucking and discharging a liquid. The pipet tip being in a shape of a tube shell having a cavity for holding a liquid sucked therein through the opening and being made of a transparent or semi-transparent material. The main body further comprising a device for applying a gas pressure for sucking or discharging the liquid to or from the inside of the cavity of the pipet tip. The instrument further comprising a liquid level detecting device installed under the main body of the pipet device; a vertical movement control device for moving the main body of the pipet device or a container of the liquid to make them relatively approach one another until a predetermined length of the lower end of the pipet tip is dipped into the liquid in the container; and a computing device for computing the end point of relative approaching movement of the main body of the pipet device and the container and for outputting a signal regarding the end point to the vertical movement control device.

대표청구항 ▼

A quantitative liquid sampling instrument comprising: (a) a main body of a pipet device comprising: a pipet tip having a means defining an opening at a lower end of the pipet tip for sucking and discharging a liquid, said pipet tip being in a shape of a tube shell and having a cavity for holding a l

A quantitative liquid sampling instrument comprising: (a) a main body of a pipet device comprising: a pipet tip having a means defining an opening at a lower end of the pipet tip for sucking and discharging a liquid, said pipet tip being in a shape of a tube shell and having a cavity for holding a liquid sucked therein through the opening, said pipet tip being made of a transparent or semi-transparent material; (b) means for applying a gas pressure for sucking or discharging the liquid to or from an inside of the cavity of the pipet tip; (c) liquid level detecting means mounted on a frame of the main body of the pipet device, said liquid level detecting means comprising light projecting means for projecting light to the lower end of the pipet tip and light receiving means for receiving the light reflected by the lower end of the pipet tip, and employing an intensity of the received light as a detection information; (d) vertical movement control means for moving the main body of the pipet device or a container of the liquid so as to make the main body of the pipet device and the container relatively approach one another until a length of a lower end of the pipet tip is dipped into the liquid in the container; and (e) computing means for computing an end point of relative approaching movement of the main body of the pipet device and the container and for outputting a signal regarding the end point to the vertical movement control means, wherein the computing means for computing the end point of the relative approaching movement of the main body of the pipet device and the container comprises means for detecting a substantially decrease int he intensity of the reflected light received by the light receiving means on contact of the pipet tip with the liquid and stopping the relative approaching movement of the main body of the pipet device and the container.