JP2003222630A - Liquid-sucking apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid-sucking apparatus for accurately detecting remainder. <P>SOLUTION: The liquid-sucking apparatus comprises a suction section for sucking liquid that is accommodated in a container, a liquid level sensor for detecting the height of the liquid in the container, an accommodation section for accommodating the correlation relationship between the liquid level height and the accommodation volume of the container in advance, an inputting section for inputting the type of liquid, a correction section for correcting the correlation relationship according to the type of the inputted liquid, an operation section for calculating the remainder of liquid in the container from the detected liquid level height and the corrected correlation relationship, and an output section for outputting the calculation result. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid suction device, and in particular, it is used for an analysis device for quantitatively sucking and analyzing a liquid reagent from a container.

[0002]

2. Description of the Related Art As prior art related to the present invention,
The following are known. Container transfer control means for sending a required sample container to a sampling position, sample aspirating and dispensing means for aspirating a sample to be analyzed by a sampling probe at the sampling position, and transferring the sampling probe between the sampling position and the dispensing position. An integrated control means for controlling the operation of the probe drive control means, the container transfer control means, the sample aspirating and dispensing means and the probe drive control means and having a central processing function and a data storage function, and a sample container for the integrated control means. And an input means for inputting required data of the shape, and the integrated control means calculates the amount of sample sucked into the sampling probe from the required amount of sample for each measurement item (for example, Japanese Laid-Open Patent Publication No. (See Japanese Patent Publication No. 174766).

An arithmetic / control circuit is provided for automatically calculating the reagent remaining amount calculation formula by performing an arithmetic operation using the reagent suction amount by the dispenser and the nozzle movement amount, and other than the reagent container scheduled for the apparatus. Even when a reagent container is used, the reagent remaining amount can be properly calculated, the remaining amount can be displayed, and an appropriate analysis work can be carried out (see, for example, JP-A-8-304411).

Liquid collecting means for collecting the liquid contained in the container, liquid level position detecting means for detecting the liquid surface position in the container, container type input means for inputting the type of the container containing the liquid to be collected, A relational expression storage unit that stores in advance a relational expression between the liquid level position and the residual liquid amount in each container type is provided, and the liquid level position detected by the liquid level detection unit and the container type input by the container type input unit An analyzer that detects the amount of residual liquid in the container by the relational expression corresponding to (see, for example, Japanese Patent Laid-Open No. 2000-46624).

[0005]

Generally, in a liquid aspirator used in an automatic analyzer such as a blood analyzer, a pipette is inserted into a container containing a liquid reagent, and the reagent aspirated from the pipette is supplied to a blood sample container. The operation is done automatically. Then, in order to effectively use the reagent and replenish the reagent in a timely manner, the shape of the reagent container is stored in advance and the remaining amount of the reagent is determined from the relationship between the shape and the liquid level, as in the above-described conventional technique. The method of monitoring has been adopted.

However, the physical properties of the reagent contained in the container, that is, the viscosity and the surface tension of the container wall,
If the wettability is different, the liquid level will be different even if the remaining amount is the same. Therefore, there is a problem that it is difficult to accurately monitor the remaining amount only by grasping the container shape and the liquid level height.

The present invention has been made in consideration of such circumstances, and corrects the remaining amount obtained from the shape of the container and the height of the liquid surface according to the kind of the reagent, that is, the physical property of the reagent, It is intended to provide a liquid suction device capable of detecting the remaining amount with high accuracy.

[0008]

According to the present invention, there is provided a suction unit for sucking a liquid contained in a container, a liquid level sensor for detecting a liquid level of the liquid in the container, a liquid level and a container containing the container. A storage unit that stores the correlation with the volume in advance, an input unit that inputs the type of liquid, a correction unit that corrects the correlation according to the type of the input liquid, and a detected liquid level height and correction The present invention provides a liquid suction device including a calculation unit that calculates the remaining amount of liquid in a container from the correlation thus obtained and an output unit that outputs the calculation result.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a suction unit includes a pipette for sucking a liquid, a suction pump connected to the pipette, a pipette moving unit for inserting and moving the pipette up and down in a container, and a suction pump. The pipette moving unit is provided with a control unit that drives and controls, and the control unit has a computing unit that calculates the pipette moving amount corresponding to the desired suction amount from the corrected correlation, and lowers the pipette by the calculated moving amount. You may drive a suction pump by this. The pipette moving unit may include a stepping motor that moves the pipette up and down, and the up and down distance of the pipette may be determined by the number of driving pulses of the stepping motor.

Further, according to another aspect of the present invention, a suction unit for sucking the liquid contained in the container, a liquid level sensor for detecting the liquid level of the liquid in the container, and a plurality of types of containers and liquids. Storage unit that stores the correlation between the liquid level and the storage volume of the container in advance, an input unit that inputs the type of container and liquid, the detected liquid level and the type of container and liquid that were input The present invention provides a liquid suction device including a calculation unit that calculates the remaining amount of liquid in a container from the correlation corresponding to the above, and an output unit that outputs the calculation result.

Here, the suction unit can be composed of, for example, a pipette, a device for moving the pipette vertically and horizontally, a suction pump connected to the pipette, and the like. The container is made of glass or resin, for example, and has a cylindrical shape.
The bottom includes a flat bottom, a hemispherical bottom, or a conical bottom. Further, as the liquid level sensor, a known capacitance detection type can be used. A keyboard, a bar code reader, or any other known device can be used as the input unit. The storage unit, the correction unit, and the calculation unit are a CPU,
It can be integrally configured by a microcomputer including ROM and RAM. The output section has a CRT, LCD, EL
A display device such as D and a printing device such as an inkjet printer or a laser printer can be used.

Embodiments The present invention will be described in detail below with reference to the embodiments shown in the drawings. This does not limit the present invention. Configuration of First Embodiment Liquid Suction Device FIG. 1 is a configuration explanatory view showing a configuration of a first embodiment of a liquid suction device of the present invention. In the figure, the pipette 1 has its base end held by a pipette holding member 2, and a suction tube 3 is inserted through a through hole 2 a provided in the pipette holding member 2.
It is connected to the. The pipette 1 is made of a conductive material, for example stainless steel.

The pipette holder 2 is mounted on a lifting device 4, and the lifting device 4 is mounted on a horizontal moving device 5. The lifting device 4 includes a vertical screw shaft 7 and a guide shaft 8 installed on the frame 6, a stepping motor 9 that rotates the screw shaft 7, and a lifting block 10 that moves up and down in the arrow Z direction by the rotation of the screw shaft 7. .

The elevating block 10 has a screw hole that penetrates vertically, and is engaged with the screw shaft 7 by the screw hole. The guide shaft 8 penetrates the elevating block 10 vertically. The pipette holding member 2 is fixed to the elevating block 10 via the arm 11. Arm 11
Is made of insulator.

The horizontal moving device 5 includes a screw shaft 13 and a guide shaft 14 installed in the frame 12 in the horizontal direction, a stepping motor 15 for rotating the screw shaft 13, and a screw shaft 1.
A horizontal moving block 16 is provided which reciprocates in the arrow X direction by the rotation of 3. The frame 6 of the lifting device 4 is fixed to the horizontal moving block 16. The horizontal moving block has a screw hole penetrating horizontally and engages with the screw shaft 13 by the screw hole, and the guide shaft 14 horizontally penetrates the horizontal moving block 16.

A reagent container 17 containing a liquid reagent to be quantified, a reagent container 18 for receiving the liquid reagent to be quantified, and a cleaning container 30 for cleaning the pipette 1 are provided below the pipette 1 in the frame 12. It is installed in.

Electric Circuit of Liquid Suction Device FIG. 2 is a block diagram showing an electric circuit of the embodiment shown in FIG. As shown in the figure, the control unit 20 includes a liquid level detection unit 2
1 and the output from the input unit 22, and outputs a drive command for each stepping motor to the drive unit 25 that drives the stepping motor 24 for the pump 23 and the stepping motors 9 and 15 for moving the pipette 1. , Output section 2
The display contents of various kinds of information are output to 6.
Here, the input unit 22 is a keyboard for inputting the type of reagent and its container and various quantitative conditions, and the output unit 26 is an LCD for displaying the remaining amount of reagent and various information.

The pump 23 is a syringe pump and is connected to the suction tube 3. The suction tube 3 is made of silicone rubber. The drive unit 25 includes a driver circuit for driving the stepping motors 9, 15, 24. The control unit 20 includes a data storage unit 20a and a calculation unit 2
0b and is composed of a microcomputer including a CPU, a ROM, and a RAM.

In the liquid level detector 21, a high frequency oscillator 300 having an oscillation frequency of 650 kHz is connected to a conductor 113 connected to the pipette 1 via a resistance R of 34 kΩ, and a band pass filter 302 is also connected. Filter 3
On the output side of 02, a detector 304, a differentiator 306, a comparator 3
08 are connected in series.

The sample container 17 is placed on a grounded metal surface, and the capacitance C between the pipette 1 and the grounded surface depends on whether or not the tip of the pipette 1 contacts the liquid surface in the sample container 17. Change. Therefore, a high-frequency signal having an amplitude corresponding to the capacitance C is obtained at the output of the RC type integrating circuit formed by the resistor R and the capacitance C, that is, at the input side of the filter 302.

This high frequency signal is passed through the band pass filter 302.
Then, the signal is detected by the detector 304 and converted into a DC signal. Furthermore, this DC signal is differentiator 30
6, the level change of the DC signal is detected, and the comparator 3
08 is compared with a predetermined value.

That is, when the pipette 1 comes into contact with the liquid surface, the capacitance C is short-circuited by the pipette 1 and the liquid, and the DC signal level becomes lower than a predetermined value. Therefore, it is detected that the pipette 1 comes into contact with the liquid surface. The comparator 308 outputs the detection signal.

Relationship between Liquid Level and Remaining Liquid Level FIG. 3 shows the relationship obtained from the measured value of the liquid level height Y with respect to the contained liquid amount Q of the container A having a generally cylindrical shape. The liquid level height Y has the maximum rising height of the pipette 1 as the origin, and the number of drive pulses of the stepping motor 9 required until the tip of the pipette 1 contacts the frame 12 from the origin is the maximum movement distance Ym. When descending by the number of pulses Yp from the origin, Y = Ym-Yp (1). That is, Y represents the liquid level height from the frame 12 by the drive pulse of the stepping motor 9.

In FIG. 3, the straight line (Aa) represents the case where the liquid contained in the container A is the reagent a which is most frequently used. The straight line (A-b) represents the case where the liquid contained in the container A is the reagent b, and the straight line (A-c) represents the case where the liquid contained in the container A is the reagent c.

FIG. 4 shows the relationship obtained from the measured values of Q and Y for the cylindrical container B having a conical tip. In FIG. 4, the curve (Ba) shows the liquid contained in the container B as the reagent a, the curve (Bb) shows the liquid contained in the container B as the reagent b, and the curve (B-c) shows the container B. The contained liquid is reagent c
, Respectively.

As can be seen from FIG. 3, when the straight line (A-a) is translated leftward by .DELTA.Q1, it becomes a straight line (A-b), and when it is translated rightward by .DELTA.Q2, it becomes a straight line (A-c). Further, as can be seen from FIG. 4, when the curve (Ba) is translated leftward by ΔQ3, it becomes a curve (Bb), and when it is translated rightward by ΔQ4, it becomes a curve (Bc).

Therefore, in this embodiment, in the data storage unit 20a of FIG. 2, a numerical table representing the straight line (Aa) and the values of ΔQ1 and ΔQ2 and a numerical table representing the curve (Ba) and ΔQ3. ΔQ4 is stored in advance.

Operation of Liquid Suction Device The operation in such a configuration will be described with reference to the flow charts shown in FIGS. First, the frame 12 of FIG.
A container containing the reagent is installed as the reagent container 17 above,
A or B is input and set as the container type U and a, b or c is input and set as the reagent type V from the input unit 22, and a desired suction amount QS and reagent remaining amount QR are input and set (step S1). . When the input reagent container is other than A or B or the type of reagent is other than a, b or c, the output unit 26 displays a warning "input error" (step S2).
S3, S43). Further, when the value obtained by subtracting the desired suction amount QS from the current remaining amount QR is smaller than the dead volume Q0, a warning "remaining reagent amount is absent" is displayed (steps S4 and S43). Here, the dead volume means the minimum remaining amount that cannot be sucked. Then, when "start" is input, the pipette 1 once rises to the highest position (origin) (steps S5 and S6). Next, the pipette 1 descends until the liquid level is detected by the liquid level detection unit 21 (step S7), and when the liquid level is detected (step S8), it is applied to the stepping motor 9 from the origin to the liquid level detection. The liquid level height Y is calculated from the number of drive pulses thus obtained using the equation (1) (step S9). When the liquid level is not detected in step S8, the pipette 1 is pulled back to the origin and a warning "liquid level detection is impossible" is displayed (steps S44 and S43).

In step S1, the container A is designated as the container type U.
Is input and set (step S10), and when the reagent a is input and set as the reagent type V (step S1)
1), a value obtained by reading the liquid amount Q corresponding to the liquid surface height Y from the numerical table representing the straight line (Aa) of FIG. 3 stored in the data storage unit 20a and subtracting the desired suction amount QS Is the remaining amount QR after suction (step S13). Next, after it is confirmed that the remaining amount QR is equal to or greater than the dead volume Q0 (step S14), the liquid level height Y with respect to the desired suction amount, that is, the necessary pipette descending distance is calculated from the relationship of FIG. 3 ( Step S15). Next, when the pipette 1 descends (step S16) and reaches the calculated value (step S17), the pump 23 operates and the reagent is aspirated (step S18).

When the desired amount of reagent is sucked (step S19), the reagent remaining amount QR is displayed on the output unit 26,
The pipette 1 ascends, moves onto the sample container 18, and discharges the aspirated reagent to the sample container 18 (step S2).
0-S23). Next, the pipette 1 moves to the top of the cleaning container 30 and then descends to be cleaned in the cleaning container 30 (steps S24 to S26). Next, the pipette 1 moves up and moves to above the reagent container 17, and the suction operation ends (steps S27 to S29). When the remaining amount QR is smaller than Q0 in step S14, step S17
If the pipette 1 does not descend to the calculated value in step S21, and if the desired amount of reagent is not aspirated in step S19, the operation is stopped, the pipette 1 is pulled back to the origin, and a warning "failure has occurred" is displayed ( Step S
45, S46, S47).

Next, in step S11, when the reagent type V is not a but b, (step S3
0), the liquid amount Q corresponding to the liquid surface height Y is read from the numerical table representing the straight line (Aa) in FIG.
The value obtained by subtracting the desired suction amount QS from Q-ΔQ1 is set as the remaining amount QR after suction (steps S31 and S3).
2). Then, the routine returns to step S14.

Next, in steps S11 and S30,
When the reagent type V is neither a nor b, but c, the liquid amount Q with respect to the liquid level Y is read from the numerical table representing the straight line (Aa) in FIG. Then, Q + ΔQ2 is calculated, and the value obtained by subtracting the desired suction amount QS is set as the remaining amount QR after suction (steps S33, S34). Then, the routine returns to step S14.

Next, when the type U of the container is not A but B in step S10, it is determined that the reagent V is a (step S35) and the curve of FIG. 4 stored in the data storage unit 20a ( The liquid amount Q corresponding to the liquid surface height Y is read from the numerical table representing B-a), and the value obtained by subtracting the desired suction amount QS is set as the remaining amount QR after suction (steps S36, S).
37). Then, the routine returns to step S14.

Next, in step S35, if the reagent type V is not a but b (step S3
8), the liquid amount Q corresponding to the liquid surface height Y is read from the numerical table representing the curve (Ba) of FIG. 4 stored in the data storage unit 20a, and the calculation unit 20b reads Q-ΔQ3.
Is calculated and the value obtained by subtracting the desired suction amount QS is calculated as the remaining amount Q after suction.
R (steps S39, S40). Then, the routine returns to step S14.

Next, in steps S35 and S38,
When the reagent type V is neither a nor b, but c, the liquid amount Q with respect to the liquid surface height Y is read from the numerical table representing the curve (Ba) in FIG. Then, Q + ΔQ4 is calculated, and a value obtained by subtracting the desired suction amount QS is set as the remaining amount QR after suction (steps S41 and S42). Then, the routine returns to step S14. As described above, the remaining amount of the reagent is properly displayed and the desired amount of the reagent is suctioned and fixed.

Second Embodiment Structure of Second Embodiment In this embodiment , the structure of the liquid suction device and the electric circuit is the same as that of the first embodiment (FIGS. 2 and 2). The data and operation (program) stored in advance in the data storage unit 20 of FIG. 2 are different from those of the first embodiment. That is, in this embodiment, a straight line (A-b) is used instead of the values of ΔQ1 and ΔQ2.
Is stored, and a numerical table showing a straight line (A-c) is stored, and instead of the values of ΔQ3 and ΔQ4,
A numerical value table representing a curve (Bb) and a numerical value table representing a curve (Bc) are stored.

Operation of the Second Embodiment The operation of the second embodiment will be described with reference to the flow charts shown in FIGS. First, a container containing a reagent is installed as the reagent container 17 on the frame 12 of FIG. 1, and A or B is input and set as the type U of the container and a, b or c as the type V of the reagent from the input unit 22. Further, the desired suction amount QS and the desired reagent remaining amount QR are input and set (step S101). In cases other than the input reagent containers A and B,
If the type of reagent is other than a, b, or c, a warning "input error" is displayed by the output unit 26 (step S10).
2, S103, S143). Further, when the value obtained by subtracting the desired suction amount QS from the current remaining amount QR is smaller than the dead volume Q0, a warning "remaining reagent amount is absent" is displayed (steps S104 and S143). Then, when "start" is input, the pipette 1 once rises to the highest position (origin) (steps S105 and S106). Next, the pipette 1 descends until the liquid level is detected by the liquid level detection unit 21 (step S107), and when the liquid level is detected (step S108), it is applied to the stepping motor 9 from the origin to the liquid level detection. The liquid level height Y is calculated from the calculated number of drive pulses using the equation (1) (step S1).
09). If the liquid level is not detected in step S108, the pipette 1 is pulled back to the origin and a warning "liquid level detection is not possible" is displayed (step S14).
4, S143).

In step S1, the container A is selected as the container type U.
Is input and set (step S110), and when the reagent a is input as the reagent type V (step S11).
1), a value obtained by subtracting the desired suction amount QS from the liquid amount Q corresponding to the liquid level height Y read out from the numerical table representing the straight line (Aa) in FIG. 3 stored in the data storage unit 20a. The remaining amount after suction is QR (step S113). Next, after it is confirmed that the remaining amount QR is equal to or greater than the dead volume Q0 (step S114), the liquid level height Y with respect to the desired suction amount, that is, the pipette descending distance is calculated from the relationship of FIG. 3 (step S115). . Next, the pipette 1 is lowered (step S116), and when the pipette 1 is lowered to the calculated value (step S117), the pump 23 is operated to suck the reagent (step S118).

Then, when a desired amount of reagent is aspirated (step S119), the reagent remaining amount QR is displayed on the output unit 26, the pipette 1 is moved up, and is moved onto the sample container 18,
The aspirated reagent is discharged to the sample container 18 (steps S120 to S123). Next, pipette 1 is cleaning container 3
After moving to 0, it descends and is washed in the washing container 30 (steps S124 to S126). Next, the pipette 1 moves up and moves to above the reagent container 17, and the suction operation ends (steps S127 to S129). If the remaining amount QR is smaller than Q0 in step S114,
If the pipette 1 does not descend to the calculated value in step S117, or if the desired amount of reagent is not aspirated in step S119, the operation is stopped, the pipette 1 is pulled back to the origin, and a warning "failure has occurred" is displayed. (Steps S145, S146, S147).

Next, in step S111, when the reagent type V is not a but b (step S13
0), the liquid amount Q corresponding to the liquid surface height Y is read from the numerical table representing the straight line (A-b) in FIG. 3 to obtain the desired suction amount QS.
The value obtained by subtracting is the remaining amount QR after suction (step S13).
1, S132). Then, the routine proceeds to step S114.
Return to.

Next, in steps S111 and S130, when the reagent type V is not a, b, or c, the liquid level height Y is calculated from the numerical table representing the straight line (A-c) in FIG. The amount Q of liquid is read out and the value obtained by subtracting the desired suction amount QS is set as the remaining amount QR after suction (step S13).
3, S134). Then, the routine proceeds to step S114.
Return to.

Next, when the type U of the container is B instead of A in step S110, the reagent is a (step S135) and the curve (B in FIG. 4 stored in the data storage unit 20a is stored. The liquid amount Q corresponding to the liquid surface height Y is read from the numerical value table representing −a), and a value obtained by subtracting the desired suction amount QS is set as the remaining amount QR after suction (step S13).
6, S137). Then, the routine proceeds to step S114.
Return to.

Next, in step S135, when the reagent type V is not a, but b (step S13
8), a value obtained by subtracting the desired suction amount QS from the liquid amount Q corresponding to the liquid surface height Y is read from the numerical table representing the curve (Bb) of FIG. 4 stored in the data storage unit 20a. The remaining amount after suction is QR (steps S139 and S140).
Then, the routine returns to step S114.

Next, in steps S135 and S138, when the reagent type V is not a, b, or c, the liquid level height Y is calculated from the numerical table showing the curve (B-c) in FIG. The liquid amount Q with respect to is read and the value obtained by subtracting the desired suction amount QS is set as the remaining amount QR after suction (step S14).
1, S142). Then, the routine proceeds to step S114.
Return to. As described above, the remaining amount of the reagent is properly displayed and the desired amount of the reagent is suctioned and fixed.

In the first and second embodiments, the input section 22 has a bar code reader so that the bar code representing the "type of container and the type of reagent" attached to the reagent container 17 can be read by it. Then, the operation of inputting these from the keyboard becomes unnecessary. Further, the reagent container 17 and the sample container 18 shown in FIG. 1 may be carried in and out of each predetermined position of the frame 12 by a carrying device such as a conveyor. Further, the first embodiment is suitable when the correlation between the liquid amount in the container and the liquid level height changes by parallel movement depending on the type of reagent as shown in FIGS. 3 and 4, and the second embodiment It is suitable when the above correlation does not change in parallel depending on the type of reagent.

[0046]

According to the present invention, since the correlation between the liquid level height and the storage volume of the container is corrected according to the type of liquid, the remaining amount can be detected with high accuracy from the liquid level height. You can

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing a liquid suction device of a first embodiment of the present invention.

FIG. 2 is a block diagram showing an electric circuit according to the first embodiment of the present invention.

FIG. 3 is a graph showing the relationship between the liquid amount and the liquid surface height of the container used in the present invention.

FIG. 4 is a graph showing the relationship between the liquid amount and the liquid surface height of the container used in the present invention.

FIG. 5 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of the second embodiment of the present invention.

FIG. 9 is a flowchart showing the operation of the second embodiment of the present invention.

FIG. 10 is a flowchart showing the operation of the second embodiment of the present invention.

[Explanation of symbols]

1 pipette 2 Pipette holder 2a through hole 2b side hole 3 suction tube 4 Lifting device 5 Horizontal movement device 6 frames 7 screw shaft 8 Guide shaft 9 Stepping motor 10 Lift block 11 arms 12 frames 13 screw shaft 14 Guide shaft 15 Stepping motor 16 Horizontal movement block 17 Reagent container 18 reagent containers

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Claims (6)

[Claims] 1. A suction unit for sucking the liquid contained in the container, a liquid level sensor for detecting the liquid level of the liquid in the container,
A storage unit that stores in advance the correlation between the liquid level and the storage volume of the container, an input unit that inputs the type of liquid, and a correction unit that corrects the correlation according to the type of the input liquid,
A liquid suction device comprising: a calculation unit that calculates the remaining amount of liquid in the container from the detected liquid level height and a corrected correlation; and an output unit that outputs the calculation result. 2. A suction unit, a pipette for sucking a liquid, a suction pump connected to the pipette, a pipette moving unit for inserting and moving the pipette up and down in a container, and a drive control for the suction pump and the pipette moving unit. The control unit has a calculation unit that calculates the pipette movement amount corresponding to a desired suction amount from the corrected correlation, and drives the suction pump by lowering the pipette by the calculated movement amount. The liquid suction device according to claim 1. 3. The liquid suction device according to claim 2, wherein the pipette moving unit includes a stepping motor for moving the pipette up and down, and the up and down distance of the pipette is determined by the number of driving pulses of the stepping motor. 4. A suction unit for sucking the liquid contained in the container, a liquid level sensor for detecting the liquid level of the liquid in the container,
A storage unit that stores in advance the correlation between the liquid level and the volume of each container for a plurality of types of containers and liquids, an input unit that inputs the types of containers and liquids, and the detected liquid level heights are input. A liquid suction device comprising: a calculation unit that calculates the remaining amount of liquid in the container from the correlation corresponding to the container and the type of liquid; and an output unit that outputs the calculation result. 5. A suction unit drives a pipette for sucking a liquid, a suction pump connected to the pipette, a pipette moving unit that inserts the pipette into a container and vertically moves the suction pump, and the pipette moving unit. A control unit is provided, and the control unit has a calculation unit that calculates a pipette movement amount corresponding to a desired suction amount from a correlation corresponding to a container and a liquid type,
The liquid suction device according to claim 4, wherein the pipette is lowered by the calculated movement amount to drive the suction pump. 6. The liquid suction device according to claim 5, wherein the pipette moving unit includes a stepping motor for raising and lowering the pipette, and the raising and lowering distance of the pipette is determined by the number of drive pulses of the stepping motor.