WO2015071956A1 - 正確なピペット吐出容量校正方法及び装置 - Google Patents
正確なピペット吐出容量校正方法及び装置 Download PDFInfo
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- WO2015071956A1 WO2015071956A1 PCT/JP2013/080544 JP2013080544W WO2015071956A1 WO 2015071956 A1 WO2015071956 A1 WO 2015071956A1 JP 2013080544 W JP2013080544 W JP 2013080544W WO 2015071956 A1 WO2015071956 A1 WO 2015071956A1
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- weight
- pipette
- liquid
- capacity
- piston
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
- B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
- B01L3/0237—Details of electronic control, e.g. relating to user interface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
- G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
- G01F11/022—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type of the gun type and actuated by fluid pressure or by a motor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
- G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
- G01F11/023—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type with provision for varying the stroke of the piston
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
- G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
- G01F11/025—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type with manually operated pistons
- G01F11/027—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type with manually operated pistons of the syringe type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F13/00—Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/0084—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume for measuring volume
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G1/00—Weighing apparatus involving the use of a counterweight or other counterbalancing mass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
- B01L2200/14—Process control and prevention of errors
- B01L2200/148—Specific details about calibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
- B01L2300/0627—Sensor or part of a sensor is integrated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/06—Auxiliary integrated devices, integrated components
- B01L2300/0627—Sensor or part of a sensor is integrated
- B01L2300/0645—Electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0832—Geometry, shape and general structure cylindrical, tube shaped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/02—Burettes; Pipettes
- B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
- B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
- B01L3/0227—Details of motor drive means
Definitions
- the present invention relates to a pipette that is a measuring device that sucks / discharges a set volume of liquid, and more particularly to a method for accurately calibrating the discharge capacity of a pipette and a pipette device therefor.
- a metering device called a pipette, which has a function of discharging a constant volume of liquid, captures the volume change due to the movement of the movable piston provided inside the pipette as a volume change of the air, Suction and discharge to the chip attached to the.
- compressible air is used as the medium, so that air resistance is received in the air circuit, piston operation, tip (tip total length, tip tip shape, etc.), physical properties of the liquid to be sucked (hydrophobic, Due to various influences such as hydrophilicity or hygroscopicity) or measurement environment (atmospheric pressure, temperature, humidity, etc.), an error occurs with respect to the set capacity. For this reason, it is necessary to calibrate the discharge capacity.
- Patent Document 1 in an electrically operated pipette (hereinafter referred to as an electric pipette), calibration data such as a tip used, a liquid to be measured, a measurement environment, etc. is stored for each measurement condition with a data memory.
- an electric pipette an electrically operated pipette
- calibration data such as a tip used, a liquid to be measured, a measurement environment, etc. is stored for each measurement condition with a data memory.
- JP 2010-227933 A (Claim 1, paragraph 0008, etc.)
- Patent Document 1 since the pipette of Patent Document 1 records various combinations of tip information, liquid information to be measured, and environmental information one by one, there are a number of patterns, which may make it difficult to select a pattern. In addition, there are cases where there is no pattern that matches the current measurement environment, and it may not be reasonable in the field where various measurement conditions are assumed.
- the present invention has been made on the basis of the problems of the prior art, and the object thereof is to provide a simple pipette discharge capacity calibration method capable of ensuring accurate volume discharge even under arbitrary weighing conditions, and It is to provide such a device.
- a cylinder communicating with a pipette tip mounted for sucking / discharging a set amount of liquid, and moving up and down in the cylinder
- a pipette that includes a piston, a driving means for moving the piston, and a control means for controlling the driving means, a pipette that performs actual weighing, a step of setting a capacity, and a target for the set capacity
- Determining the volume obtaining a ratio between the set capacity and the actual capacity, and calibrating the ratio so as to suck the amount accumulated on the set capacity. And wherein the Mukoto.
- a cylinder communicating with a pipette tip mounted to suck / discharge a set amount of liquid, a piston moving up and down in the cylinder, and moving the piston
- a pipette that actually measures using a pipette including a driving means for controlling the driving means, and a control means for controlling the driving means, and a step of setting the weight, and measuring the liquid to be weighed for the set weight
- a cylinder communicating with a pipette tip mounted to suck / discharge a set amount of liquid, a piston moving up and down in the cylinder, and moving the piston
- a pipette that actually measures using a pipette including a driving means that controls the driving means, and a step of setting and displaying the volume, and aiming at the set volume, the liquid to be weighed, The step of sucking into the tip to be weighed, the step of discharging the liquid sucked into the tip into a mass meter capable of measuring the weight, and the actual volume actually discharged from the pipette is determined from the measured weight. And calibrating the capacity display with the actual capacity as a true value.
- a cylinder communicating with a pipette tip mounted to suck / discharge a set amount of liquid, a piston moving up and down in the cylinder, and moving the piston
- a pipette that actually measures using a pipette including a driving means for controlling the driving means, and a control means for controlling the driving means, a step of setting and displaying the weight, and a liquid to be weighed for the set weight, The step of sucking into the tip to be weighed, the step of discharging the liquid sucked into the tip into a mass meter capable of measuring the weight, and the actual weight actually discharged from the pipette is determined from the measured weight. And calibrating the weight display with the actual weight as a true value.
- a cylinder communicating with a pipette tip mounted to suck / discharge a set amount of liquid, a piston that moves up and down in the cylinder, and a rotary drive motor that moves the piston
- a calculation processing unit for controlling and calculating the number of rotations of the motor, and a user interface unit having a display unit.
- the user interface unit has a capacity setting unit, and the calculation processing unit is set. Aiming at the capacity, the liquid to be weighed is sucked into the tip to be weighed, and the liquid sucked into the tip is actually discharged from the pipette from the measured weight obtained by discharging it to the mass meter that can measure the weight.
- the calculation means determines the ratio of the set capacity to the actual capacity and determines the ratio of the set capacity and the actual capacity to be sucked. Characterized in that it comprises means for the.
- a cylinder communicating with a pipette tip mounted to suck / discharge a set amount of liquid, a piston that moves up and down in the cylinder, and a rotary drive motor that moves the piston
- an arithmetic processing unit for controlling and calculating the number of rotations of the motor
- a user interface unit having a display unit.
- the user interface unit has a means for setting weight, and the arithmetic processing unit is set. Aiming at the weight, the liquid to be weighed is sucked into the tip to be weighed, and the liquid sucked into the tip is actually discharged from the pipette from the measured weight obtained by discharging it to the mass meter that can measure the weight.
- the means for determining the actual weight and the calculation processing unit obtain a ratio between the set weight and the actual weight, and suck the amount obtained by multiplying the ratio by the set weight. Characterized in that it comprises means for the.
- a cylinder communicating with a pipette tip mounted to suck / discharge a set amount of liquid, a piston that moves up and down in the cylinder, and a rotary drive motor that moves the piston
- an arithmetic processing unit for controlling and calculating the number of rotations of the motor
- a user interface unit including a display unit, the user interface unit is configured to set and display a capacity, and the arithmetic processing unit includes: Aiming at the set volume, the liquid to be weighed is sucked into the tip to be weighed, and the liquid sucked into the tip is actually discharged from the pipette from the measured weight obtained by discharging it to the mass meter that can measure the weight.
- a cylinder communicating with a pipette tip mounted to suck / discharge a set amount of liquid, a piston that moves up and down in the cylinder, and a rotary drive motor that moves the piston
- an arithmetic processing unit that controls and calculates the rotation speed of the motor
- a user interface unit that includes a display unit
- the user interface unit includes means for setting and displaying weight
- the arithmetic processing unit includes: Aiming at the set weight, the liquid to be weighed is sucked into the tip to be weighed, and the liquid sucked into the tip is actually discharged from the pipette from the measured weight obtained by discharging it to the mass meter that can measure the weight.
- the electric pipette according to the present invention is preferably characterized in that weight display means for displaying the discharge amount by weight on the display unit is provided.
- the electric pipette according to the present invention is preferably provided with unit switching means for selecting whether to display and discharge by weighing by volume or by weighing by weight during weighing.
- the liquid that is actually weighed is calibrated in the environment where it is actually weighed using the actually metering tip by the pipette actually used for weighing, the pipette tip, the liquid to be weighed, It eliminates errors due to environmental factors, etc., and can calibrate easily and accurately.
- the calibration step is to determine the pipette, tip, and liquid to be measured, and then aspirate and discharge the set amount under the measuring conditions to determine the actual discharge amount. Then, the mechanism is adjusted so that the value obtained by multiplying the set amount by the suction is sucked, and the actual discharge amount is calibrated to match the set amount. Alternatively, the actual discharge amount is input to the pipette, and the displayed amount is calibrated to the actually discharged amount.
- the management amount of the target set amount is set as the weight, it is possible to perform a simpler calibration that unifies the unit system.
- the weight measurement method that is a general calibration method, but the actual amount actually discharged from the pipette is confirmed by the weight of the mass meter. That is, the first physical quantity for volume management in pipette calibration is weight.
- the amount actually discharged is determined only by determining the density of the liquid to be weighed in order to convert the managed amount from weight to volume.
- the setting by weight in the first place it is not necessary to obtain the conversion process of this unit system, in particular, the density of the liquid to be measured, so that it becomes a simpler calibration method.
- FIG. 1 is a front view of an electric pipette showing an embodiment of the present invention
- FIG. 2 is a right side view of the electric pipette.
- Reference numeral 100 denotes an electric pipette, which is a micropipette that is operated by hand to have an overall length of about 280 mm.
- Reference numeral 1 denotes a cylindrical main body case 1 that is long in the vertical direction, and an elongated cylinder 2 for sucking and discharging liquid is formed inside the case defined by fitting the front case and the rear case, A piston 3 inserted in the cylinder 2 so as to be reciprocally movable in the vertical direction, a ball screw 5 connected to the piston 3 for moving the piston 3 in the vertical direction, and the ball screw 5 being driven to rotate in both forward and reverse directions.
- a stepping motor 6 to be operated.
- Reference numeral 7 denotes a chip holder, which is a part of the main body case 1 and is engaged with the lower portion of the main body case 1 in a detachable manner. At the time of assembly, the lower side of the cylinder 2 having a small diameter is accommodated. A pipette tip 8 (shown by a broken line) is attached to the lower end portion of the tip holder 7 so as to be detachably attached so as to be inserted through the lower end portion of the cylinder 2. A liquid to be weighed is sucked / discharged onto the chip 8.
- the chip 8 shown in the drawing is merely an example, and various lengths and shapes are distributed according to the set amount and the liquid type, and the user arbitrarily selects according to the purpose.
- a user interface unit 18 is provided in front of the electric pipette 100.
- the user interface unit 18 includes a liquid crystal panel (display unit) 18a and an operation key 18c, and is capable of setting a discharge volume parameter, setting an operation mode of the apparatus, and the like.
- a release switch 12 for removing the chip 8 is provided below the user interface unit 18.
- the release switch 12 is mechanically connected to the chip holder 7, and the chip 8 is pushed down and detached from the chip holder 7 by pressing the release switch 12 downward.
- an operation switch 14 for starting the operation is provided on the back of the electric pipette 100. Further, below the operation switch 14 is provided a finger rest 16 that serves as a support assist during operation and a stopper during non-operation.
- an electric board 10 is accommodated on the back surface of the user interface unit 18, and a storage battery 11 for driving the electric board 10 and the motor 6 is accommodated above the motor 6.
- the left and right side surfaces of the electric pipette 100 are provided with projecting charge points 17 that are electrically connected to the storage battery 11 in order to be electrically connected to an external charging device that charges the storage battery 11.
- the electric pipette 100 has two energy supply lines, and in addition to the storage battery 11 described above, the power supply 15 provided on the right side surface of the electric pipette 100 is powered by the commercial power supply 152 via the AC adapter 151. Can do.
- FIG. 3 is a block diagram of the electric pipette.
- Reference numeral 20 denotes an arithmetic processing unit serving as a control core, which is connected to the user interface unit 18.
- the arithmetic processing unit 20 is operated by the operation key 18c, outputs a signal to the display unit 18a and the acoustic signal buzzer 18b, and displays the setting / control contents and the calculation result (with buzzer sound as appropriate) on the screen.
- Reference numeral 4 denotes a driver for controlling the stepping motor 6
- reference numeral 9 denotes a piston position detection sensor
- the arithmetic processing unit 20 detects a position (zero point) of the piston 3 by obtaining a signal from the piston position detection sensor 9. Then, the motor rotation speed necessary to move the piston 3 with the target movement amount is input to the driver 4.
- the motor 4 rotates under the control of the driver 4, the piston 3 in the cylinder 2 moves up and down via the ball screw mechanism 5, and the inside of the cylinder 2 is negatively pressurized. The liquid to be weighed is sucked and discharged by the tip 8.
- Numeral 21 is a non-volatile data memory
- numeral 22 is an external communication port
- the arithmetic processing unit 20 outputs or reads the setting / control contents and the arithmetic result to the data memory 21.
- the arithmetic processing unit 20 can communicate data with an external PC or the like via the external communication port 22.
- the calibration method of the present invention using this electric pipette 100 will be described.
- One of the features of any of the following calibration methods is that the electric pipette 100 that is actually used for measurement is performed in an environment in which the liquid to be actually measured is actually measured using the tip 8 that is actually measured.
- FIG. 4 is a flowchart showing a first calibration method using the electric pipette.
- the electric pipette 100 that is actually used for weighing and the tip 8 that is actually weighed are selected in the environment where the metering is actually performed, and the liquid to be actually metered is prepared.
- step S1 the process proceeds to step S1, and the set volume parameter V0 [unit: L / mL / ⁇ L], which is the target volume, is selected or input from the operation key 18c and set.
- the selected value or input value is displayed on the display unit 18a.
- step S2 the process proceeds to step S2, and the operation switch 14 is pressed to suck the liquid into the chip 8.
- the operation switch 14 is pressed and discharged to the mass meter capable of measuring the weight.
- the resolution of the mass meter should be selected according to the set capacity. For example, in a pipette test with a set volume of 20 ⁇ L, it is required to confirm to the order of 0.1 ⁇ L, so it is necessary to measure 10 nL, which is one digit lower, and a semi-micro balance is required as a mass meter. Become.
- step S4 the process proceeds to step S4, and the measured weight G [unit: g / mg / ⁇ g] is measured with a mass meter.
- step S5 the obtained measured weight G is converted into a unit.
- Conversion to the volume uses at least the density of the liquid to be weighed. This may be obtained by simply dividing the measured weight by the density of the liquid to be weighed in advance by a density meter or the like, but preferably a conversion factor using the change in density of liquid and buoyancy due to temperature and atmospheric pressure as parameters. It is better to use.
- the calculation may use a program in another calculation device such as an external PC.
- step S6 the display unit 18a issues a message to input the actual volume V of the liquid to be weighed.
- the user inputs the actual volume V obtained in step S5 from the operation key 18c, and determines the actual volume V [L / mL / ⁇ L].
- step S8 the arithmetic processing unit 20 obtains the corrected movement rate k1 of the piston 3 from the equation (1).
- k1 k0 ⁇ ⁇ 1 (1)
- k0 is the initial movement rate of the piston corresponding to the set capacity V0.
- step S9 the arithmetic processing unit 20 outputs the corrected movement rate k1 of the piston to the data memory 21, and the data memory 21 stores the corrected movement rate k1. This completes the calibration.
- the actual discharge capacity can be accurately discharged by an arbitrary set capacity.
- the arithmetic processing unit 20 reads the corrected movement rate k1 obtained by calibration from the memory 21 and calculates the piston 3 from the equation (2).
- the mechanism is adjusted so as to suck [ ⁇ L], and the actual discharge amount becomes 100 [ ⁇ L].
- the mechanism is adjusted so as to suck the correction volume v ′ taking into account the error with respect to an arbitrary set volume v using the piston correction movement rate k1 obtained by calibration.
- the actual discharge volume is discharged by the set volume v.
- FIG. 5 is a flowchart showing a second calibration method using the electric pipette.
- the unit system of the target set amount is unified with respect to the weight with respect to the first calibration method, and calibration is performed more easily.
- the same step numbers are cited and the description is omitted.
- Step S21 corresponds to step S1 of the first calibration method.
- the difference is that the target set amount is by weight. That is, in step S21, the set weight G0 [unit: g / mg / ⁇ g] is selected or input and set.
- the process proceeds to steps S22, S23, and S24, and is sucked into the chip 8 and discharged to the mass meter, similarly to steps S2, S3, and S4. Then, the measurement weight G [unit: g / mg / ⁇ g] of the mass meter is measured and input, and the actual weight G is determined. In the second calibration method, the unit system is unified by weight, and the measured weight G is the actual weight G, so steps S5 and S6 are unnecessary.
- step S25 corresponds to step S7.
- step S26 the arithmetic processing unit 20 obtains the corrected movement rate k2 of the piston 3 from the equation (3).
- k2 k0 ⁇ ⁇ 2 (3)
- k0 is the initial moving rate of the piston corresponding to the set weight G0.
- step S27 the arithmetic processing unit 20 outputs the corrected movement rate k2 of the piston to the data memory 21, and the data memory 21 stores the corrected movement rate k2. This completes the calibration.
- the arithmetic processing unit 20 reads the corrected movement rate k2 obtained by the calibration from the memory 21.
- FIG. 6 is a flowchart showing a third calibration method with the electric pipette.
- the third calibration method calibrates the display amount
- the first calibration method calibrates the suction amount.
- the same step numbers are cited and the description is omitted.
- Steps S31 to S36 are the same as steps S1 to S6.
- step S37 the arithmetic processing unit 20 changes the set capacity V0 displayed on the display unit 18a to the actual capacity V obtained in step S36.
- step S38 information related to the current calibration is stored in the data memory 21. This completes the calibration.
- FIG. 7 is a flowchart showing a fourth calibration method using the electric pipette.
- the unit system of the target set amount is unified with respect to the weight with respect to the third calibration method.
- the same step numbers are cited and the description is omitted.
- Step S41 corresponds to step S31 of the third calibration method, but the target set amount is selected or input with the set weight G0 [unit: g / mg / ⁇ g].
- step S42, S43, 424 it progresses to step S42, S43, 424, and is attracted
- the measured weight G [unit: g / mg / microgram] of a mass meter Get.
- steps S35 and S36 are unnecessary.
- step S45 the arithmetic processing unit 20 changes the set weight G0 displayed on the display unit 18a to the actual weight G obtained in step S36.
- step S46 information related to the current calibration is stored in the data memory 21. This completes the calibration.
- the motor rotation speed is changed, the suction is taken into account with an error, and the actual discharge amount is set.
- the third and fourth calibration methods it is possible to guide the actual discharge amount to the set amount by adjusting the display to the actual discharge amount (display calibration) without changing the motor rotation speed. it can.
- any of the first to fourth calibration methods is a method of calibrating a liquid to be actually measured with a pipette actually used for measurement in an environment for actually measuring using a tip for actually measuring, the pipette Errors due to the chip, liquid to be measured, environmental factors, etc. can be eliminated, and calibration can be performed easily and accurately.
- the management amount of the target set amount as the weight, it is not necessary to obtain the unit system conversion step, particularly the density of the liquid to be measured, so that It becomes a simple calibration method.
- a manual pipette also has a cylinder communicating with a pipette tip mounted to suck / discharge a set amount of liquid, a piston that moves up and down in the cylinder, a drive means (screw mechanism) that moves the piston, and a drive And a control means (adjustment knob) for engaging and controlling the means. That is, if the adjustment knob is manually turned to suck the correction volume v or the correction weight g, the calibration method of the present application can be executed.
- the stroke adjustment of the piston 3 with respect to the set amount at the time of measurement only needs to input and control the numerical value of the number of rotations of the motor 6, so manual adjustment In comparison, it becomes very simple.
- the measured weight G obtained in step S24 or S44 in the second and fourth calibration methods is connected from the mass meter via the external communication port 22 by connecting, for example, with an RS-232C cable, regardless of input. It can also be obtained directly.
- the unit conversion result obtained in step S5 or S35 in the first and third calibration methods can be directly obtained from an external computing device (such as a PC) via the external communication port 22, regardless of input. Is possible.
- the liquid to be weighed is sucked more than the set volume, and the excess volume is not used for weighing so that the set volume is discharged accurately. Even when weighing is performed by the method, it can be used in the same manner.
- the electric pipette 100 is provided with weight display means (weight display function) in the arithmetic processing unit 20 for displaying the discharge (dispensing) amount by weight on the display unit 18a not only during calibration but also during weighing. Keep it clear.
- weight display means weight display function
- the electric pipette 100 is provided with unit switching means (unit switching function) that allows the user to arbitrarily select the management amount at the time of measurement. That is, if the user interface unit 18 selects which one to perform, the arithmetic processing unit 20 displays and discharges (dispenses) the metered volume, or displays and discharges (dispenses) the metered weight. Is selectively executed.
- unit switching means unit switching function
- pipettes are being deployed as liquid management tools in bio-related, pharmaceutical, food or cosmetics, clinical trial industrial products, environmental measurements, etc.
- liquids are diluted by weight ratio, and a solution is prepared by mixing a solvent (for example, mL) measured with a pipette and a solute (for example, mg) measured with a mass meter.
- a solvent for example, mL
- a solute for example, mg
- the formulation is managed.
- a conventional general pipette has only a capacity display (display in units of L) function, the unit system is different, and thus the distribution of the mixture frequently occurs. Further, as described above, it is necessary to know the density of the liquid to be weighed in order to convert the management amount.
- the electric pipette 100 of the present application is provided with a function that allows the user to arbitrarily switch the management unit and perform measurement by omitting these troublesome correspondences.
- FIG. 1 Front view of an electric pipette according to the present invention
- FIG. 1 Right side view of the electric pipette Block diagram of the electric pipette Flow chart showing the first calibration method with the same electric pipette Flow chart showing the second calibration method with the same electric pipette Flow chart showing the third calibration method with the same electric pipette Flow chart showing the fourth calibration method with the same electric pipette
Abstract
Description
図4は、同電動ピペットでの第1の校正方法を示すフロー図である。
事前ステップS0として、実際に計量する環境において、実際に計量に用いる電動ピペット100と、実際に計量するチップ8を選択し、実際に計量する液体を準備する。
k1=k0×κ1 ・・・(1)
ただし、k0は設定した容量V0に対応するピストンの初期移動率
d1=k1×v ・・・(2)
図5は、同電動ピペットでの第2の校正方法を示すフロー図である。第2の校正方法は、第1の校正方法に対して、目標とする設定量の単位系を、重量に統一し、いっそう簡易に校正を行うものである。第1の校正方法と同じ工程に対しては、同一のステップ番号を引用して説明を割愛する。
k2=k0×κ2 ・・・(3)
ただし、k0は設定した重量G0に対応するピストンの初期移動率
d2=k2×g ・・・(4)
図6は、同電動ピペットでの第3の校正方法を示すフロー図である。第3の校正方法は、第1の校正方法が、吸引量を校正したのに対して、表示量を校正するものである。第1の校正方法と同じ工程に対しては、同一のステップ番号を引用して説明を割愛する。
図7は、同電動ピペットでの第4の校正方法を示すフロー図である。第4の校正方法は、第3の校正方法に対して、目標とする設定量の単位系を、重量に統一したものである。第3の校正方法と同じ工程に対しては、同一のステップ番号を引用して説明を割愛する。
2 シリンダ
3 ピストン
4 ドライバ
5 ボールネジ
6 モータ
7 チップホルダー
8 チップ
9 ピストン位置検出センサ
10 電気ボード
11 畜電池
12 リリーススイッチ
14 操作スイッチ
15 電源コネクタ
151 ACアダプタ
152 商用電源
16 フィンガーレスト
17 チャージポイント
18 ユーザインターフェース部
18a 液晶パネル
18b ブザー
18c 操作キー
20 演算処理部
21 メモリ
22 外部通信ポート
100 電動ピペット
Claims (10)
- 設定した量の液体を吸引/吐出するために装着されるピペット用チップと連通するシリンダと、シリンダ内を上下動するピストンと、ピストンを移動させる駆動手段と、駆動手段を制御する制御手段と、を含むピペットを用いて、
実際に計量を行うピペットで、容量を設定するステップと、
設定した容量を目指して、被計量液体を、計量を行うチップに吸引するステップと、
チップに吸引した液体を、重量を測定することができる質量計に対し吐出するステップと、
測定重量から、ピペットから実際に吐出された実際の容量を確定するステップと、
設定した容量と実際の容量の比を求め、この比を設定した容量に積した量を吸引するよう校正するステップと、
を含むことを特徴とする、ピペットの吐出容量校正方法。 - 設定した量の液体を吸引/吐出するために装着されるピペット用チップと連通するシリンダと、シリンダ内を上下動するピストンと、ピストンを移動させる駆動手段と、駆動手段を制御する制御手段と、を含むピペットを用いて、
実際に計量を行うピペットで、重量を設定するステップと、
設定した重量を目指して、被計量液体を、計量を行うチップに吸引するステップと、
チップに吸引した液体を、重量を測定することができる質量計に対し吐出するステップと、
測定重量から、ピペットから実際に吐出された実際の重量を確定するステップと、
設定した重量と実際の重量の比を求め、この比を設定した重量に積した量を吸引するよう校正するステップと、
を含むことを特徴とする、ピペットの吐出容量校正方法。 - 設定した量の液体を吸引/吐出するために装着されるピペット用チップと連通するシリンダと、シリンダ内を上下動するピストンと、ピストンを移動させる駆動手段と、駆動手段を制御する制御手段と、を含むピペットを用いて、
実際に計量を行うピペットで容量を設定し表示するステップと、
設定した容量を目指して、被計量液体を、計量を行うチップに吸引するステップと、
チップに吸引した液体を、重量を測定することができる質量計に対し吐出するステップと、
測定重量から、ピペットから実際に吐出された実際の容量を確定するステップと、
実際の容量を真値として容量表示を校正するステップと、
を含むことを特徴とする、ピペットの吐出容量校正方法。 - 設定した量の液体を吸引/吐出するために装着されるピペット用チップと連通するシリンダと、シリンダ内を上下動するピストンと、ピストンを移動させる駆動手段と、駆動手段を制御する制御手段と、を含むピペットを用いて、
実際に計量を行うピペットで重量を設定し表示するステップと、
設定した重量を目指して、被計量液体を、計量を行うチップに吸引するステップと、
チップに吸引した液体を、重量を測定することができる質量計に対し吐出するステップと、
測定重量から、ピペットから実際に吐出された実際の重量を確定するステップと、
実際の重量を真値として重量表示を校正するステップと、
を含むことを特徴とする、ピペットの吐出容量校正方法。 - 設定した量の液体を吸引/吐出するために装着されるピペット用チップと連通するシリンダと、シリンダ内を上下動するピストンと、ピストンを移動させる回転駆動モータと、モータの回転数の制御や演算を行う演算処理部と、表示部を備えるユーザインターフェース部と、を含み、
ユーザインターフェース部には、容量を設定する手段と、
演算処理部には、設定した容量を目指して、被計量液体を、計量を行うチップに吸引し、チップに吸引した液体を、重量を測定することができる質量計に対し吐出して得た測定重量から、ピペットから実際に吐出された実際の容量を確定する手段と、
演算処理部には、設定した容量と実際の容量の比を求め、この比を設定した容量に積した量を吸引するよう校正する手段と、
を備えることを特徴とする、電動ピペット。 - 設定した量の液体を吸引/吐出するために装着されるピペット用チップと連通するシリンダと、シリンダ内を上下動するピストンと、ピストンを移動させる回転駆動モータと、モータの回転数の制御や演算を行う演算処理部と、表示部を備えるユーザインターフェース部と、を含み、
ユーザインターフェース部には、重量を設定する手段と、
演算処理部には、設定した重量を目指して、被計量液体を、計量を行うチップに吸引し、チップに吸引した液体を、重量を測定することができる質量計に対し吐出して得た測定重量から、ピペットから実際に吐出された実際の重量を確定する手段と、
演算処理部には、設定した重量と実際の重量の比を求め、この比を設定した重量に積した量を吸引するよう校正する手段と、
を備えることを特徴とする、電動ピペット。 - 設定した量の液体を吸引/吐出するために装着されるピペット用チップと連通するシリンダと、シリンダ内を上下動するピストンと、ピストンを移動させる回転駆動モータと、モータの回転数の制御及び演算を行う演算処理部と、表示部を備えるユーザインターフェース部と、を含み、
ユーザインターフェース部には、容量を設定し表示する手段と、
演算処理部には、設定した容量を目指して、被計量液体を、計量を行うチップに吸引し、チップに吸引した液体を、重量を測定することができる質量計に対し吐出して得た測定重量から、ピペットから実際に吐出された実際の容量を確定する手段と、
実際の容量を真値として容量表示を校正する手段と、
を備えることを特徴とする、電動ピペット。 - 設定した量の液体を吸引/吐出するために装着されるピペット用チップと連通するシリンダと、シリンダ内を上下動するピストンと、ピストンを移動させる回転駆動モータと、モータの回転数の制御及び演算を行う演算処理部と、表示部を備えるユーザインターフェース部と、を含み、
ユーザインターフェース部には、重量を設定し表示する手段と、
演算処理部には、設定した重量を目指して、被計量液体を、計量を行うチップに吸引し、チップに吸引した液体を、重量を測定することができる質量計に対し吐出して得た測定重量から、ピペットから実際に吐出された実際の重量を確定する手段と、
実際の重量を真値として重量表示を校正する手段と、
を備えることを特徴とする、電動ピペット。 - 前記電動ピペットには、表示部に重量で吐出量を表示させる重量表示手段が設けられていることを特徴とする請求項5~8のいずれかに記載の電動ピペット。
- 前記電動ピペットには、計量時、容量による計量で表示し吐出するか、重量による計量で表示し吐出するか、を選択する単位切替手段が設けられていることを特徴とする請求項5~9のいずれかに記載の電動ピペット。
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JP2015547304A JP6173480B2 (ja) | 2013-11-12 | 2013-11-12 | 正確なピペット吐出容量校正方法及び装置 |
CN201380077686.8A CN105324175B (zh) | 2013-11-12 | 2013-11-12 | 正确的吸液管排出容量校正方法及装置 |
EP13897322.7A EP3069790A4 (en) | 2013-11-12 | 2013-11-12 | Method and device for accurate pipette discharge volume calibration |
US15/024,867 US20160236189A1 (en) | 2013-11-12 | 2013-11-12 | Method for accurately calibrating discharge volume of pipette, and apparatus therefor |
TW103126749A TWI533930B (zh) | 2013-11-12 | 2014-08-05 | Correct pipette discharge capacity correction method and device |
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JPWO2015071956A1 (ja) | 2017-03-09 |
TW201519952A (zh) | 2015-06-01 |
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