US20160252388A1 - Mass comparator with removable climate module - Google Patents
Mass comparator with removable climate module Download PDFInfo
- Publication number
- US20160252388A1 US20160252388A1 US15/149,922 US201615149922A US2016252388A1 US 20160252388 A1 US20160252388 A1 US 20160252388A1 US 201615149922 A US201615149922 A US 201615149922A US 2016252388 A1 US2016252388 A1 US 2016252388A1
- Authority
- US
- United States
- Prior art keywords
- climate module
- air
- weighing chamber
- processor
- mass comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G17/00—Apparatus for or methods of weighing material of special form or property
- G01G17/04—Apparatus for or methods of weighing material of special form or property for weighing fluids, e.g. gases, pastes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/22—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them
- G01G19/24—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them using a single weighing apparatus
- G01G19/30—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them using a single weighing apparatus having electrical weight-sensitive devices
- G01G19/303—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them using a single weighing apparatus having electrical weight-sensitive devices involving digital counting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/22—Weigh pans or other weighing receptacles; Weighing platforms
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/28—Frames, Housings
- G01G21/286—Frames, Housings with windshields
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/48—Temperature-compensating arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
Definitions
- the invention relates to a mass comparator and a method for operating a mass comparator comprising a weighing chamber, which is separated from the surrounding area by a draft shield.
- the invention relates to a climate module of such a mass comparator.
- Electronic mass comparators which relate to the present invention, work with a comparison measurement.
- a known mass is compared, as a reference object, with the mass of a test sample in several weighing steps.
- Such test samples are, in particular, the reference masses for other balances.
- OIML International Organization on Legal Metrology
- temperature, the air pressure and the humidity also affect the balance itself, in particular, the load cell.
- correction factors are stored in the device, for example, in the form of curves or tables.
- temperature and air humidity sensors are disposed, in particular, in the area of the load cell. Then these temperature and air humidity sensors are used to automatically correct the balance itself, as a function of the changing ambient conditions, also called climate changes.
- German patent DE 37 14 540 C2 describes a method for automatically calibrating a high resolution electronic balance, wherein such environmental factors as the temperature change and the humidity change, both of which are detected from the outside, are used in order to calibrate the balance itself.
- the corresponding calibration factor is determined by a computer and corrects the weighing result.
- the German patent DE 299 12 867 U1 discloses an analytical balance with a measuring sensor for ambient parameters.
- the analytical balance has a display that is provided on the rear wall of the weighing chamber.
- the display shows the temperature in the weighing chamber and the air humidity in the weighing chamber as well as in general the air pressure that is usually present.
- the surface of the sample to be weighed will be covered with moisture, which is a function of the variances in the air humidity. Therefore, the operator is informed by the display that, for example, with changing air humidity, the sample to be weighed should remain in the weighing chamber longer, in order to obtain a stable end value of the surface moisture.
- the operator can perform a so-called buoyancy correction by feeding the displayed data to a processor in the balance by via of an input unit.
- this temperature is used to determine the deviation from the reference temperature and to consider corresponding correction factors.
- climate data of the measuring chamber are entered.
- the climate data from the climate module or the sensors thereof are fed manually or automatically into the balance.
- An object of the present invention is to provide a mass comparator that is compact and that ensures an improved measuring accuracy with less complexity.
- a mass comparator comprising a weighing chamber; a draft shield, which surrounds the weighing chamber; a climate module, which includes an air pressure sensor, an air humidity sensor and an air temperature sensor and which is disposed in the weighing chamber in such a way that it can be removed; a processor; a data input unit; and a data transmission path, over which data can be exchanged between the climate module and the processor.
- the object is achieved with a climate module configured to electrically couple to a mass comparator in a detachable manner, wherein the climate module forms a self-contained modular unit and comprises an air pressure sensor, an air humidity sensor and an air temperature sensor, as well as a data transmission path, over which data can be sent to a processor external to the climate module.
- the invention makes use of the idea of combining all of the components and functions, which are necessary for compensating for the climate changes in the weighing values, in the mass comparator. Therefore, no external computers, sensors, etc. are necessary. Instead, the user can be provided with a compact measurement laboratory, which can be designed in such a way that it is even portable. Since the climate module is interchangeable (i.e., can be detached from the balance without destroying it), it can be sent, if desired, to an external institute or service provider for calibration. In the meantime the mass comparator can still be used by installing a replacement climate module. As a result, it is possible to have on a rolling basis one or (in the case of several mass comparators) a plurality of climate modules being calibrated, while measuring with the other climate modules.
- the climate module offers an additional advantage that older balances can be retrofitted.
- the only requirement for such a retrofitting is, in addition to the data transmission path, the software of the processor.
- the mass comparator of the invention has the advantage that the climate data are measured behind the draft shield (and not just in the chamber, in which the balance is located). Therefore, precisely the air density that is relevant to the buoyancy is determined.
- the buoyancy values are transmitted automatically to the processor, transmission errors can be virtually eliminated. According to the German patent DE 299 12 867 U1, such transmission errors are possible, for example, when transferring values from the so-called calibration certificate into the calibration software.
- the climate module is connected to the processor via an electrical plug-in connection.
- the plug-in connection can be integrated into a mechanical receptacle, which is used to attach the climate module to the precision balance. In this way the data transmission path to the processor is automatically established, when the climate module is installed inside the draft shield.
- the climate module is coupled to the processor over a wireless transmission.
- the climate module can be disposed at any location inside the draft shield, for example, on a partition wall, where it will interfere the least, without having to take into consideration whether a plug-in connection can be arranged at this location in such a way that it is useful.
- the absence of a plug-in connection has the advantageous effect that the interior of the weighing compartment can be designed to be smoother and, therefore, easier to clean.
- the climate module includes an air pressure sensor, an air humidity sensor and an air temperature sensor. These sensors can be used to record the climate data that are essential for a precise measurement.
- a sensor for determining the degree of ionization in the weighing chamber there is a sensor for determining the degree of ionization in the weighing chamber; and this sensor is coupled to the data transmission path.
- the processor generates, as a function of a certain degree of ionization, an output signal, for example, to actively change the degree of ionization, by using an ionization device, which is activated after reaching certain degrees of ionization.
- a display can also indicate to the user that the degree of ionization inside the weighing chamber is too high and should be discharged.
- the climate module has a light sensor, which is coupled to the processor.
- the processor can output an output signal following a specified level of incident light. As a result, it is possible to determine the effect of the incident light on the weighing process, so that appropriate steps can be taken in the process itself.
- the output signal can also be an indicator.
- the processor is designed such that it uses the air pressure, the air humidity and the air temperature in the weighing chamber to determine, based on the density of the sample to be weighed, the air buoyancy of at least one test sample as well as to determine the buoyancy correction factor.
- This arrangement makes it possible to receive from the climate module the metrologically traceable values at the same time as the transfer of the mass value, with which the processor is able to correct the weighing result.
- an electronic memory in particular, an EEPROM, which can be read out by an external reader and in which the calibration values and the correction values for the climate module can be stored, is provided inside the climate module.
- the calibration values can be stored in an electronic memory on the climate module, in particular, can be stored in an EEPROM. This is done at an external service provider. If the climate module is then reconnected to the mass comparator, these data are then immediately available to the processor of the balance.
- the memory can be used to store, among other things, at least some of the following sensor calibration data, for example: the number of the calibration certificate, the current calibration values, the calibration date, the name of the calibration laboratory, the name of the person in charge and the calibration history.
- so-called uncertainty values can also be stored for each climate variable in the memory of the climate module, so that, for example, in order to compute the air density, the computation of the uncertainty of the air density can also be performed by the mass comparator.
- the climate module can also be used as a stand-alone unit external to a balance and can be connected to a USB port of a PC via an I 2 C bus. This arrangement makes it easier to perform an external calibration.
- the climate module can be used in other applications to record climate variables without having to be connected to a balance.
- the printed circuit board of the climate module can easily have a plug-in extension, in order to be connected to a USB adapter.
- the object is achieved with a method for operating a mass comparator comprising a weighing chamber, which is separated from the surrounding area by a draft shield and in which an air pressure sensor, an air humidity sensor and an air temperature sensor are arranged, wherein the sensors are coupled to a processor and wherein the sample to be weighed is weighed in the form of a test sample and at least one reference weight.
- the air pressure, the air humidity and the air temperature in the weighing chamber are determined by the sensors.
- the density of the sample to be weighed, the mass of which sample is to be determined is entered into the mass comparator.
- the air buoyancy of at least the test sample as well as the buoyancy correction factor are determined from the air pressure, the air humidity, the air temperature and the density of the sample to be weighed. Finally the corrected, conventional weighing value of the test sample is determined.
- the inventive method determines the current air density during the weighing process from a number of parameters in the weighing chamber and not only, as proposed in DE 299 12 867 U1, with the air pressure.
- the actual current density and the density of the sample to be weighed are used to determine the air buoyancy of at least the test sample as well as to determine the buoyancy correction factor and, thus, the corrected conventional mass.
- all other data items are entered automatically. That is, neither the temperature, the air humidity, nor the air pressure is entered manually into the processor; the data flow electronically via the sensors into the processor.
- the measurement of the corresponding data to determine the buoyancy in the draft shield has the advantage that precisely the air density that is relevant to the buoyancy is determined.
- buoyancy values are transmitted automatically to the processor, it is possible to virtually eliminate transmission errors, which are possible, according to the German patent DE 299 12 867 U1, in the course of transferring the values from the so-called calibration certificate into the calibration software.
- the air buoyancy of the sample to be weighed is determined from the air pressure, the air humidity and the air temperature as well as the density of the reference weight, in order to determine the mass of the reference weight, where the mass is corrected by its air buoyancy.
- the degree of ionization in the weighing chamber is determined, and that the processor outputs an output signal, as a function of the degree of ionization that is determined. It can also be provided that a light sensor determines the level of incident light in the weighing chamber; and preferably that the processor outputs an output signal after a specified level of incident light.
- FIG. 1 an exploded view of a mass comparator, according to the invention
- FIG. 2 a perspective view of an inventive climate module, which can be used in the mass comparator of the invention
- FIG. 3 a side view of the climate module from FIG. 2 without the outer housing
- FIG. 4 a plan view of the climate module from FIG. 2 , also without the outer housing, and
- FIG. 5 a flow chart showing the process of the invention.
- FIG. 1 shows a high resolution electronic mass comparator that in this exemplary embodiment permits mass comparisons to be performed for the accuracy classes E1-F2 in compliance with OIML R 111-1.
- the mass comparator comprises a load cell 14 with a base 12 , in which a weighing module 10 , which is not shown in more detail, is housed.
- the load cell 14 comprises a weighing chamber 16 , which is formed by a draft shield with adjustable side walls 18 , a front wall 20 and a rear wall 22 .
- the weighing chamber 16 is separated from the surrounding area by the draft shield.
- a weighing dish 24 is used to hold the sample to be weighed.
- An electronic evaluation system 26 which is designed as a separate part in this embodiment, is electronically coupled to the load cell 14 via a cable 28 .
- a display unit 30 which is coupled to the evaluation system 26 , is used both as a display and as a data input unit. While the electronic evaluation system 26 and the display 30 are embodied as components physically separated from the weighing module 10 in the illustrated embodiment, other embodiments can incorporate one or both of these components 26 and 30 into the weighing module 10 .
- the electronic evaluation system 26 houses, among other things, a processor 32 , which receives data from the load cell 14 .
- the weighing chamber 16 has a climate module 34 , which is designed as a structurally separate unit and which can be mechanically coupled to the rear wall 22 through a disconnectable plug-in connection (hence, is attached in a manner allowing the climate module to be disconnected without destroying it), and, in particular, preferably without the aid of a tool.
- a climate module 34 which is designed as a structurally separate unit and which can be mechanically coupled to the rear wall 22 through a disconnectable plug-in connection (hence, is attached in a manner allowing the climate module to be disconnected without destroying it), and, in particular, preferably without the aid of a tool.
- the rear wall 22 has two slots 36 , which are spaced apart from each other and in which flexible locking hooks 38 (see also FIG. 2 ) engage with the outer housing 40 of the climate module.
- FIGS. 2 to 4 show the climate module 34 in more detail.
- the outer housing 40 has a number of apertures 42 , through which the interior of the outer housing 40 changes over into the weighing chamber 16 and becomes a part of the weighing chamber 16 , so that the climate inside the weighing chamber 16 corresponds to the climate inside the outer housing 40 .
- the climate module 34 is electronically coupled via an electrical plug-in connection to a corresponding plug receptacle 44 in the rear wall 22 .
- the plug receptacle 44 is electrically connected to the processor 32 .
- a plug 46 with contacts 48 is plugged into the plug receptacle 44 on the climate module 34 .
- the plug 46 forms a module-sided part of the electrical plug-in connection.
- a wireless transmission such as WLAN or Bluetooth, can be used.
- the electrical plug-in connection (or the wireless transmission used as an alternative) forms a data transmission path, over which the data can be transferred from the climate module 34 to the processor 32 and, if desired, can be transferred back to the climate module.
- the plug 46 is preferably a section of a circuit board 50 , on which a plurality of sensors for detecting the climate in the weighing chamber 16 are disposed. Therefore, an air temperature sensor 52 , an air humidity sensor 54 , a light sensor 56 , which is arranged directly in the vicinity of an aperture 42 , and a sensor 58 for detecting the degree of ionization in the weighing chamber 16 are provided on the circuit board 50 , and an electronic memory 60 is also provided on the circuit board.
- An air pressure sensor 62 is mechanically and electrically coupled to the circuit board 50 with a bracket 64 .
- a plurality of the sensors can also be combined into combined sensors.
- a wall 66 closes the shell-like outer housing 40 , so that the narrow tongue-like section of the circuit board 50 that is located to the right of the wall 66 in FIG. 4 , can be inserted into the rear wall 22 and the plug receptacle 44 .
- Each sensor is coupled to the processor 32 via corresponding contacts 48 .
- the memory 60 is coupled to the processor 32 .
- the mass comparator operates according to the following method, which is explained with reference to FIG. 5 .
- the density of the sample to be weighed (test weight, also called the test sample B, and the reference weight A) is entered into the mass comparator, for example, using the display unit 30 , which is also used simultaneously as a data input unit by way of, for example, the touch screen.
- the density of the sample to be weighed can have already been stored.
- a sample to be weighed is placed on the weighing dish 24 , and, in particular, according to the specified process steps, for example, first the reference weight A, then twice the test sample B and finally again the reference weight A.
- These process steps relate to comparison weighing, which in step 104 results in the display of the difference of the balance.
- the air pressure, the air humidity and the air temperature can be determined in step 106 by the sensors 62 , 54 and 52 , respectively; and the corresponding data are then transmitted to the processor 32 .
- the air density is determined in the processor 32 (see step 108 ).
- the input densities of the reference weight A and the test sample B are used in the processor to determine the air buoyancy correction factor in step 110 and/or to determine the air buoyancy of the sample to be weighed, as a function of the air pressure, the air humidity, the air temperature as well as the density of the sample to be weighed; and in step 112 the conventional weighing result of the test sample B, i.e., the mass of the test sample B that is corrected by its air buoyancy, is determined and displayed as a protocol in the display unit 30 , where in this case the conventional mass 114 of the reference weight also enters into the determination of the conventional mass of the test sample.
- the calibration values and the correction values for the climate module 34 which had been input during the calibration of the climate module 34 , are stored in the memory 60 .
- This calibration is performed outside of the mass comparator. To this end the climate module 34 is simply unplugged from the weighing chamber 16 without having to disconnect a wire connection. Then the climate module 34 is sent to an appropriate calibration institute that stores the number of the calibration certificate, i.e., the new calibration values, the calibration date, the name of the calibration laboratory, the name of the person in charge and the calibration history in the memory 60 . These values are read out later by the application program, when the climate module 34 is once again in the mass comparator, and flow directly into the computation.
- the number of the calibration certificate i.e., the new calibration values, the calibration date, the name of the calibration laboratory, the name of the person in charge and the calibration history in the memory 60 .
- the processor sends an output signal as a function of the exposure to incident light.
- an ionization device is activated; and this ionization device ionizes the air in the weighing chamber and makes sure that the sample to be weighed is discharged, or a warning about an excessive charge of the sample to be weighed is sent.
- the memory 60 is preferably an EEPROM.
- connection between the climate module 34 and the rest of the mass comparator is implemented using an I 2 C bus.
- the climate module 34 can be connected to a computer via a USB adapter, into which the climate module is inserted, in order to calibrate the sensors 52 to 58 and 62 without having to connect the climate module 34 to the mass comparator.
- the climate module is designed so that it can also be used as a stand-alone unit outside a balance and can be connected to a USB port of a PC using an I 2 C bus.
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/235,501 US20190137325A1 (en) | 2013-11-08 | 2018-12-28 | Method for operating mass comparator with removable climate module |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013018767 | 2013-11-08 | ||
DE102013018767.2 | 2013-11-08 | ||
DE102014101565.7 | 2014-02-07 | ||
DE201410101565 DE102014101565A1 (de) | 2013-11-08 | 2014-02-07 | Komparatorwaage mit abnehmbarem Klimamodul |
PCT/EP2014/002855 WO2015067352A1 (fr) | 2013-11-08 | 2014-10-22 | Balance à comparateur comportant un module de climatisation amovible |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/002855 Continuation WO2015067352A1 (fr) | 2013-11-08 | 2014-10-22 | Balance à comparateur comportant un module de climatisation amovible |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/235,501 Division US20190137325A1 (en) | 2013-11-08 | 2018-12-28 | Method for operating mass comparator with removable climate module |
Publications (1)
Publication Number | Publication Date |
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US20160252388A1 true US20160252388A1 (en) | 2016-09-01 |
Family
ID=52991020
Family Applications (6)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/149,914 Abandoned US20170023400A1 (en) | 2013-11-08 | 2016-05-09 | Precision balance or mass comparator with module for detecting a measurement uncertainty |
US15/149,922 Abandoned US20160252388A1 (en) | 2013-11-08 | 2016-05-09 | Mass comparator with removable climate module |
US15/149,909 Active 2035-04-02 US10281319B2 (en) | 2013-11-08 | 2016-05-09 | Dosing device with integrated balance and climate module |
US15/149,926 Active 2035-08-14 US10393570B2 (en) | 2013-11-08 | 2016-05-09 | Precision scale having a removable climate module |
US15/149,919 Active 2035-06-19 US10197435B2 (en) | 2013-11-08 | 2016-05-09 | Balance for calibrating pipettes |
US16/235,501 Abandoned US20190137325A1 (en) | 2013-11-08 | 2018-12-28 | Method for operating mass comparator with removable climate module |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US15/149,914 Abandoned US20170023400A1 (en) | 2013-11-08 | 2016-05-09 | Precision balance or mass comparator with module for detecting a measurement uncertainty |
Family Applications After (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/149,909 Active 2035-04-02 US10281319B2 (en) | 2013-11-08 | 2016-05-09 | Dosing device with integrated balance and climate module |
US15/149,926 Active 2035-08-14 US10393570B2 (en) | 2013-11-08 | 2016-05-09 | Precision scale having a removable climate module |
US15/149,919 Active 2035-06-19 US10197435B2 (en) | 2013-11-08 | 2016-05-09 | Balance for calibrating pipettes |
US16/235,501 Abandoned US20190137325A1 (en) | 2013-11-08 | 2018-12-28 | Method for operating mass comparator with removable climate module |
Country Status (5)
Country | Link |
---|---|
US (6) | US20170023400A1 (fr) |
EP (5) | EP3066429B2 (fr) |
CN (9) | CN105705914A (fr) |
DE (5) | DE102014101561A1 (fr) |
WO (5) | WO2015067330A1 (fr) |
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US20170089754A1 (en) * | 2015-09-28 | 2017-03-30 | Tatsuno Corporation | Calibration device and calibration method |
US10393570B2 (en) * | 2013-11-08 | 2019-08-27 | Sartorius Lab Instruments Gmbh & Co. Kg | Precision scale having a removable climate module |
US20200292374A1 (en) * | 2019-03-11 | 2020-09-17 | Mettler-Toledo Gmbh | Method for the verification of pipettes |
EP4350306A1 (fr) | 2022-10-07 | 2024-04-10 | Mettler-Toledo GmbH | Système de pesage et procédé de détermination de la densité d'air et de la correction de la flottabilité de l'air lors du pesage |
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DE102017108884A1 (de) | 2017-04-26 | 2018-10-31 | Wilfried Santo | Dosiervorrichtung |
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