JPH02136731A - Electronic balance - Google Patents

Abstract

PURPOSE:To quickly execute the measurement of mass and the weighing work related to a target substance by inputting a chemical composition of an existing sample and a chemical composition of the target substance, in a mass analysis electronic balance. CONSTITUTION:The electronic balance is provided with a load detecting part (a) for outputting an electric signal D corresponding to a load on a tray, and a mass calculating means (b) for calculating mass W of a sample placed on a tray, based on the output D from its detecting part (a). In this state, by a storage means (c), each atomic weight of plural elements is stored, and a composition input means (d) inputs information related to a chemical composition (a first chemical composition) of a sample to be placed on a tray, and information related to a chemical composition (a second chemical composition) of a target compound which contains in its composition a notice component contained in its sample or its sample. Subsequently, by using the contents of the means (c), a ratio (p) of molecular weight of a second chemical composition against a first chemical composition which is inputted is calculated by a ratio calculating means (e). Next, the mass value W calculated by the means (b) is converted to a mass value (w) of a substance of a second chemical composition by using this radio (p), and displayed on an indicator (g).

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an electronic balance, and in particular, it is used to calculate the mass of a component of interest in a sample compound, or the mass of a compound obtained by combining an existing sample with another substance. Regarding electronic balances suitable for estimation.

<Prior art> In electronic balances or electronic scales, except for special scales such as counting scales and charge conversion scales that display units that are completely different from mass or weight, the mass or weight loaded on the pan is It is common to display the weight itself, or to display the amount obtained by subtracting the tare weight from the mass on the plate.

<Problem to be solved by the invention> By the way, in fields such as chemistry, there are cases in which one focuses on a specific component in a sample compound and wants to know the mass of that component, or when the sample is obtained by combining with other substances. Sometimes we want to know the mass of a compound.

When performing such measurement work using a conventional general electronic balance, as a specific example of the former, for example, a compound AXB consisting of components A and B is used as a sample, and in order to find the mass of component A of the sample. To do this, it is first necessary to measure the quality iQ of the sample compound using an electronic balance, then examine the atoms ffi w A and WB of components A and B, respectively, and calculate the mass QA of component A using the following calculation. be.

As a specific example of the latter, when compounds A and B are obtained by combining sample A with another substance B, in order to find the mass of the compound after combination from the mass of the sample, first, electron It is necessary to measure the mass QA of sample A with a balance, and then similarly use the atomic masses WA and Wll of A and B to estimate the quality iQ of compounds A and By by calculation.

Furthermore, when measuring a certain amount in fields such as chemistry, it is necessary to measure only a certain mass of a component of interest in a sample compound, or to obtain a certain amount of a certain compound, the components of that compound before being combined are weighed. There is also the task of measuring only the appropriate amount.

When performing such weighing work with a conventional electronic balance, examples of the former include compounds A and B.

In order to measure only the mass Q- of component A as a sample, first find out the atomic weights WA and w of components A and B, and calculate Q'A by calculating the weighed amount Q' of the sample compound. Then, it is necessary to place the sample compound on the plate so that the value displayed on the electronic balance matches Q'.

In addition, as an example of the latter weighing operation, compound A,
B,) To measure the corresponding mass of component A before combination in order to obtain f-mass Q', first, measure A in the same way.
and atoms of B it W After calculating the amount Q% of the sample of component A by calculating from A and W8, the amount Q'
It is necessary to weigh the sample only for A using an electronic balance.

As mentioned above, in this type of mass measurement and weighing work, it is necessary to know the atomic weight of each element and perform the specified calculations before or after using an electronic balance, which makes the work complicated. was.

Means for Solving the Problems> The present invention has been made in view of the above points, and attempts to solve the above problems with the configuration shown in the basic conceptual diagram of FIG. 1 or 2. It is.

The basic configuration shown in Figure 1 is a configuration that can be applied to both the mass measurement and weighing work described above, and the basic configuration shown in Figure 2 is a configuration aimed at solving problems in weighing work. It is.

The invention shown in FIG. 1 includes a load detection part a that outputs an electrical signal corresponding to the load on the dish, and a quality 1w of the sample on the dish based on the output from the load detection part a. A balance equipped with a mass calculation means is characterized by having the following (-w g.

C: Storage means for storing each atomic weight of a plurality of elements.

d; Information on the chemical composition of the sample to be placed on the plate (first chemical composition) and the chemical composition of the component of interest contained in the sample or the target compound containing the sample in the composition (second chemical composition);
composition input means for inputting information regarding the chemical composition of

e; Molecular weight (or atomic weight) of the second chemical composition relative to the input first chemical composition using the contents of the storage means C;
Ratio calculation means for calculating the ratio p.

f; Mass conversion means for converting the mass value W calculated by the mass calculation means 1 into the mass value W of the substance having the second chemical composition using the ratio p calculated by the ratio calculation means e.

g; Display device that displays the converted mass value W.

Moreover, the invention shown in FIG.
and f! In a balance equipped with a calculation means, the following c and d
, e and hk.

C: Storage means similar to the invention shown in FIG.

d; Composition input means e similar to the invention in FIG. 1; Ratio calculation means h similar to the invention in FIG. 1; Mass calculation means 1 indicator.

i; Target amount input means for inputting a weighed target amount (ff amount) Wo of a component of interest contained in a sample or a target compound containing the sample in its composition.

j; Using the ratio p calculated by the ratio calculation means e,
The input target amount W0 is measured as the target amount W0 of the sample.
Target amount conversion means to convert into.

k: A second display that displays the converted target weighing amount W0.

In the configuration shown in Figure 1, the display g does not directly display the mass W of the sample on the dish, but converts W to w=pW (5) using the ratio p. Display the quality i1w.

The ratio p is calculated using the atomic weight of each element stored in the storage means C, and is the first chemical composition (chemical composition of the sample).
is the ratio of the molecular weight (atomic weight) of the second chemical composition to p=Mz/M+...
... is represented by (6).

When the composition of the component of interest in the sample is input as the second chemical composition, p in equation (6) becomes equivalent to the second term on the right side of equation (1) in the mass measurement example described above, and
If the composition of the compound obtained by combining the sample with another substance is input as the chemical composition of , then p will be equivalent to the second term on the right side of equation (2).

In other words, by inputting the chemical composition of the sample and the chemical composition of the target substance whose mass you want to know before measurement, the quality 1w of the sample placed on the plate can be converted into the mass W of the target substance every moment. This is displayed on the display g, and the desired purpose can be achieved whether it is applied to measuring the mass of a target substance that does not exist or to quantitatively weighing the target substance.

In the configuration shown in FIG. 2, the first display directly displays the mass W of the sample on the dish.

On the other hand, on the second display k, the weighed target amount w0 of the target substance inputted from the target amount input means i is converted by the ratio p, W o = W (1/ p . . . (
7) The target amount W0 of the sample to be weighed is displayed.

When inputting the composition of the component of interest in the sample as the second chemical composition, l/p becomes equivalent to the second term on the right side of equation (3) above, and therefore, the measurement target IW6 of the component of interest is also input. By doing so, the quality of the sample required to obtain wo of the component of interest is displayed on the second display k.
wo will be displayed.

Also, if we input the composition of the compound obtained by combining the sample with another substance as the second chemical composition, 1/p is the same <
It is equivalent to the second term on the right side of equation (4), and if the target amount W0 of the substance after combination is inputted, the second display will show the amount required to obtain Wo of the substance after combination. The mass W0 of the sample will be displayed.

<Example> FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention.

The load detection unit 1 has a built-in load sensor that engages with the plate 1a and an A-D converter for digitizing the sensor output, and can output digital data corresponding to the load on the plate ia. .

This data from the load detection section 1 is input to the control section 2 at predetermined minute intervals.

The control unit 2 is mainly composed of a microcomputer including a CPU 21, a ROM 22, a RAM 23, etc., and includes a keyboard 3 equipped with numeric keys, alphanumeric keys, a mode switching key to be described later, etc., and a first and second display. devices 4 and 5 are connected.

In addition to programs to be described later, the ROM 22 stores an atomic weight table in which the atomic weights of all elements in the periodic table are written in correspondence with the respective element symbols.

In addition to the work area, the RAM 23 contains the load detection section 1.
An area is set for storing load data taken from , and an area for storing ratio p and sample weighing target amount Wo, etc., which will be described later.

For example, an area is set to store n pieces of data from the load sensor, and each time the latest data D is taken in, the oldest data D in the RAM 23 is stored.

is discarded, so that the RAM 23 always contains the latest n
The load data D1 to D, l will be stored.

FIG. 4 is a flowchart showing the contents of the program written in the ROM 22, and the operation will be described below with reference to this figure.

In this example, display mode A displays the mass of the target substance on the first display 4 by operating the keyboard 3;
Displaying the mass of the sample as is on the first display 4, and
Display mode B can be selected for the second display 5 to display the target amount of sample to be weighed.

Now, when display mode A is selected, information relating to the first and second chemical compositions is input from the keyboard 3.

Here, for example, if the existing sample is CaC1 and you want to find the mass of the component Ca, for example, (CA-CL
*2) etc., and enter the same < as the second chemical composition.
Enter (CA) etc.

With this input, Ca = 40.08. from the atomic weight table in the ROM 22. CI = 34.453 is retrieved and the molecular weight M of the substance with the first and second chemical composition
1 and M2 are M, = 40.08 + 34.453X 2 = 108.9
It is calculated as 86M, = 40.08. Then, the ratio p of M2 to Ml is calculated as p=Mz/M+=0.3678 and stored in the RAM 23.

When the sample, that is, CaC1□, is placed on the pan 1a in this state, the data from the load detection section 1 is stored moment by moment in the RAM 23 in the same way as a normal electronic balance, and the latest n pieces of data D, The mass W of the sample on the dish 1a is calculated moment by moment by averaging .about.D, , and multiplying by the span coefficient k. Then, the quality 1w is displayed on the first display after being converted into the mass W of the target substance, that is, Ca, using the ratio p. In other words, when the sample CaC1□ is placed on the plate 1a, the first display 4 shows "3.67".
8g" is displayed. Note that if the setting of the condition is changed by operating the keyboard 3, the ratio p in the RAM 23 is erased.

In this display mode A, on the other hand, if the current sample is Ca and you want to know the mass when this Ca combines with CI□ to become CaC1□, use the keyboard 3 as the first chemical composition (C , A) as the second chemical composition (C
All you have to do is input A-CL*2).

In this case, M, = 40.08, M, = 108.9
86, and p = 2.719. And plate 1
When Ca is placed on a, its mass W is calculated in the same way, and then converted to the mass W of Ca C12 by the ratio p,
It is displayed on the first display 4. For example, Ca on the plate 1a
When 10g of
9g” will be displayed.

Now, when display mode B is selected, the system waits for input of information regarding the first and second chemical compositions and the target IWO of the target substance from the keyboard 3.

As an example, if the existing sample is 1g of CaC and you want to measure the Log of the component Ca, enter (CA-CL*2) as the first chemical composition and (CA) as the second chemical composition. At the same time, the target amount of Ca to be measured Wo=10g is input.

Using this human power, M = 108.986, M2 = 40.08 were calculated in the same way, p = 0.3678 was obtained, and the target amount to be weighed Wo = 10g, Wo = wo / p = 1010.3678. =27.1
It is converted into 89g and stored in the RAM 23.

On the other hand, the mass W of the sample on the pan 1a is calculated using the average value of n load data and the span coefficient, etc., in the same way as with an ordinary electronic balance. At the same time, R is displayed on the second display 5.
Weighing target I after conversion stored in AM23
Wo=27.189g is displayed.

As a result, the operator controls the sample Ca C1! until the value displayed on the first display 4 matches the value displayed on the second display 5, that is, 27.189 g. By simply placing the sample on the plate 1a, the target substance Ca is weighed out in the target amount of 10 g. The display of Wo or Wo in the RAM 23 is erased when the setting of conditions is changed.

In addition, in this display mode B, the existing sample is Ca,
This Ca is combined with 1 g of C to give a desired amount, for example, 10 g of C.
When trying to obtain aClz, the first chemical composition is [Ca], and the second chemical composition is (Ca-CL*2
) It is sufficient to input 10 g as the target amount W0 to be weighed.

In this case, M+=40.08, M2=108.98
6, and p=27.19. Then, the second display 5 displays Wo=wo/p=3.678g, so the mass display value W on the first display 4
The objective can be achieved by placing the sample Ca on the plate 1a until it reaches 3.678 g.

In addition, in the above embodiment, it is necessary for the design to make the keyboard 3 a so-called alphanumeric keyboard that has both alphabetic keys and numeric keys, and to use periodic table keys instead of alphabetic keys. It is optional depending on the

Also, using the purity of the sample, the purity of the target substance, etc., the ratio p
A function for correcting can be easily added by adding a routine for inputting these values and a function for multiplying Ml and M2 by the input purity, respectively.

<Effects of the Invention> As explained above, according to the present invention, by inputting the chemical composition of the existing sample and the chemical composition of the target substance, or in addition, inputting the target amount of the target substance to be measured. By doing this, the ratio of the molecular weights of both is calculated based on the atomic weight of each element stored in advance, and by placing the sample on the dish, its mass is converted to the mass of the target substance using the above ratio and displayed. or,
The weighed target amount of the target substance is converted into the weighed target amount of the sample using the above ratio and is displayed together with the mass of the sample itself on the dish. It has become possible to quickly measure and weigh the mass of a target substance without conducting any investigation or calculation using these.

[Brief explanation of the drawing]

FIG. 1 is a basic conceptual diagram showing the first configuration of the present invention, FIG. 2 is a basic conceptual diagram showing the second configuration of the present invention, FIG. 3 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 4 is that ROM22
3 is a flowchart showing the contents of a program written in the .・Load detection unit ・Plate ・Control unit ・CPU ・ROM ・RAM ・Keyboard ・1st display ・2nd display

Claims (2)

[Claims] (1) In a balance equipped with a load detection section that outputs an electrical signal corresponding to the load on the pan, and a mass calculation means that calculates the mass of the sample on the pan based on the output from the load detection section; a storage means for storing the atomic weight of each element; information regarding the chemical composition of the sample to be placed on the dish (first chemical composition), and a component of interest contained in the sample or a composition containing the sample; Chemical composition of the target compound (second
a composition input means for inputting information relating to the chemical composition); and a composition input means for inputting information relating to the chemical composition of a ratio calculation means for calculating; a mass conversion means for converting the mass value of the sample on the dish calculated by the mass calculation means into a mass value of the substance having the second chemical composition using the ratio; An electronic balance comprising: a display for displaying a mass value; and; (2) In a balance equipped with a load detection section that outputs an electrical signal corresponding to the load on the pan, and a mass calculation means that calculates the mass of the sample on the pan based on the output from the load detection section; a first display for displaying the mass of the sample on the dish calculated by the mass calculation means; a storage means for storing each atomic weight of a plurality of elements; a chemical composition (first chemical composition) of the sample to be placed on the dish; ) and a composition input means for inputting information regarding the target component contained in the sample or the chemical composition (second chemical composition) of the target compound containing the sample in the composition; a target amount input means for inputting a measured target amount of a component or target compound; using the contents of the storage means, a molecular weight or atomic weight ratio of the second chemical composition to the input first chemical composition; a ratio calculation means for calculating; a target amount conversion means for converting the input target amount of the component of interest or target compound to be measured into a target amount of the sample using the calculated ratio; An electronic balance comprising: a second display for displaying a weighed target amount;