JPS61272630A - Measuring instrument for solid specific gravity - Google Patents

Abstract

PURPOSE:To prevent a bubble sticking to a sample or a sample pan automatically by constituting a cistern device to submerge the sample on the sample pan so as to measure the underwater weight of the sample after it is moved back and forth between in the air and under the water the prescribed number of times. CONSTITUTION:First, the measured data of the weight of the sample in the air are stored in a RAM 7c. Then, the movements of a ascent and descent of the cistern 4 are repeated three times to obtain the underwater weight data. Then, only in case the up-to-date data are of heavier value than the data just before, the next step is proceeded. In other words, after it is confirmed that there is no bubble in the underwater weight measurement, when the values of the three up-to-date data are within a preset range of variance, the up-to-date data are adopted as the measured value of the underwater weight and the specific gravity of the sample is calculated from the measured value with the weight data in the air with an arithmetic and control part 7. Then, its calculated value is displayed on a display device 8. In this way, the sticking of the bubble is prevented automatically and the reliability of the measured value is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for measuring the weight in air and weight in water of a sample, and determining the specific gravity of the sample from each of the measured values.

<Prior art> This type of specific gravity measuring device is generally equipped with an electronic balance with a sample plate suspended below, and a water tank device for submerging the sample on the sample plate. Except for the loading and unloading of the sample and the manual operations described below, the measurement operation is performed automatically in a fixed sequence according to the following steps. That is, the weight is measured in air, the sample is immersed in water by driving an aquarium, the weight is measured in water, and the specific gravity of the sample is calculated from the weight in air and the weight in water. When calculating this specific gravity, the specific gravity of water and the specific gravity of air are used.

Also, corrections are made for changes in the buoyancy force on the sample plate suspension due to the rise in the water level as the sample is immersed in the water.

<Problems to be Solved by the Invention> By the way, a major factor causing errors in the measured value of weight in water is air bubbles that adhere to the sample, sample plate, etc. when the sample is submerged in water. Not only is it impossible to correct the adhesion of bubbles during calculation, but it is also difficult to confirm the presence or absence of the adhesion from the outside.

Therefore, in conventional devices, after the measurement of weight in air is completed, the sample is taken out of the Ikkei device and immersed in a separately prepared water tank to improve the wettability of the sample and prevent air bubbles from adhering to it. This required manual labor.

The object of the present invention is to provide an I/O solid specific gravity measuring device that can automatically prevent air from adhering to a sample or sample dish when measuring weight in water without requiring two manual operations.
It is intended to serve as a food source.

Means for Solving the Problems> The present invention is characterized by configuring a water tank device for submerging the sample on the sample container so as to cause the sample to reciprocate between air and water a predetermined number of times. , after the reciprocation, the underwater weight measurement value is obtained.

<Operation> Before obtaining the measured value of the weight in water, the sample is moved back and forth between the air and the water using the water tank device, which removes air bubbles that adhere to the sample and the sample plate, and eliminates air bubbles.
Errors in underwater weight measurement due to wear are prevented.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. A sample dish 2a is suspended from an electronic balance 2 placed on the L side of the pedestal 1. A water tank 4 mounted on a water tank vertical drive device 3 is disposed below the sample dish 2a. The aquarium lower drive device 3 is driven by a motor drive circuit 5. By rotating the built-in motor, the water 41v4 can be displaced to one side or downward. The seventh drive circuit 5 is operated based on commands from the sequence controller 6.

The electronic balance 2 measures the load on the sample plate 2a-to, and outputs the digitally converted data when there is a command from the sequence control summer cola 6. This data is taken into the arithmetic control section 7.

The arithmetic control unit 7 is composed of a microcomputer, and includes a CPU 7 that executes programs and controls each peripheral device.
a, ROM 7b in which a program to be described later is written, and data from the electronic balance 2.

It is provided with a RAM 7C having an area for storing various calculation results etc. by the CPU 7a, and an input/output capo 74 for connection with external equipment, which are connected to each other by a pass line.

In addition to the electronic balance 2, the input/output capo 7d of the arithmetic control unit 7 includes a display 8 for displaying the specific gravity calculation results, and a printer 9 for printing the results. and a sequence controller 6 are connected.

The sequence controller 6 is controlled by the arithmetic control section 7, and is configured to generate command signals to each section according to a program written in the ROM 7b.

FIG. 2 is a flowchart showing a program written in the ROM 7b. The operation and effect of the embodiment of the present invention will be described below with reference to this diagram.

First, when initialization is performed by inputting measurement conditions such as water temperature and air temperature, the zero adjustment of the electronic balance 2 is performed. That shallow,
When the sample is placed on the sample plate 2a, measurement operations are automatically executed thereafter. First, measurement data W of the amount of M in the air of the sample is captured and stored in the RAM 7C. Next, the water tank 4 is raised twice to submerge the sample in water, and after collecting the first water M amount data W/1, the water tank 4 is lowered to expose the sample to the air again. Repeat this operation three times to obtain underwater weight data W' l , W' 2. Get W' 3. Among these, the latest data w'3 is the immediately preceding data W/2.
Proceed to the next step only if the value is heavier than . If W/3 is lighter than w'2, the water tank 4 is lowered and then raised again, further underwater weight data W'4 is collected, and a similar comparison is made. The fact that the latest underwater weight data W' is heavier than the immediately previous underwater weight data W'L-, means that air bubbles have been removed compared to when W'L-1 was collected, and it is necessary to confirm this. After that, then the latest three days') WA, W7; -1, Wi,
It is determined whether the value of -2 falls within a preset variation range. If it is not within the range, there is still a risk of air bubbles adhering, so the tank 4 is lowered and raised again to collect new data. The latest 311? If the variation between the data of il is within a predetermined range, it means that there is no longer any influence of air envelopment, and only in this case, the latest data W'L can be calculated as the underwater weight. The specific gravity of the sample is calculated from the measured value W' and the in-air weight data W. It goes without saying that at this time, corrections regarding the specific gravity of water and air, the water surface minus 1 minus the rise, etc. are performed as usual. The specific gravity calculated in this way is displayed on the display 8. At the same time, the water tank 4 is lowered to its original position, and the sample is removed with a shovel to complete the measurement.

It goes without saying that the number of data items used to determine the presence or absence of variation is limited to three, and in the above embodiment, the weight of the sample in water is measured each time the sample is submerged in water, and air bubbles ( After confirming that there was no effect of water damage, the latest data was adopted as the underwater weight measurement value.However, this confirmation is not necessarily necessary, and the aquarium 4 may be removed for a predetermined number of times. It may be configured such that the water is lowered according to the condition and the subsequent small amount of underwater data is adopted as the measured value.

As described above, according to the present invention, the sample is automatically moved back and forth between the air and the water a predetermined number of times before measuring the weight in water, so it is possible to In addition, it is possible to measure the coulometric value in water with high precision by preventing the adhesion of air bubbles and eliminating the need for manual work such as dipping the sample into a separate water tank during the measurement operation. As a result, you can always obtain efficient, reliable and crystalline specific gravity measurements.

[Brief explanation of the drawing]

FIG. 1 shows the configuration of the embodiment of the present invention [1] The 21st program shows the program 7 written in the ROM 7b.
'1-Chart. 1 mount 2 electronic balance 4-5 2a sample , 3 ? Tank 1: Station! Equipment No. 4 Water tank fi:', i-'), ♂n 11-4--17
/iii arithmetic control section

Claims (2)

[Claims] (1) In a device that has a water tank device for submerging a sample suspended in a weight measuring device, and determines the specific gravity of the sample from the measured weight of the sample in air and water, the water tank device is used to submerge the sample. What is claimed is: 1. A solid specific gravity measuring device, characterized in that it is configured to reciprocate between air and water a predetermined number of times, and to obtain a measured value of the weight in water after the reciprocation. (2) The underwater weight of the sample is measured each time during the above reciprocation, and the above reciprocation is continued until the measured value falls within a predetermined variation range for a preset number of consecutive times. A solid specific gravity measuring device according to claim 1.