The Care Of The Analytical Balance
The care of the analytical balance begins with the verification of the conditions that may affect it. The training for its use, its periodic maintenance, the registration of daily events to avoid breakdowns. In short, they are the guarantee that it has good performance providing reliable, accurate, accurate weighing readings in the analysis or study.
💥What is an analytical balance and what is it for?
It is an apparatus with which measurements of the masses of a material, sample or substance are carried out. It requires the establishment of necessary conditions for its operation. Because in experimentation measurements with precision, accuracy are necessary. For the composition of a compound, substance.
That will be manufactured in the health area with great impact on the population. It consists of a cabin that protects it from environmental disturbances. It has a counterweight mechanism for the measured mass, an electromagnet that measures the force necessary to balance the balance. It is used to measure the weight of materials.
From 0.1 mg to 200 grams or from 0.001 to 200 grams. In the field of chemistry it serves because accuracy is needed for the constituents of a compound. To avoid unexpected reactions that affect the study, the laboratory and the scientist. Know the real measurements, with accurate results, so that optimal results are achieved.
It is used in water quality control to eliminate contaminants. In the preparation of mixtures with the defined proportions, the determination of specific densities and weights. It is applied in quantitative analytical chemistry because the results resemble reality. Very useful in the areas of chemistry, biology and scientific research.
💥How does an analytical balance work?
The care of the analytical balance impacts the operation of the device, obtaining optimal results. Based on the perfect exercise of its internal systems which are a photocell, an electromagnet, electromagnetic system, a saucer. That when placing the material to be weighed on the saucer, the photocell is activated for the detection of weight movements.
Causing the electromagnet to balance the force by the charge on the saucer. Which is interpreted for display on the electronic screen. Its purpose is to compare the known mass with the weight of the unknown substance. In addition there are other presentations of analytical balances such as the spring consisting in that the force exerted by the spring is proportional to its elasticity.
Sliding weights are movements that move on scales of two known masses, one macro and the other micro. Until the equilibrium position is reached, adding both readings according to the position on the scales. The two-plate one is constituted by a bar or lever supported in the form of blades.
The ends have two blades that oscillate where the plates are located, in one the dough is placed to known while in the other the unknown is put.
💥What is the sensitivity of the analytical balance?
The care of the analytical balance has to do with its sensitivity in such a way that the conditions that affect it must be minimized. It has an extraordinary sensitivity to any environmental factor, temperature, cold, heat, sunlight, humidity, air. To the steam, the dust, to the movement capable of capturing changes.
In every way reporting incorrect results due to their misalibration. The aspects generated by exposing it to temperature variations. In the chamber, air currents are generated that exert force on the saucer by modifying the weight. If the material is cold, it reports a higher weight, but if it is hot, lower weight data is obtained.
For the electrostatic presence, it indicates different masses for the same sample. The condition of magnetism, the same depends on the type of material despite the attraction of the metal to the saucer. Getting wrong results. The gravitational effect lies in the altitude of the site where the measurement is made.
💥The effect of the atmosphere
Atmospheric pressure, causes changes in the state of matter, a dehumidifier should be used. Due to all these considerations, standards have been issued for the measurement of masses in the analytical balance. Because it is designed to provide accurate, real, reliable data. All the basic conditions for its operation must be met.
Due to the extreme need for precision in the measurement carried out. The selection of the balance to be used in an analysis will depend on the activity to be executed. Whether the determination of the masses for the study are of small or large quantities.
💥How to calibrate a laboratory analytical balance?
The care of the analytical balance are processes that incorporate the calibration of the device. Which are carried out in parts, the first, begins with the considerations before performing the calibration. Which are to make sure the identification of the device (brand, series, model). Reading the balance instruction manual.
Checking the right place for the device, without vibrations or disturbances. The operation of the systems (mechanical. Electrical, optical). Of the surface state of the interior weighing area, its accessibility and its types. If around the scale is clean, clear.
The weight standards must remain at the calibration site as necessary for their stabilization minimum two hours. Second part, calibration procedure, it is performed on the weighing plate if necessary on the rest of the scale of the balance. It is carried out at five points on the scale by distributing them on it.
Making measurements at least five times at each point, keeping track of the values. To make the measurements, the repeated values are taken into account in the device or another that the specialist considers. In each measurement the standard weight is used or they are combined. The measurements are made at five different points of the plate in A, B, C, D, E, at each point five measurements.
There may be variability, difference in values. The correction calculation, the standard deviation is used to correct for each value, including the determination of the normal uncertainty. The repeated uncertainty, from of the pattern, the eccentric and the combined. Once the review and calculations are completed, the calibration certificate is issued.
💥Care of the analytical balance
The care of the analytical balance is the basis of good results issued by the apparatus for this several actions must be addressed. The first is the location of the analytical balance, which must be in a room, a room that has only one entrance. With few windows to prevent air from entering. Within the chosen place, the specific placement must comply with that it is on a site.
Where sunlight does not directly affect the balance. The temperature should be controlled between 45 ° C to 60 ° C. As for the support that will hold it, it must be rigid, made of cement, glued to the floor, fixed to the wall. Under the firm columnar structures of the building, without inclination. Free of magnetism and electrostatic factors.
In the counter where the scale is located, there should be no objects, electrical appliances, fans. The second is the basic care, constantly checking the calibration of the balance. Keep it on to take care of its thermal balance, in standby mode to avoid waiting for the heating time.
Tare the scale before use. Check if the display is set to zero before placing the bottle in the chamber. Use small measuring bottles, not plastic. Observe that both the bottle and the substances inside it are at room temperature to introduce it into the chamber. The measuring jar should be located in the center of the measuring plate.
Remove the bottle only when the measurement has been completed. The calibration of the device is carried out when it is installed for the first time, if it is placed in another place inside the room, after leveling, changes in temperature or atmospheric pressure.
The care of the analytical balance is recommended to prevent the breakdown of it, knowing about the maintenance will be reflected in longer time of use and even more so in obtaining the reliable, precise and accurate results that are needed in the study.
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