An analytical balance is a measuring instrument used to determine the mass of an object, it provides a high degree of precision in the order of 0.001 grams. Created in the year 1750 by the Scottish chemist Joseph Black, it is currently considered an important scientific instrument for providing data with great accuracy.
For its operation, it must be positioned under a specific environment and have controlled environmental conditions so that it does not suffer any alteration in the absolute value of the weighing.
Analytical balances deliver highly accurate measurements, as they employ an electronic system capable of measuring minute differences in mass. They are manufactured inside a transparent box provided with doors to isolate it from certain factors that may affect its operation. Therefore, due to the need for extreme precision of the measurements carried out, these must have specific rooms for their manipulation, with controlled environmental conditions, as well as observed with the conditions of the electrical network to supply voltage within the tolerance limits specified in the manual of each model.
Their use is very common and necessary in laboratories, as they are widely used to weigh ingredients in the manufacture of solutions, compounds, and drugs. It is recommended to calibrate them regularly, even more so when it is being operated for the first time, if it has been moved, after any leveling and after large variations in temperature or atmospheric pressure, modern analytical balances perform this function automatically. , when they detect any environmental variation.
According to its technology, there are basically two types of analytical balances
- Analog analytical balances: these are analytical balances based on mechanical measurement principles.
- Digital analytical balances: They use electronic means for the measurement and transmission of data related to the weight of an object. They work through an electromagnetic system with a photocell that detects the position of the plate and an electromagnet in charge of balancing the force exerted by the load on the plate. They measure forces, so they must be calibrated to adapt to the gravitational intensity in the place where the weighing is carried out.
What considerations should you take into account?
- For the proper functioning of the equipment and to have precise and exact results in the weighing of a sample, and that it does not affect the study of the project you are carrying out, it is important to:
- Have an environment that does not present drafts, sudden changes in temperature and is free of dust.
- Have a perfectly level counter. A high inertia platform, isolated from structures located in the vicinity, is ideal to reduce the effect of vibrations emitted by certain equipment such as centrifuges and refrigerators.
- Regarding the environmental conditions, the temperature of the room must be constant and the humidity must be between 45% and 60%, for that, it must be monitored whenever possible.
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